977 lines
33 KiB
HTML
977 lines
33 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
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"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
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<head>
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<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
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<meta name="generator" content="AsciiDoc 8.6.9" />
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<title>Extracting music from the Xmas demo</title>
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<style type="text/css">
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/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
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/* Default font. */
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body {
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font-family: Georgia,serif;
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}
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/* Title font. */
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h1, h2, h3, h4, h5, h6,
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div.title, caption.title,
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thead, p.table.header,
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#toctitle,
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#author, #revnumber, #revdate, #revremark,
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#footer {
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font-family: Arial,Helvetica,sans-serif;
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}
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body {
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margin: 1em 5% 1em 5%;
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}
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a {
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color: blue;
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text-decoration: underline;
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}
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a:visited {
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color: fuchsia;
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}
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em {
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font-style: italic;
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color: navy;
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}
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strong {
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font-weight: bold;
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color: #083194;
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}
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h1, h2, h3, h4, h5, h6 {
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color: #527bbd;
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margin-top: 1.2em;
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margin-bottom: 0.5em;
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line-height: 1.3;
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}
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h1, h2, h3 {
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border-bottom: 2px solid silver;
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}
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h2 {
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padding-top: 0.5em;
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}
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h3 {
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float: left;
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}
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h3 + * {
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clear: left;
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}
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h5 {
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font-size: 1.0em;
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}
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div.sectionbody {
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margin-left: 0;
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}
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hr {
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border: 1px solid silver;
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}
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p {
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margin-top: 0.5em;
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margin-bottom: 0.5em;
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}
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ul, ol, li > p {
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margin-top: 0;
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}
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ul > li { color: #aaa; }
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ul > li > * { color: black; }
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.monospaced, code, pre {
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font-family: "Courier New", Courier, monospace;
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font-size: inherit;
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color: navy;
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padding: 0;
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margin: 0;
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}
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pre {
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white-space: pre-wrap;
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}
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#author {
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color: #527bbd;
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font-weight: bold;
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font-size: 1.1em;
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}
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#email {
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}
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#revnumber, #revdate, #revremark {
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}
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#footer {
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font-size: small;
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border-top: 2px solid silver;
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padding-top: 0.5em;
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margin-top: 4.0em;
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}
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#footer-text {
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float: left;
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padding-bottom: 0.5em;
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}
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#footer-badges {
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float: right;
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padding-bottom: 0.5em;
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}
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#preamble {
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margin-top: 1.5em;
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margin-bottom: 1.5em;
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}
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div.imageblock, div.exampleblock, div.verseblock,
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div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
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div.admonitionblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.admonitionblock {
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margin-top: 2.0em;
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margin-bottom: 2.0em;
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margin-right: 10%;
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color: #606060;
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}
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div.content { /* Block element content. */
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padding: 0;
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}
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/* Block element titles. */
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div.title, caption.title {
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color: #527bbd;
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font-weight: bold;
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text-align: left;
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margin-top: 1.0em;
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margin-bottom: 0.5em;
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}
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div.title + * {
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margin-top: 0;
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}
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td div.title:first-child {
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margin-top: 0.0em;
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}
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div.content div.title:first-child {
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margin-top: 0.0em;
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}
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div.content + div.title {
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margin-top: 0.0em;
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}
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div.sidebarblock > div.content {
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background: #ffffee;
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border: 1px solid #dddddd;
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border-left: 4px solid #f0f0f0;
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padding: 0.5em;
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}
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div.listingblock > div.content {
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border: 1px solid #dddddd;
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border-left: 5px solid #f0f0f0;
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background: #f8f8f8;
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padding: 0.5em;
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}
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div.quoteblock, div.verseblock {
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padding-left: 1.0em;
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margin-left: 1.0em;
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margin-right: 10%;
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border-left: 5px solid #f0f0f0;
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color: #888;
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}
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div.quoteblock > div.attribution {
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padding-top: 0.5em;
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text-align: right;
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}
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div.verseblock > pre.content {
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font-family: inherit;
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font-size: inherit;
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}
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div.verseblock > div.attribution {
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padding-top: 0.75em;
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text-align: left;
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}
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/* DEPRECATED: Pre version 8.2.7 verse style literal block. */
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div.verseblock + div.attribution {
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text-align: left;
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}
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div.admonitionblock .icon {
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vertical-align: top;
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font-size: 1.1em;
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font-weight: bold;
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text-decoration: underline;
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color: #527bbd;
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padding-right: 0.5em;
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}
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div.admonitionblock td.content {
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padding-left: 0.5em;
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border-left: 3px solid #dddddd;
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}
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div.exampleblock > div.content {
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border-left: 3px solid #dddddd;
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padding-left: 0.5em;
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}
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div.imageblock div.content { padding-left: 0; }
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span.image img { border-style: none; vertical-align: text-bottom; }
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a.image:visited { color: white; }
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dl {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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dt {
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margin-top: 0.5em;
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margin-bottom: 0;
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font-style: normal;
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color: navy;
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}
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dd > *:first-child {
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margin-top: 0.1em;
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}
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ul, ol {
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list-style-position: outside;
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}
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ol.arabic {
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list-style-type: decimal;
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}
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ol.loweralpha {
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list-style-type: lower-alpha;
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}
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ol.upperalpha {
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list-style-type: upper-alpha;
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}
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ol.lowerroman {
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list-style-type: lower-roman;
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}
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ol.upperroman {
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list-style-type: upper-roman;
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}
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div.compact ul, div.compact ol,
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div.compact p, div.compact p,
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div.compact div, div.compact div {
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margin-top: 0.1em;
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margin-bottom: 0.1em;
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}
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tfoot {
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font-weight: bold;
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}
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td > div.verse {
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white-space: pre;
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}
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div.hdlist {
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margin-top: 0.8em;
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margin-bottom: 0.8em;
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}
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div.hdlist tr {
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padding-bottom: 15px;
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}
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dt.hdlist1.strong, td.hdlist1.strong {
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font-weight: bold;
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}
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td.hdlist1 {
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vertical-align: top;
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font-style: normal;
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padding-right: 0.8em;
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color: navy;
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}
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td.hdlist2 {
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vertical-align: top;
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}
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div.hdlist.compact tr {
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margin: 0;
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padding-bottom: 0;
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}
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.comment {
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background: yellow;
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}
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.footnote, .footnoteref {
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font-size: 0.8em;
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}
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span.footnote, span.footnoteref {
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vertical-align: super;
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}
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#footnotes {
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margin: 20px 0 20px 0;
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padding: 7px 0 0 0;
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}
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#footnotes div.footnote {
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margin: 0 0 5px 0;
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}
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#footnotes hr {
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border: none;
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border-top: 1px solid silver;
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height: 1px;
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text-align: left;
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margin-left: 0;
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width: 20%;
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min-width: 100px;
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}
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div.colist td {
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padding-right: 0.5em;
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padding-bottom: 0.3em;
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vertical-align: top;
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}
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div.colist td img {
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margin-top: 0.3em;
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}
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@media print {
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#footer-badges { display: none; }
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}
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#toc {
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margin-bottom: 2.5em;
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}
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#toctitle {
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color: #527bbd;
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font-size: 1.1em;
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font-weight: bold;
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margin-top: 1.0em;
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margin-bottom: 0.1em;
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}
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div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
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margin-top: 0;
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margin-bottom: 0;
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}
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div.toclevel2 {
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margin-left: 2em;
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font-size: 0.9em;
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}
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div.toclevel3 {
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margin-left: 4em;
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font-size: 0.9em;
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}
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div.toclevel4 {
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margin-left: 6em;
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font-size: 0.9em;
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}
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span.aqua { color: aqua; }
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span.black { color: black; }
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span.blue { color: blue; }
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span.fuchsia { color: fuchsia; }
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span.gray { color: gray; }
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span.green { color: green; }
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span.lime { color: lime; }
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span.maroon { color: maroon; }
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span.navy { color: navy; }
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span.olive { color: olive; }
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span.purple { color: purple; }
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span.red { color: red; }
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span.silver { color: silver; }
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span.teal { color: teal; }
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span.white { color: white; }
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span.yellow { color: yellow; }
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span.aqua-background { background: aqua; }
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span.black-background { background: black; }
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span.blue-background { background: blue; }
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span.fuchsia-background { background: fuchsia; }
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span.gray-background { background: gray; }
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span.green-background { background: green; }
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span.lime-background { background: lime; }
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span.maroon-background { background: maroon; }
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span.navy-background { background: navy; }
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span.olive-background { background: olive; }
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span.purple-background { background: purple; }
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span.red-background { background: red; }
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span.silver-background { background: silver; }
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span.teal-background { background: teal; }
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span.white-background { background: white; }
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span.yellow-background { background: yellow; }
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span.big { font-size: 2em; }
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span.small { font-size: 0.6em; }
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span.underline { text-decoration: underline; }
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span.overline { text-decoration: overline; }
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span.line-through { text-decoration: line-through; }
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div.unbreakable { page-break-inside: avoid; }
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/*
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* xhtml11 specific
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*
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* */
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div.tableblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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div.tableblock > table {
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border: 3px solid #527bbd;
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}
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thead, p.table.header {
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font-weight: bold;
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color: #527bbd;
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}
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p.table {
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margin-top: 0;
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}
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/* Because the table frame attribute is overriden by CSS in most browsers. */
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div.tableblock > table[frame="void"] {
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border-style: none;
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}
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div.tableblock > table[frame="hsides"] {
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border-left-style: none;
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border-right-style: none;
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}
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div.tableblock > table[frame="vsides"] {
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border-top-style: none;
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border-bottom-style: none;
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}
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/*
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* html5 specific
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*
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* */
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table.tableblock {
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margin-top: 1.0em;
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margin-bottom: 1.5em;
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}
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thead, p.tableblock.header {
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font-weight: bold;
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color: #527bbd;
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}
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p.tableblock {
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margin-top: 0;
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}
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table.tableblock {
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border-width: 3px;
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border-spacing: 0px;
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border-style: solid;
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border-color: #527bbd;
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border-collapse: collapse;
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}
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th.tableblock, td.tableblock {
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border-width: 1px;
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padding: 4px;
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border-style: solid;
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border-color: #527bbd;
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}
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table.tableblock.frame-topbot {
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border-left-style: hidden;
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border-right-style: hidden;
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}
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table.tableblock.frame-sides {
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border-top-style: hidden;
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border-bottom-style: hidden;
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}
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table.tableblock.frame-none {
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border-style: hidden;
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}
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th.tableblock.halign-left, td.tableblock.halign-left {
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text-align: left;
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}
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th.tableblock.halign-center, td.tableblock.halign-center {
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text-align: center;
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}
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th.tableblock.halign-right, td.tableblock.halign-right {
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text-align: right;
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}
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|
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th.tableblock.valign-top, td.tableblock.valign-top {
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vertical-align: top;
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}
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|
th.tableblock.valign-middle, td.tableblock.valign-middle {
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vertical-align: middle;
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}
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|
th.tableblock.valign-bottom, td.tableblock.valign-bottom {
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vertical-align: bottom;
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}
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|
|
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|
/*
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* manpage specific
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|
*
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* */
|
|
|
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body.manpage h1 {
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padding-top: 0.5em;
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padding-bottom: 0.5em;
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border-top: 2px solid silver;
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border-bottom: 2px solid silver;
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}
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|
body.manpage h2 {
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border-style: none;
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}
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body.manpage div.sectionbody {
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margin-left: 3em;
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}
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|
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@media print {
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|
body.manpage div#toc { display: none; }
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}
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|
|
|
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</style>
|
|
<script type="text/javascript">
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|
/*<+'])');
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// Function that scans the DOM tree for header elements (the DOM2
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|
// nodeIterator API would be a better technique but not supported by all
|
|
// browsers).
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|
var iterate = function (el) {
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|
for (var i = el.firstChild; i != null; i = i.nextSibling) {
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|
if (i.nodeType == 1 /* Node.ELEMENT_NODE */) {
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|
var mo = re.exec(i.tagName);
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|
if (mo && (i.getAttribute("class") || i.getAttribute("className")) != "float") {
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result[result.length] = new TocEntry(i, getText(i), mo[1]-1);
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}
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iterate(i);
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}
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|
}
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|
}
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|
iterate(el);
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return result;
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}
|
|
|
|
var toc = document.getElementById("toc");
|
|
if (!toc) {
|
|
return;
|
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}
|
|
|
|
// Delete existing TOC entries in case we're reloading the TOC.
|
|
var tocEntriesToRemove = [];
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var i;
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for (i = 0; i < toc.childNodes.length; i++) {
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var entry = toc.childNodes[i];
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|
if (entry.nodeName.toLowerCase() == 'div'
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&& entry.getAttribute("class")
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&& entry.getAttribute("class").match(/^toclevel/))
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tocEntriesToRemove.push(entry);
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}
|
|
for (i = 0; i < tocEntriesToRemove.length; i++) {
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toc.removeChild(tocEntriesToRemove[i]);
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}
|
|
|
|
// Rebuild TOC entries.
|
|
var entries = tocEntries(document.getElementById("content"), toclevels);
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|
for (var i = 0; i < entries.length; ++i) {
|
|
var entry = entries[i];
|
|
if (entry.element.id == "")
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|
entry.element.id = "_toc_" + i;
|
|
var a = document.createElement("a");
|
|
a.href = "#" + entry.element.id;
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// Footnotes generator
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/////////////////////////////////////////////////////////////////////
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/* Based on footnote generation code from:
|
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* http://www.brandspankingnew.net/archive/2005/07/format_footnote.html
|
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*/
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footnotes: function () {
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// Delete existing footnote entries in case we're reloading the footnodes.
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// Use [\s\S] in place of . so multi-line matches work.
|
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// Because JavaScript has no s (dotall) regex flag.
|
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note = spans[i].innerHTML.match(/\s*\[([\s\S]*)]\s*/)[1];
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spans[i].innerHTML =
|
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"[<a id='_footnoteref_" + n + "' href='#_footnote_" + n +
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"' title='View footnote' class='footnote'>" + n + "</a>]";
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spans[i].setAttribute("data-note", note);
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noteholder.innerHTML +=
|
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if (id != null) refs["#"+id] = n;
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// Process footnoterefs.
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|
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"[<a href='#_footnote_" + n +
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"' title='View footnote' class='footnote'>" + n + "</a>]";
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var timerId;
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function reinstall() {
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asciidoc.footnotes();
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asciidoc.toc(toclevels);
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window.onload = reinstallAndRemoveTimer;
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asciidoc.install();
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/*]]>*/
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</script>
|
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</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>Extracting music from the Xmas demo</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div id="preamble">
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>This is very similar to the documentation on extracting music from Modulae.
|
|
The steps are a little more involved since the Xmas demo is a multi-part
|
|
demo, where the code and music for each part is loaded from disk separately.</p></div>
|
|
<div class="paragraph"><p>As with Modulae, we’ll start with extracting the initial boot loader.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/disasm xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">800</span> <span style="color: #993399">0</span> <span style="color: #993399">1</span> <span style="color: #990000">></span> boot<span style="color: #990000">.</span>s</tt></pre></div></div>
|
|
<div class="paragraph"><p>This time, the loading starts at <code>$08e3</code>. It loads blocks 7—17 into
|
|
RAM starting at <code>$9000</code> and then calls the decrunch routine at <code>$0a00</code>.</p></div>
|
|
<div class="paragraph"><p>We’ll do the same to extract the main loader.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">7</span> <span style="color: #993399">11</span> loader
|
|
<span style="color: #990000">.</span>/disasm loader <span style="color: #993399">9000</span> <span style="color: #990000">></span> loader<span style="color: #990000">.</span>s</tt></pre></div></div>
|
|
<div class="paragraph"><p>Again, we track down the loading routine. This time, it’s a function
|
|
located at <code>$9c3f</code>. It gets called multiple times, to load the different
|
|
parts of the demo. The <code>A</code> register holds the address of the table to use
|
|
when loading.</p></div>
|
|
<div class="paragraph"><p>The first time the loader is called, it uses the table at <code>$9ac3</code>. This
|
|
table only contains the loading screen graphics. So we’ll ignore it.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_loading_8230_music">Loading… Music</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The second time the loader is called, it uses the table at <code>$9ad5</code>.
|
|
We’ll extract the table offsets as we did in the Modulae example. Using
|
|
the relative address of the table from the start of the loader file.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/dumptbl loader ad5</tt></pre></div></div>
|
|
<div class="paragraph"><p>We can see a huge chunk of data that is loaded into <code>$e:9000</code>. We’ll
|
|
go ahead and disassemble it and look for the music player.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">47</span> <span style="color: #993399">92</span> loading
|
|
<span style="color: #990000">.</span>/disasm loading e9000 <span style="color: #990000">></span> loading<span style="color: #990000">.</span>s</tt></pre></div></div>
|
|
<div class="paragraph"><p>Most of the loading disassembly is actually noise because we disassembled
|
|
data.. but we know from the loader that after this block of data is loaded
|
|
and decrunched, it calls <code>$f:f000</code>. We can use that to follow the code
|
|
flow and inspect the music player.</p></div>
|
|
<div class="paragraph"><p>We see that the music player is slightly different from the standard
|
|
soundsmith music player. The timer runs on the last channel instead of the
|
|
first channel, and the tempo sets the timer frequency based on a lookup
|
|
table. Neither of things really matter, they’re just used to lighten the CPU
|
|
load a bit.</p></div>
|
|
<div class="paragraph"><p>We discover the music starts at <code>$e:9000</code> and the wavebank starts at <code>$e:e700</code>.
|
|
We’ll use the trim functions to extract the data into separate files.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/trimmusic loading <span style="color: #993399">0</span> loading<span style="color: #990000">.</span>song
|
|
<span style="color: #990000">.</span>/trimwb loading <span style="color: #993399">5700</span> loading<span style="color: #990000">.</span>wb</tt></pre></div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_main_menu_music">Main Menu Music</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The next time the loader is called, it uses the table at <code>$9ae7</code>.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/dumptbl loader ae7</tt></pre></div></div>
|
|
<div class="paragraph"><p>We hunt for the music player, and discover it. We also discover that
|
|
the music and wavebank are again combined into a giant block of data.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">139</span> <span style="color: #993399">122</span> main
|
|
<span style="color: #990000">.</span>/trimmusic main <span style="color: #993399">0</span> main<span style="color: #990000">.</span>song
|
|
<span style="color: #990000">.</span>/trimwb main <span style="color: #993399">9600</span> main<span style="color: #990000">.</span>wb</tt></pre></div></div>
|
|
<div class="paragraph"><p>After the main menu, the different parts of the demo are selectable by the
|
|
user. Making a selection causes the loader to load a unique table which
|
|
contains the graphics and the music and a different music player.</p></div>
|
|
<div class="paragraph"><p>The process is pretty much the same for each section. We look at the
|
|
table, we track down the music player, we use that to determine where
|
|
the music and wavetables are.</p></div>
|
|
<div class="paragraph"><p>I’ll just summarize each section from here-on out since the process is the
|
|
same for each. I will include the dumptbl command for each, though,
|
|
so you can see the block table for each section.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_section_1_music">Section 1 Music</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The music and wavebanks are combined again, and loaded into <code>$7:0000</code>.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/dumptbl loader b09
|
|
<span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">393</span> <span style="color: #993399">135</span> section1
|
|
<span style="color: #990000">.</span>/trimmusic section1 <span style="color: #993399">0</span> section1<span style="color: #990000">.</span>song
|
|
<span style="color: #990000">.</span>/trimwb section1 a000 section1<span style="color: #990000">.</span>wb</tt></pre></div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_section_2_music">Section 2 Music</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The music is loaded into <code>$5:0000</code>, the wavebank is loaded into <code>$3:0000</code>
|
|
and not crunched.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/dumptbl loader b4d
|
|
<span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">682</span> <span style="color: #993399">67</span> section2<span style="color: #990000">.</span>song
|
|
<span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">749</span> <span style="color: #993399">131</span> section2<span style="color: #990000">.</span>wb raw</tt></pre></div></div>
|
|
<div class="paragraph"><p>You can pass the song and wavebank back through the trim functions to
|
|
trim off the padding.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_section_3_music">Section 3 Music</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The music and wavebank are combined again, and loaded into <code>$c:0000</code>.
|
|
The music doesn’t sound quite right, so I’m thinking it may be patched
|
|
elsewhere.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/dumptbl loader b2b
|
|
<span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">538</span> <span style="color: #993399">114</span> section3
|
|
<span style="color: #990000">.</span>/trimmusic section3 <span style="color: #993399">0</span> section3<span style="color: #990000">.</span>song
|
|
<span style="color: #990000">.</span>/trimwb section3 <span style="color: #993399">8200</span> section3<span style="color: #990000">.</span>wb</tt></pre></div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_section_4_music">Section 4 Music</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The music and wavebank are combined again, loaded into <code>$7:0000</code>.
|
|
The loader hot-patches the music just after loading it. It sets the word at
|
|
<code>$7:0006</code> to <code>$3b80</code>. This sets the size of each block to <code>$3b80</code>, where
|
|
it was previously <code>$3b00</code>. We’ll go ahead and duplicate that patch in
|
|
our extract process.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/dumptbl loader b7f
|
|
<span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">915</span> <span style="color: #993399">127</span> section4
|
|
<span style="font-weight: bold"><span style="color: #0000FF">printf</span></span> <span style="color: #FF0000">'</span><span style="color: #CC33CC">\x</span><span style="color: #FF0000">80</span><span style="color: #CC33CC">\x</span><span style="color: #FF0000">3b'</span> <span style="color: #990000">|</span> dd <span style="color: #009900">of</span><span style="color: #990000">=</span>section4 <span style="color: #009900">bs</span><span style="color: #990000">=</span><span style="color: #993399">1</span> <span style="color: #009900">seek</span><span style="color: #990000">=</span><span style="color: #993399">6</span> <span style="color: #009900">count</span><span style="color: #990000">=</span><span style="color: #993399">2</span> <span style="color: #009900">conv</span><span style="color: #990000">=</span>notrunc
|
|
<span style="color: #990000">.</span>/trimmusic section4 <span style="color: #993399">0</span> section4<span style="color: #990000">.</span>song
|
|
<span style="color: #990000">.</span>/trimwb section4 b600 section4<span style="color: #990000">.</span>wb</tt></pre></div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_section_5_music">Section 5 Music</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>Section 5 doesn’t have any music. This is a very strange section too, since
|
|
it does two different things depending on whether or not you have the 3rd
|
|
joystick button held when it launches. Easter egg?</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_section_6_music">Section 6 Music</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>Section 6 also is missing music, but it does have a sound effect that
|
|
is loaded into <code>$3:0000</code>.</p></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_section_7_music">Section 7 Music</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>The music is loaded into <code>$4:0000</code> along with the demo code. The wavebank
|
|
is loaded into <code>$3:0000</code>. Unfortunately, the wavebank is incomplete for
|
|
some reason, making this music unplayable. I haven’t figured out how the
|
|
demo patches the wavebank.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/dumptbl loader bbb
|
|
<span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">1078</span> <span style="color: #993399">103</span> section7
|
|
<span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">1181</span> <span style="color: #993399">56</span> section7<span style="color: #990000">.</span>wb raw
|
|
<span style="color: #990000">.</span>/trimmusic section7 <span style="color: #993399">10000</span> section7<span style="color: #990000">.</span>song</tt></pre></div></div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_section_8_music">Section 8 Music</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph"><p>This one is tricky. It first loads the table at <code>$9c1b</code>, which loads
|
|
uncrunched data into <code>$2000</code>. It then loads the table at <code>$9c2d</code> which
|
|
loads more uncrunched data into <code>$3:0000</code>. It then takes <code>$100</code> bytes from
|
|
<code>$2010</code> and appends them onto the end of the data at <code>$3:0000</code>. Finally, it
|
|
uncrunches the data at <code>$3:0000</code>. So we’ll have to do this patch as well.</p></div>
|
|
<div class="listingblock">
|
|
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
|
|
by Lorenzo Bettini
|
|
http://www.lorenzobettini.it
|
|
http://www.gnu.org/software/src-highlite -->
|
|
<pre><tt><span style="color: #990000">.</span>/dumptbl loader c1b
|
|
<span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">24</span> <span style="color: #993399">16</span> patch raw
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<span style="color: #990000">.</span>/dumptbl loader c2d
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<span style="color: #990000">.</span>/decrunch xmasdemo<span style="color: #990000">.</span>2mg <span style="color: #993399">1487</span> <span style="color: #993399">113</span> crunched raw
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dd <span style="font-weight: bold"><span style="color: #0000FF">if</span></span><span style="color: #990000">=</span>patch <span style="color: #009900">of</span><span style="color: #990000">=</span>crunched <span style="color: #009900">skip</span><span style="color: #990000">=</span><span style="color: #993399">16</span> <span style="color: #009900">bs</span><span style="color: #990000">=</span><span style="color: #993399">1</span> <span style="color: #009900">count</span><span style="color: #990000">=</span><span style="color: #993399">256</span> <span style="color: #009900">oflag</span><span style="color: #990000">=</span>append <span style="color: #009900">conv</span><span style="color: #990000">=</span>notrunc
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<span style="color: #990000">.</span>/decrunch crunched <span style="color: #993399">0</span> <span style="color: #993399">0</span> section8
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<span style="color: #990000">.</span>/trimmusic section8 <span style="color: #993399">1000</span> section8<span style="color: #990000">.</span>song
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<span style="color: #990000">.</span>/trimwb seciton8 <span style="color: #993399">7000</span> section8<span style="color: #990000">.</span>wb</tt></pre></div></div>
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<div class="paragraph"><p>And that’s all the music in the xmas demo that I can find.</p></div>
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</div>
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<div id="footnotes"><hr /></div>
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Last updated
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2017-08-21 11:09:12 MST
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