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80 lines
2.8 KiB
HTML
80 lines
2.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
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<head>
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<title>xasm</title>
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<meta name="Description" content="xasm is a 6502 cross-assembler for DOS/Windows."/>
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<meta name="Keywords" content="xasm,6502,cross-assembler,atari"/>
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<meta name="Author" content="Piotr Fusik"/>
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</head>
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<body style="background-color: #c0ffc0">
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<h1>xasm.atari.org</h1>
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<p><b>xasm</b> is a 6502 cross-assembler for DOS/Windows.
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It is mainly targeted at Atari 8-bit computers,
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but it can be also used for programming
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Atari 2600/5200/Lynx, Commodore C64, Apple ][ and others.
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<b>xasm</b> is freeware.</p>
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<p><a href="xasm260.zip">Download version 2.6.0
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(22 KB, includes full documentation)</a></p>
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<p><b>xasm</b> no longer includes the tools X-BOOT, X-LOAD and X-HEAD.
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If you really need them,
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<a href="xasm252.zip">download version 2.5.2 (38 KB)</a>.</p>
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<h3>Target audience</h3>
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<p><b>xasm</b> is for people who are fluent in the 6502 assembly language.
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There is no sample code for beginners, no easy-to-use libraries.
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You are warned that programming 8-bit machines in the assembly language
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is a tedious work.</p>
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<p>There are several 6502 cross-assemblers to choose from and new ones
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still appear. Just search the web. Make sure to not overlook
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the <a href="http://www.cc65.org">cc65</a> compiler which includes
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a cross-assembler, portable across many host and target platforms.</p>
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<h3>Features</h3>
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<p>Although <b>xasm</b> does not support user-defined macros, it has a rich
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set of built-in facilities.</p>
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<p>Here is some typical 6502 code (also valid in <b>xasm</b>):</p>
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<pre>
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lda #<dest
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sta ptr
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lda #>dest
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sta ptr+1
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ldx #192
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do_line
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ldy #39
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do_byte
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lda pattern,y
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sta (ptr),y
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dey
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bpl do_byte
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lda #40
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clc
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adc ptr
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sta ptr
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bcc skip
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inc ptr+1
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skip
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dex
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bne do_line
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</pre>
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<p>And here is the same code rewritten in a xasm-specific way:</p>
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<pre>
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mwa #dest ptr
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ldx #192
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do_line
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ldy #39
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mva:rpl pattern,y (ptr),y-
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lda #40
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add:sta ptr
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scc:inc ptr+1
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dex:bne do_line
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</pre>
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<h3>Usage</h3>
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<p>Although <b>xasm</b> comes with no editor, the documentation
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describes integration (syntax highlighting and single-keystroke compilation)
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with a few general-purpose text editors. Here is a screenshot
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of the <a href="http://www.code-genie.com">Code-Genie</a> editor:</p>
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<p><img src="cgenie.gif" alt="6502 code in Code-Genie"/></p>
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<hr/>
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<p><i>Hosted by <a href="http://atariarea.histeria.pl">Atari Area</a></i></p>
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</body>
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</html>
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