mirror of
https://github.com/Michaelangel007/apple2_hgr_font_tutorial.git
synced 2024-11-16 11:04:49 +00:00
48 lines
1.7 KiB
HTML
48 lines
1.7 KiB
HTML
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<html>
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<head>
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</head>
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<body>
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<pre id="hexdump"></pre>
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<script>
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var hgr = [];
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for( var y = 0; y < 193; ++y ) // Intentional 1 scanline too many!
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hgr[ y ] = 0x2000 + ((y/64)|0)*0x28 + ((y%8)|0)*0x400 + ((y/8)&7)*0x80;
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for( var y = 0; y < 192; ++y )
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console.log( "[" + y + "]: " + hgr[y].toString(16).toUpperCase() );
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function byte2hex$( byte )
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{
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return ("0" + byte.toString(16)).toUpperCase().substr(-2)
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}
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var address = 0x1402, out = "";
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for( var y = 0; y < 192/8; ++y )
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for( var x = 0; x < 8; ++x )
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{
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var row = y*8 + x; // Assumes hgr[] has a dummy 193rd scanline!
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var src = hgr[ row + 1 ];
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var dst = hgr[ row + 0 ];
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var mem = "BD "
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+ byte2hex$( (src >> 0) & 0xFF ) + " "
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+ byte2hex$( (src >> 8) & 0xFF ) + " "
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+ "9D "
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+ byte2hex$( (dst >> 0) & 0xFF ) + " "
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+ byte2hex$( (dst >> 8) & 0xFF ) + " ";
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var txt = " "
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+ " LDA $" + src.toString(16).toUpperCase() + ",Y "
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+ ": STA $" + dst.toString(16).toUpperCase() + ",Y "
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+ " ; [" + (" " + (row+1)).substr(-3)
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+ "] -> [" + (" " + (row )).substr(-3) + "]" + "\n";
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if (row != 191)
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out += address.toString(16).toUpperCase() + ":" + mem + txt;
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address += 6; // 6 bytes per line
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}
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console.log( out );
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var pre = document.getElementById( "hexdump" );
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pre.innerHTML = out;
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</script>
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</body>
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</html>
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