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https://github.com/Michaelangel007/apple2_hgr_packer.git
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Add packer/unpacker
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Michaelangel007
commit
4cb6e13761
36
cmd_pack_unpack.c
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36
cmd_pack_unpack.c
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#include <stdio.h>
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void cmd_pack_unpack()
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{
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int src;
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int dst;
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printf( "=== Pack ===\n" );
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src = 0x2000;
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dst = 0x4000;
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while( src < 0x4000 )
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{
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// printf( "$%04X .. $%04X -> $%04X\n", src, src+0x77, dst );
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printf( "%04X<%04X.%04XM\n", dst, src, src+0x77 );
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src += 0x80;
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dst += 0x78;
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}
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printf( "=== Pack ===\n" );
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src = 0x4000;
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dst = 0x2000;
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while( src < 0x5E00 )
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{
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// printf( "$04X\n", src );
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printf( "%04X<%04X.%04XM\n", dst, src, src+0x77 );
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src += 0x80;
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dst += 0x78;
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}
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}
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int main()
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{
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cmd_pack_unpack();
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return 0;
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}
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BIN
pack_unpack
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BIN
pack_unpack
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Binary file not shown.
238
pack_unpack.s
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238
pack_unpack.s
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; Michael Pohoreski
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; github
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; HGR Packer/Unpacker by removing/adding HGR screen holes
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; Pack 8,192 bytes down to 8,192-512 = 7,680 = 30 sectors instead of 34 sectors
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; Remove the "screen holes" by "sliding" remaining memory down over them
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; Basically a glorified memcpy()
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;
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; Binary
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; ======
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; CALL-151
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; 0300:A9 20 A2 40 85 FB A0 FE
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; 0308:D0 08 A9 40 A2 20 86 FB
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; 0310:A0 FC 8C 3D 03 8C 41 03
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; 0318:C8 8C 45 03 A0 00 84 FE
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; 0320:85 FF 84 FC 86 FD A2 78
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; 0328:B1 FE 91 FC E6 FE D0 02
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; 0330:E6 FF E6 FC D0 02 E6 FD
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; 0338:CA D0 ED 18 A5 FE 69 08
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; 0340:85 FE D0 E2 E6 FF C6 FB
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; 0348:D0 DC 60
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; BSAVE HGR_PACK_UPACK,A$300,L$4B
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;
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; Usage
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; =====
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; BLOAD PIC,A$2000
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; CALL 768:REM $300
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; BSAVE PIC.PACK,A$4000,L$1E00
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; CALL 778:REM $30A
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; BSAVE PIC.HGR,A$2000,L$2000
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;
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; Pack - Monitor Commands
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; =======================
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; 4000<2000.2077M
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; 4078<2080.20F7M
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; 40F0<2100.2177M
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; 4168<2180.21F7M
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; 41E0<2200.2277M
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; 4258<2280.22F7M
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; 42D0<2300.2377M
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; 4348<2380.23F7M
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; 43C0<2400.2477M
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; 4438<2480.24F7M
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; 44B0<2500.2577M
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; 4528<2580.25F7M
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; 45A0<2600.2677M
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; 4618<2680.26F7M
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; 4690<2700.2777M
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; 4708<2780.27F7M
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; 4780<2800.2877M
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; 47F8<2880.28F7M
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; 4870<2900.2977M
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; 48E8<2980.29F7M
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; 4960<2A00.2A77M
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; 49D8<2A80.2AF7M
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; 4A50<2B00.2B77M
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; 4AC8<2B80.2BF7M
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; 4B40<2C00.2C77M
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; 4BB8<2C80.2CF7M
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; 4C30<2D00.2D77M
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; 4CA8<2D80.2DF7M
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; 4D20<2E00.2E77M
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; 4D98<2E80.2EF7M
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; 4E10<2F00.2F77M
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; 4E88<2F80.2FF7M
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; 4F00<3000.3077M
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; 4F78<3080.30F7M
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; 4FF0<3100.3177M
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; 5068<3180.31F7M
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; 50E0<3200.3277M
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; 5158<3280.32F7M
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; 51D0<3300.3377M
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; 5248<3380.33F7M
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; 52C0<3400.3477M
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; 5338<3480.34F7M
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; 53B0<3500.3577M
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; 5428<3580.35F7M
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; 54A0<3600.3677M
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; 5518<3680.36F7M
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; 5590<3700.3777M
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; 5608<3780.37F7M
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; 5680<3800.3877M
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; 56F8<3880.38F7M
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; 5770<3900.3977M
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; 57E8<3980.39F7M
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; 5860<3A00.3A77M
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; 58D8<3A80.3AF7M
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; 5950<3B00.3B77M
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; 59C8<3B80.3BF7M
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; 5A40<3C00.3C77M
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; 5AB8<3C80.3CF7M
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; 5B30<3D00.3D77M
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; 5BA8<3D80.3DF7M
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; 5C20<3E00.3E77M
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; 5C98<3E80.3EF7M
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; 5D10<3F00.3F77M
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; 5D88<3F80.3FF7M
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;
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; Unpack - Monitor Commands
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; =========================
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; 2000<4000.4077M
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; 2078<4080.40F7M
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; 20F0<4100.4177M
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; 2168<4180.41F7M
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; 21E0<4200.4277M
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; 2258<4280.42F7M
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; 22D0<4300.4377M
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; 2348<4380.43F7M
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; 23C0<4400.4477M
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; 2438<4480.44F7M
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; 24B0<4500.4577M
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; 2528<4580.45F7M
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; 25A0<4600.4677M
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; 2618<4680.46F7M
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; 2690<4700.4777M
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; 2708<4780.47F7M
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; 2780<4800.4877M
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; 27F8<4880.48F7M
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; 2870<4900.4977M
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; 28E8<4980.49F7M
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; 2960<4A00.4A77M
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; 29D8<4A80.4AF7M
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; 2A50<4B00.4B77M
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; 2AC8<4B80.4BF7M
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; 2B40<4C00.4C77M
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; 2BB8<4C80.4CF7M
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; 2C30<4D00.4D77M
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; 2CA8<4D80.4DF7M
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; 2D20<4E00.4E77M
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; 2D98<4E80.4EF7M
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; 2E10<4F00.4F77M
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; 2E88<4F80.4FF7M
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; 2F00<5000.5077M
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; 2F78<5080.50F7M
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; 2FF0<5100.5177M
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; 3068<5180.51F7M
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; 30E0<5200.5277M
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; 3158<5280.52F7M
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; 31D0<5300.5377M
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; 3248<5380.53F7M
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; 32C0<5400.5477M
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; 3338<5480.54F7M
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; 33B0<5500.5577M
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; 3428<5580.55F7M
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; 34A0<5600.5677M
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; 3518<5680.56F7M
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; 3590<5700.5777M
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; 3608<5780.57F7M
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; 3680<5800.5877M
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; 36F8<5880.58F7M
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; 3770<5900.5977M
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; 37E8<5980.59F7M
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; 3860<5A00.5A77M
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; 38D8<5A80.5AF7M
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; 3950<5B00.5B77M
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; 39C8<5B80.5BF7M
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; 3A40<5C00.5C77M
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; 3AB8<5C80.5CF7M
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; 3B30<5D00.5D77M
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; 3BA8<5D80.5DF7M
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;
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; First Packed Byte: $4000
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; Last Packed Byte: $5DFF
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; Each page of HGR memory has 6 scanlines
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; First Half of Page ($78 bytes) = 3 scanlines
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; Last Half of Page ($78 bytes) = 3 scanlines
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Row = $FB ; 6 scanlines/page processed per loop
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Dst = $FC
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Src = $FE
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org $300
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; ========================================================================
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Pack
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lda #$20 ; Src: HGR Page 1
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ldx #$40 ; Dst: HGR Page 2
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sta Row ; 32 pages * 6 scanlines/page = 192 scanlines
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ldy #Src
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bne Common
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; ========================================================================
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Unpack
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lda #$40 ; Src: HGR Page 2
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ldx #$20 ; Dst: HGR Page 1
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stx Row ; 32 pages * 6 scanlines/page = 192 scanlines
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ldy #Dst
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; A = Src Page
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; X = Dst Page
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; Pack:
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; Y = Src zero-page address
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; Unpack:
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; Y = Dst zero-page address
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; ========================================================================
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Common
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sty _Delta1+1 ; *** SELF-MODIFYING
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sty _Delta2+1 ; *** SELF-MODIFYING
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iny
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sty _Delta3+1 ; *** SELF-MODIFYING
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ldy #$00 ; low of src, low of dst
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sty Src+0
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sta Src+1
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sty Dst+0
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stx Dst+1
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; -------- process 3 scan lines
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HalfPage
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ldx #$78 ; Pack 3 (non-linear) scan lines [$2000..$2027, $2028..$2057, $2058..$2077]
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CopyHalf
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lda (Src),y
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sta (Dst),y
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inc Src+0 ; src++
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bne SrcPage
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inc Src+1 ; 16-bit pointer
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SrcPage
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inc Dst+0 ; dst++
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bne DstPage
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inc Dst+1 ; 16-bit pointer
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DstPage
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dex
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bne CopyHalf
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; -------- processed 6 scanlines?
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clc ; src += 8
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_Delta1 lda Src+0 ; *** SELF-MODIFIED
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adc #8 ; src = $xx78 + 8 -> $xx80
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_Delta2 sta Src+0 ; *** SELF-MODIFIED
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bne HalfPage ; src = $xxF8 + 8 -> $yy00
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_Delta3 inc Src+1 ; *** SELF-MODIFIED
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dec Row
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bne HalfPage
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rts
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