A one-button C=64 game.
Works on VICE in both NTSC and PAL modes Probably works on the hardware, too
- make
- KickAss assembler
- python 2.7
- Pillow
- This is my first ever game
- I learned 6502 ML at the end of October 2019
- All code written from scratch
- Initially in ACME, ported to KickAss
- ACME blows up if you try to use references heavily
- KickAss has functions (and pseudocommands!)
- Jumping frog sprites by me
- All other artwork by my loving wife, Panda!
<3 - Written in 30 days for the 2019 Game Off
- Double-buffered right-only scrolling engine
- 1 px/frame
- unrolled color RAM copy (codegen!)
- RLE-compressed half-screen multicolor bitmap
- Stored in horizontal major order for column unpacking
- Entire engine in raster ISRs
- No decoupling between game and frame and sprite logic
- (An attempt was made, combined with sprite multiplexing, but it killed frame performance)
- No fastloader :(
Memory Allocation
$0002-$007c Zeropage Variables 123 bytes
$007d-$00bc QSin Table 64 bytes
67 bytes free at $00bd
$0100-$01ff Stack 256 bytes
$0200-$0e30 CopyCode 3121 bytes
$0e31-$2b09 Frame Code 7385 bytes
$2b0a-$2b22 Main Loop 25 bytes
$2b23-$2b62 Quarter-Sin() table 64 bytes
$2b63-$2c27 SFX Data 197 bytes
$2c28-$332b RLE Matrix 1796 bytes
$332c-$373c RLE Matrix 1041 bytes
$373d-$3d16 RLE Color Ram 1498 bytes
$3d17-$3fd5 RLE Color Ram 703 bytes
42 bytes free at $3fd6
$4000-$43f7 MatrixBuf 1016 bytes
$43f8-$43ff SprPtrs1 8 bytes
$4400-$4fff Sprites1 3072 bytes
$5000-$53e7 ColorBuffer 1000 bytes
$5000-$53ec init 1005 bytes
19 bytes free at $53ed
$5400-$5a6b song.prg 1644 bytes
$5a6c-$5bf7 DblBuf Code 396 bytes
$5bf8-$5dd0 rleUnpackImage 473 bytes
$5dd1-$5fa9 rleUnpackTitle 473 bytes
86 bytes free at $5faa
$6000-$7f3f BitmapBuf 8000 bytes
$7f40-$a872 RLE Bitmap 10547 bytes
$a873-$bcc1 RLE Bitmap 5199 bytes
$bcc2-$bd41 Level Data 128 bytes
$bd42-$bde1 Font Data 160 bytes
$bde2-$bf56 DblBuf Code 373 bytes
169 bytes free at $bf57
$c000-$c3f7 MatrixBuf2 1016 bytes
$c3f8-$c3ff SprPtrs2 8 bytes
$c400-$cfff Sprites2 3072 bytes
4096 bytes free at $d000
$e000-$ff3f BitmapBuf2 8000 bytes
190 bytes free at $ff40
4479 total bytes free