sa: try to merge everythign into one big compressed image
This commit is contained in:
Vince Weaver
parent
3a02db54fe
commit
1bfaf14f98
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@ -0,0 +1,12 @@
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MEMORY {
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ZP: start = $00, size = $1A, type = rw;
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RAM: start = $5a00, size = $5000, file = %O;
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}
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SEGMENTS {
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CODE: load = RAM, type = ro, align = $100;
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RODATA: load = RAM, type = ro;
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DATA: load = RAM, type = rw;
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BSS: load = RAM, type = bss, define = yes;
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ZEROPAGE: load = ZP, type = zp;
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}
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@ -0,0 +1,12 @@
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MEMORY {
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ZP: start = $00, size = $1A, type = rw;
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RAM: start = $800, size = $8E00, file = %O;
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}
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SEGMENTS {
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CODE: load = RAM, type = ro, align = $100;
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RODATA: load = RAM, type = ro;
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DATA: load = RAM, type = rw;
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BSS: load = RAM, type = bss, define = yes;
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ZEROPAGE: load = ZP, type = zp;
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}
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@ -5,25 +5,50 @@ TOKENIZE = ../asoft_basic-utils/tokenize_asoft
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all: still_alive.dsk
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still_alive.dsk: STILL_ALIVE TITLE.BAS ENDING
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$(DOS33) -y still_alive.dsk BSAVE -a 0x0C00 STILL_ALIVE
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still_alive.dsk: SA_COMPRESSED STILL_ALIVE TITLE.BAS ENDING
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$(DOS33) -y still_alive.dsk BSAVE -a 0x5a00 SA_COMPRESSED
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$(DOS33) -y still_alive.dsk BSAVE -a 0x0800 STILL_ALIVE
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$(DOS33) -y still_alive.dsk BSAVE -a 0x1800 ENDING
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$(DOS33) -y still_alive.dsk SAVE A TITLE.BAS
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# $(DOS33) -y still_alive.dsk SAVE B GLADOS.HGR
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SA_COMPRESSED: sa_compressed.o
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ld65 -o SA_COMPRESSED sa_compressed.o -C ../linker_scripts/apple2_5a00.inc
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sa_compressed.o: sa_compressed.s \
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STILL_ALIVE.lz4 ENDING.lz4 SA.ED.lz4 SA.KR4.lz4
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ca65 -o sa_compressed.o sa_compressed.s -l sa_compressed.lst
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SA.ED.lz4: SA.ED
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lz4 -f -16 SA.ED
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truncate --size=-8 SA.ED.lz4
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SA.KR4.lz4: SA.KR4
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lz4 -f -16 SA.KR4
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truncate --size=-8 SA.KR4.lz4
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STILL_ALIVE.lz4: STILL_ALIVE
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lz4 -f -16 STILL_ALIVE
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truncate --size=-8 STILL_ALIVE.lz4
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ENDING.lz4: ENDING
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lz4 -f -16 ENDING
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truncate --size=-8 ENDING.lz4
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STILL_ALIVE: still_alive.o
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ld65 -o STILL_ALIVE still_alive.o -C ../linker_scripts/apple2_c00.inc
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ld65 -o STILL_ALIVE still_alive.o -C ../linker_scripts/apple2_800.inc
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still_alive.o: still_alive.s \
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../asm_routines/mockingboard.s \
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../asm_routines/lz4_decode.s \
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mockingboard_a.s lz4_decode.s \
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display_art.s display_lyrics.s \
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sa_ed.s duet.s SA.ED \
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sa_ed.s duet.s \
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sa_mb.s ascii_art.inc \
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interrupt_handler.s \
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ascii_art.inc ascii_art_lz4.inc lyrics.inc zp.inc
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ca65 -o still_alive.o still_alive.s -l still_alive.lst
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ENDING: ending.o
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ld65 -o ENDING ending.o -C ../linker_scripts/apple2_1800.inc
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@ -35,4 +60,4 @@ TITLE.BAS: title.bas
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$(TOKENIZE) < title.bas> TITLE.BAS
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clean:
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rm -f *~ *.o *.lst STILL_ALIVE SA_ED ENDING
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rm -f *~ *.o *.lz4 *.lst STILL_ALIVE SA_ED ENDING SA_COMPRESSED
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@ -48,14 +48,15 @@ have art loading properly 40col: 18910
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lz4 encode the ascii art: 15529
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revert because lz4 code not re-entrant: 18910
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add 4-channel music (KR4): 20128
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add cursor (a bit distracting) 20162
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add cursor (a bit distracting): 20162
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feature complete 40 col: 20180
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intial 80 col support: 20191
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80 col cursor: 20344
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strip out some unneeded text printing: 19962
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merge ED and MB code 24993
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merge ED and MB code: 24993
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properly select between versions: 25001
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merge the ED and MB lyrics: 22828
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80 column ED, wait for keypress+reboot at end: 22852
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Memory Map:
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@ -73,12 +74,12 @@ D000: ROM
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FFFF: END
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Code: c00 - 8c00 32k
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(8k=audio, 5k=lyrics, 3k=art)
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Sound buffers: 5e00-9600 = 14k
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Plan:
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Load compressed 18k image at $5000 - $9600
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Load compressed 16k image ($4000) at $5600 - $9600
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Decompress ENDING sequence at $1800 - $4000
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When done, decompress STILL_ALIVE (22k) at $C00 - $5000
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(writes background to HGR graphics automatically)
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When done:
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+ STILL_ALIVE ($5a00, 22.5k) at $0c00 - $6600
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+ Sound buffers ($3800, 14k) at $5e00 - $9600
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(the overlap is OK, the ED file is over-written by
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the mockingboard buffers, but that is not used by MB)
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@ -0,0 +1,5 @@
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; move these to zero page for slight speed increase?
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gr_offsets:
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.word $400,$480,$500,$580,$600,$680,$700,$780
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.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
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.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
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@ -0,0 +1,207 @@
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; LZ4 data decompressor for Apple II
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; Code by Peter Ferrie (qkumba) (peter.ferrie@gmail.com)
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; "LZ4 unpacker in 143 bytes (6502 version) (2013)"
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; http://pferrie.host22.com/misc/appleii.htm
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; This is that code, but with comments and labels added for clarity.
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; I also found a bug when decoding with runs of multiples of 256
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; which has since been fixed upstream.
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; For LZ4 reference see
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; https://github.com/lz4/lz4/wiki/lz4_Frame_format.md
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; LZ4 summary:
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;
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; HEADER:
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; Should: check for magic number 04 22 4d 18
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; FLG: 64 in our case (01=version, block.index=1, block.checksum=0
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; size=0, checksum=1, reserved
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; MAX Blocksize: 40 (64kB)
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; HEADER CHECKSUM: a7
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; BLOCK HEADER: 4 bytes (le) If highest bit set, uncompressed!
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; BLOCKS:
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; Token byte. High 4-bits literal length, low 4-bits copy length
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; + If literal length==15, then following byte gets added to length
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; If that byte was 255, then keep adding bytes until not 255
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; + The literal bytes follow. There may be zero of them
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; + Next is block copy info. little-endian 2-byte offset to
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; be subtracted from current read position indicating source
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; + The low 4-bits of the token are the copy length, which needs
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; 4 added to it. As with the literal length, if it is 15 then
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; you read a byte and add (and if that byte is 255, keep adding)
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;LZ4_SRC EQU $00
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;LZ4_DST EQU $02
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;LZ4_END EQU $04
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;COUNT EQU $06
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;DELTA EQU $08
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;UNPACK_BUFFER EQU $5E00 ; offset of first unpacked byte
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;======================
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; LZ4 decode
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;======================
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; input buffer in LZ4_SRC
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; output buffer hardcoded still
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; size in ENDH:ENDL
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lz4_decode:
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lda LZ4_SRC ; packed data offset
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clc
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adc LZ4_END
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sta LZ4_END
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lda LZ4_SRC+1
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adc LZ4_END+1
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sta LZ4_END+1
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lda #>UNPACK_BUFFER ; original unpacked data offset
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sta LZ4_DST+1
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lda #<UNPACK_BUFFER
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sta LZ4_DST
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unpmain:
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ldy #0 ; used to index, always zero
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parsetoken:
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jsr getsrc ; get next token
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pha ; save for later (need bottom 4 bits)
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lsr ; number of literals in top 4 bits
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lsr ; so shift into place
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lsr
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lsr
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beq copymatches ; if zero, then no literals
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; jump ahead and copy
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jsr buildcount ; add up all the literal sizes
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; result is in ram[count+1]-1:A
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tax ; now in ram[count+1]-1:X
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jsr docopy ; copy the literals
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lda LZ4_SRC ; 16-bit compare
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cmp LZ4_END ; to see if we have reached the end
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lda LZ4_SRC+1
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sbc LZ4_END+1
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bcs done
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copymatches:
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jsr getsrc ; get 16-bit delta value
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sta DELTA
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jsr getsrc
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sta DELTA+1
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pla ; restore token
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and #$0f ; get bottom 4 bits
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; match count. 0 means 4
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; 15 means 19+, must be calculated
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jsr buildcount ; add up count bits, in ram[count+1]-:A
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clc
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adc #4 ; adjust count by 4 (minmatch)
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tax ; now in ramp[count+1]-1:X
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beq copy_no_adjust ; BUGFIX, don't increment if
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; exactly a multiple of 0x100
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bcc copy_no_adjust
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inc COUNT+1 ; increment if we overflowed
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copy_no_adjust:
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lda LZ4_SRC+1 ; save src on stack
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pha
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lda LZ4_SRC
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pha
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sec ; subtract delta
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lda LZ4_DST ; from destination, make new src
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sbc DELTA
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sta LZ4_SRC
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lda LZ4_DST+1
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sbc DELTA+1
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sta LZ4_SRC+1
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jsr docopy ; do the copy
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pla ; restore the src
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sta LZ4_SRC
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pla
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sta LZ4_SRC+1
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jmp parsetoken ; back to parsing tokens
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done:
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pla
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rts
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;=========
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; getsrc
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;=========
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; gets byte from src into A, increments pointer
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getsrc:
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lda (LZ4_SRC), Y ; get a byte from src
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inc LZ4_SRC ; increment pointer
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bne done_getsrc ; update 16-bit pointer
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inc LZ4_SRC+1 ; on 8-bit overflow
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done_getsrc:
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rts
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;============
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; buildcount
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;============
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buildcount:
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ldx #1 ; high count starts at 1
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stx COUNT+1 ; (loops at zero?)
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cmp #$0f ; if LITERAL_COUNT < 15, we are done
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bne done_buildcount
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buildcount_loop:
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sta COUNT ; save LITERAL_COUNT (15)
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jsr getsrc ; get the next byte
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tax ; put in X
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clc
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adc COUNT ; add new byte to old value
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bcc bc_8bit_oflow ; if overflow, increment high byte
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inc COUNT+1
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bc_8bit_oflow:
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inx ; check if read value was 255
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beq buildcount_loop ; if it was, keep looping and adding
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done_buildcount:
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rts
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;============
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; getput
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;============
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; gets a byte, then puts the byte
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getput:
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jsr getsrc
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; fallthrough to putdst
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;=============
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; putdst
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;=============
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; store A into destination
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putdst:
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sta (LZ4_DST), Y ; store A into destination
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inc LZ4_DST ; increment 16-bit pointer
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bne putdst_end ; if overflow, increment top byte
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inc LZ4_DST+1
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putdst_end:
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rts
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;=============================
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; docopy
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;=============================
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; copies ram[count+1]-1:X bytes
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; from src to dst
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docopy:
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docopy_loop:
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jsr getput ; get/put byte
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dex ; decrement count
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bne docopy_loop ; if not zero, loop
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dec COUNT+1 ; if zero, decrement high byte
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bne docopy_loop ; if not zero, loop
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rts
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@ -0,0 +1,206 @@
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; Mockingboad programming:
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; + Has two 6522 I/O chips connected to two AY-3-8910 chips
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; + Optionally has some speech chips controlled via the outport on the AY
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; + Often in slot 4
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; TODO: how to auto-detect?
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; References used:
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; http://macgui.com/usenet/?group=2&id=8366
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; 6522 Data Sheet
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; AY-3-8910 Data Sheet
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;========================
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; Mockingboard card
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; Essentially two 6522s hooked to the Apple II bus
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; Connected to AY-3-8910 chips
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; PA0-PA7 on 6522 connected to DA0-DA7 on AY
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; PB0 on 6522 connected to BC1
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; PB1 on 6522 connected to BDIR
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; PB2 on 6522 connected to RESET
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; left speaker
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MOCK_6522_ORB1 EQU $C400 ; 6522 #1 port b data
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MOCK_6522_ORA1 EQU $C401 ; 6522 #1 port a data
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MOCK_6522_DDRB1 EQU $C402 ; 6522 #1 data direction port B
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MOCK_6522_DDRA1 EQU $C403 ; 6522 #1 data direction port A
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; right speaker
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MOCK_6522_ORB2 EQU $C480 ; 6522 #2 port b data
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MOCK_6522_ORA2 EQU $C481 ; 6522 #2 port a data
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MOCK_6522_DDRB2 EQU $C482 ; 6522 #2 data direction port B
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MOCK_6522_DDRA2 EQU $C483 ; 6522 #2 data direction port A
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; AY-3-8910 commands on port B
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; RESET BDIR BC1
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MOCK_AY_RESET EQU $0 ; 0 0 0
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MOCK_AY_INACTIVE EQU $4 ; 1 0 0
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MOCK_AY_READ EQU $5 ; 1 0 1
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MOCK_AY_WRITE EQU $6 ; 1 1 0
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MOCK_AY_LATCH_ADDR EQU $7 ; 1 1 1
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;========================
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; Mockingboard Init
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;========================
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; Initialize the 6522s
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; set the data direction for all pins of PortA/PortB to be output
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mockingboard_init:
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lda #$ff ; all output (1)
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sta MOCK_6522_DDRB1
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sta MOCK_6522_DDRA1
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sta MOCK_6522_DDRB2
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sta MOCK_6522_DDRA2
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rts
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;======================
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; Reset Left AY-3-8910
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;======================
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reset_ay_both:
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lda #MOCK_AY_RESET
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sta MOCK_6522_ORB1
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lda #MOCK_AY_INACTIVE
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sta MOCK_6522_ORB1
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;======================
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; Reset Right AY-3-8910
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;======================
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;reset_ay_right:
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lda #MOCK_AY_RESET
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sta MOCK_6522_ORB2
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lda #MOCK_AY_INACTIVE
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sta MOCK_6522_ORB2
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rts
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; Write sequence
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; Inactive -> Latch Address -> Inactive -> Write Data -> Inactive
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;=========================================
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; Write Right/Left to save value AY-3-8910
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;=========================================
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; register in X
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; value in MB_VALUE
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write_ay_both:
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; address
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stx MOCK_6522_ORA1 ; put address on PA1 ; 3
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stx MOCK_6522_ORA2 ; put address on PA2 ; 3
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lda #MOCK_AY_LATCH_ADDR ; latch_address on PB1 ; 2
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sta MOCK_6522_ORB1 ; latch_address on PB1 ; 3
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sta MOCK_6522_ORB2 ; latch_address on PB2 ; 3
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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 3
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sta MOCK_6522_ORB2 ; 3
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; value
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lda MB_VALUE ; 3
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sta MOCK_6522_ORA1 ; put value on PA1 ; 3
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sta MOCK_6522_ORA2 ; put value on PA2 ; 3
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lda #MOCK_AY_WRITE ; ; 2
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sta MOCK_6522_ORB1 ; write on PB1 ; 3
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sta MOCK_6522_ORB2 ; write on PB2 ; 3
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lda #MOCK_AY_INACTIVE ; go inactive ; 2
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sta MOCK_6522_ORB1 ; 3
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sta MOCK_6522_ORB2 ; 3
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rts ; 6
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;===========
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; 53
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;=======================================
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; clear ay -- clear all 14 AY registers
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; should silence the card
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;=======================================
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clear_ay_both:
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ldx #14
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lda #0
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sta MB_VALUE
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clear_ay_left_loop:
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jsr write_ay_both
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||||
dex
|
||||
bpl clear_ay_left_loop
|
||||
rts
|
||||
|
||||
;=======================================
|
||||
; Detect a Mockingboard card
|
||||
;=======================================
|
||||
; Based on code from the French Touch "Pure Noise" Demo
|
||||
; Attempts to time an instruction sequence with a 6522
|
||||
;
|
||||
; If found, puts in bMB
|
||||
; MB_ADDRL:MB_ADDRH has address of Mockingboard
|
||||
; returns X=0 if not found, X=1 if found
|
||||
|
||||
mockingboard_detect:
|
||||
lda #0
|
||||
sta MB_ADDRL
|
||||
|
||||
mb_detect_loop: ; self-modifying
|
||||
lda #$07 ; we start in slot 7 ($C7) and go down to 0 ($C0)
|
||||
ora #$C0 ; make it start with C
|
||||
sta MB_ADDRH
|
||||
ldy #04 ; $CX04
|
||||
ldx #02 ; 2 tries?
|
||||
mb_check_cycle_loop:
|
||||
lda (MB_ADDRL),Y ; timer 6522 (Low Order Counter)
|
||||
; count down
|
||||
sta TEMP ; 3 cycles
|
||||
lda (MB_ADDRL),Y ; + 5 cycles = 8 cycles
|
||||
; between the two accesses to the timer
|
||||
sec
|
||||
sbc TEMP ; subtract to see if we had 8 cycles
|
||||
cmp #$f8 ; -8
|
||||
bne mb_not_in_this_slot
|
||||
dex ; decrement, try one more time
|
||||
bne mb_check_cycle_loop ; loop detection
|
||||
inx ; Mockingboard found (X=1)
|
||||
done_mb_detect:
|
||||
;stx bMB ; store result to bMB
|
||||
rts ; return
|
||||
|
||||
mb_not_in_this_slot:
|
||||
dec mb_detect_loop+1 ; decrement the "slot" (self_modify)
|
||||
bne mb_detect_loop ; loop down to one
|
||||
ldx #00
|
||||
beq done_mb_detect
|
||||
|
||||
|
||||
;=======================================
|
||||
; Detect a Mockingboard card in Slot4
|
||||
;=======================================
|
||||
; Based on code from the French Touch "Pure Noise" Demo
|
||||
; Attempts to time an instruction sequence with a 6522
|
||||
;
|
||||
; MB_ADDRL:MB_ADDRH has address of Mockingboard
|
||||
; returns X=0 if not found, X=1 if found
|
||||
|
||||
mockingboard_detect_slot4:
|
||||
lda #0
|
||||
sta MB_ADDRL
|
||||
|
||||
mb4_detect_loop: ; self-modifying
|
||||
lda #$04 ; we're only looking in Slot 4
|
||||
ora #$C0 ; make it start with C
|
||||
sta MB_ADDRH
|
||||
ldy #04 ; $CX04
|
||||
ldx #02 ; 2 tries?
|
||||
mb4_check_cycle_loop:
|
||||
lda (MB_ADDRL),Y ; timer 6522 (Low Order Counter)
|
||||
; count down
|
||||
sta TEMP ; 3 cycles
|
||||
lda (MB_ADDRL),Y ; + 5 cycles = 8 cycles
|
||||
; between the two accesses to the timer
|
||||
sec
|
||||
sbc TEMP ; subtract to see if we had 8 cycles
|
||||
cmp #$f8 ; -8
|
||||
bne mb4_not_in_this_slot
|
||||
dex ; decrement, try one more time
|
||||
bne mb4_check_cycle_loop ; loop detection
|
||||
inx ; Mockingboard found (X=1)
|
||||
done_mb4_detect:
|
||||
rts ; return
|
||||
|
||||
mb4_not_in_this_slot:
|
||||
ldx #00
|
||||
beq done_mb4_detect
|
||||
|
||||
|
|
@ -0,0 +1,313 @@
|
|||
; Still Alive Decompression Util
|
||||
|
||||
.include "zp.inc"
|
||||
|
||||
UNPACK_ENDING EQU $1800
|
||||
UNPACK_ALIVE EQU $0800
|
||||
|
||||
start:
|
||||
;==============================
|
||||
; Unpack the Ending routine from $1800-$4000
|
||||
;==============================
|
||||
|
||||
unpack_ending:
|
||||
lda #<ending
|
||||
sta LZ4_SRC
|
||||
lda #>ending
|
||||
sta LZ4_SRC+1
|
||||
|
||||
lda #<ending_end
|
||||
sta LZ4_END
|
||||
lda #>ending_end
|
||||
sta LZ4_END+1
|
||||
|
||||
lda #<UNPACK_ENDING
|
||||
sta LZ4_DST
|
||||
lda #>UNPACK_ENDING ; original unpacked data offset
|
||||
sta LZ4_DST+1
|
||||
|
||||
|
||||
|
||||
jsr lz4_decode
|
||||
|
||||
;==============================
|
||||
; Run the ending routine
|
||||
;==============================
|
||||
|
||||
jsr $1800
|
||||
|
||||
;=====================================
|
||||
; Unpack the main code from $800-$367d
|
||||
;=====================================
|
||||
|
||||
lda #<still_alive
|
||||
sta LZ4_SRC
|
||||
lda #>still_alive
|
||||
sta LZ4_SRC+1
|
||||
|
||||
lda #<still_alive_end
|
||||
sta LZ4_END
|
||||
lda #>still_alive_end
|
||||
sta LZ4_END+1
|
||||
|
||||
lda #<UNPACK_ALIVE
|
||||
sta LZ4_DST
|
||||
lda #>UNPACK_ALIVE ; original unpacked data offset
|
||||
sta LZ4_DST+1
|
||||
|
||||
jsr lz4_decode
|
||||
|
||||
;=====================================
|
||||
; Unpack the music right after previous
|
||||
;=====================================
|
||||
|
||||
;=====================================
|
||||
; MB SA.KR4 from 367D to 58ff
|
||||
;=====================================
|
||||
|
||||
lda #<music_mb
|
||||
sta LZ4_SRC
|
||||
lda #>music_mb
|
||||
sta LZ4_SRC+1
|
||||
|
||||
lda #<music_mb_end
|
||||
sta LZ4_END
|
||||
lda #>music_mb_end
|
||||
sta LZ4_END+1
|
||||
|
||||
; lda #<UNPACK_ALIVE
|
||||
; sta LZ4_DST
|
||||
; lda #>UNPACK_ALIVE ; original unpacked data offset
|
||||
; sta LZ4_DST+1
|
||||
|
||||
|
||||
jsr lz4_decode
|
||||
|
||||
|
||||
|
||||
;==============================
|
||||
; Run still alive
|
||||
;==============================
|
||||
|
||||
jmp $800
|
||||
|
||||
|
||||
|
||||
|
||||
; LZ4 data decompressor for Apple II
|
||||
|
||||
; Code by Peter Ferrie (qkumba) (peter.ferrie@gmail.com)
|
||||
; "LZ4 unpacker in 143 bytes (6502 version) (2013)"
|
||||
; http://pferrie.host22.com/misc/appleii.htm
|
||||
; This is that code, but with comments and labels added for clarity.
|
||||
; I also found a bug when decoding with runs of multiples of 256
|
||||
; which has since been fixed upstream.
|
||||
|
||||
; For LZ4 reference see
|
||||
; https://github.com/lz4/lz4/wiki/lz4_Frame_format.md
|
||||
|
||||
; LZ4 summary:
|
||||
;
|
||||
; HEADER:
|
||||
; Should: check for magic number 04 22 4d 18
|
||||
; FLG: 64 in our case (01=version, block.index=1, block.checksum=0
|
||||
; size=0, checksum=1, reserved
|
||||
; MAX Blocksize: 40 (64kB)
|
||||
; HEADER CHECKSUM: a7
|
||||
; BLOCK HEADER: 4 bytes (le) If highest bit set, uncompressed!
|
||||
; BLOCKS:
|
||||
; Token byte. High 4-bits literal length, low 4-bits copy length
|
||||
; + If literal length==15, then following byte gets added to length
|
||||
; If that byte was 255, then keep adding bytes until not 255
|
||||
; + The literal bytes follow. There may be zero of them
|
||||
; + Next is block copy info. little-endian 2-byte offset to
|
||||
; be subtracted from current read position indicating source
|
||||
; + The low 4-bits of the token are the copy length, which needs
|
||||
; 4 added to it. As with the literal length, if it is 15 then
|
||||
; you read a byte and add (and if that byte is 255, keep adding)
|
||||
|
||||
|
||||
;======================
|
||||
; LZ4 decode
|
||||
;======================
|
||||
; input buffer in LZ4_SRC
|
||||
; output buffer in LZ4_DST
|
||||
; end in LZ4_END
|
||||
|
||||
lz4_decode:
|
||||
|
||||
unpmain:
|
||||
ldy #0 ; used to index, always zero
|
||||
|
||||
parsetoken:
|
||||
jsr getsrc ; get next token
|
||||
pha ; save for later (need bottom 4 bits)
|
||||
|
||||
lsr ; number of literals in top 4 bits
|
||||
lsr ; so shift into place
|
||||
lsr
|
||||
lsr
|
||||
beq copymatches ; if zero, then no literals
|
||||
; jump ahead and copy
|
||||
|
||||
jsr buildcount ; add up all the literal sizes
|
||||
; result is in ram[count+1]-1:A
|
||||
tax ; now in ram[count+1]-1:X
|
||||
jsr docopy ; copy the literals
|
||||
|
||||
lda LZ4_SRC ; 16-bit compare
|
||||
cmp LZ4_END ; to see if we have reached the end
|
||||
lda LZ4_SRC+1
|
||||
sbc LZ4_END+1
|
||||
bcs done
|
||||
|
||||
copymatches:
|
||||
jsr getsrc ; get 16-bit delta value
|
||||
sta DELTA
|
||||
jsr getsrc
|
||||
sta DELTA+1
|
||||
|
||||
pla ; restore token
|
||||
and #$0f ; get bottom 4 bits
|
||||
; match count. 0 means 4
|
||||
; 15 means 19+, must be calculated
|
||||
|
||||
jsr buildcount ; add up count bits, in ram[count+1]-:A
|
||||
|
||||
clc
|
||||
adc #4 ; adjust count by 4 (minmatch)
|
||||
|
||||
tax ; now in ramp[count+1]-1:X
|
||||
|
||||
beq copy_no_adjust ; BUGFIX, don't increment if
|
||||
; exactly a multiple of 0x100
|
||||
bcc copy_no_adjust
|
||||
|
||||
inc COUNT+1 ; increment if we overflowed
|
||||
copy_no_adjust:
|
||||
|
||||
lda LZ4_SRC+1 ; save src on stack
|
||||
pha
|
||||
lda LZ4_SRC
|
||||
pha
|
||||
|
||||
sec ; subtract delta
|
||||
lda LZ4_DST ; from destination, make new src
|
||||
sbc DELTA
|
||||
sta LZ4_SRC
|
||||
lda LZ4_DST+1
|
||||
sbc DELTA+1
|
||||
sta LZ4_SRC+1
|
||||
|
||||
jsr docopy ; do the copy
|
||||
|
||||
pla ; restore the src
|
||||
sta LZ4_SRC
|
||||
pla
|
||||
sta LZ4_SRC+1
|
||||
|
||||
jmp parsetoken ; back to parsing tokens
|
||||
|
||||
done:
|
||||
pla
|
||||
|
||||
rts
|
||||
|
||||
|
||||
|
||||
;=========
|
||||
; getsrc
|
||||
;=========
|
||||
; gets byte from src into A, increments pointer
|
||||
getsrc:
|
||||
lda (LZ4_SRC), Y ; get a byte from src
|
||||
inc LZ4_SRC ; increment pointer
|
||||
bne done_getsrc ; update 16-bit pointer
|
||||
inc LZ4_SRC+1 ; on 8-bit overflow
|
||||
done_getsrc:
|
||||
rts
|
||||
|
||||
;============
|
||||
; buildcount
|
||||
;============
|
||||
buildcount:
|
||||
ldx #1 ; high count starts at 1
|
||||
stx COUNT+1 ; (loops at zero?)
|
||||
cmp #$0f ; if LITERAL_COUNT < 15, we are done
|
||||
bne done_buildcount
|
||||
buildcount_loop:
|
||||
sta COUNT ; save LITERAL_COUNT (15)
|
||||
jsr getsrc ; get the next byte
|
||||
tax ; put in X
|
||||
clc
|
||||
adc COUNT ; add new byte to old value
|
||||
bcc bc_8bit_oflow ; if overflow, increment high byte
|
||||
inc COUNT+1
|
||||
bc_8bit_oflow:
|
||||
inx ; check if read value was 255
|
||||
beq buildcount_loop ; if it was, keep looping and adding
|
||||
done_buildcount:
|
||||
rts
|
||||
|
||||
;============
|
||||
; getput
|
||||
;============
|
||||
; gets a byte, then puts the byte
|
||||
getput:
|
||||
jsr getsrc
|
||||
; fallthrough to putdst
|
||||
|
||||
;=============
|
||||
; putdst
|
||||
;=============
|
||||
; store A into destination
|
||||
putdst:
|
||||
sta (LZ4_DST), Y ; store A into destination
|
||||
inc LZ4_DST ; increment 16-bit pointer
|
||||
bne putdst_end ; if overflow, increment top byte
|
||||
inc LZ4_DST+1
|
||||
putdst_end:
|
||||
rts
|
||||
|
||||
;=============================
|
||||
; docopy
|
||||
;=============================
|
||||
; copies ram[count+1]-1:X bytes
|
||||
; from src to dst
|
||||
docopy:
|
||||
|
||||
docopy_loop:
|
||||
jsr getput ; get/put byte
|
||||
dex ; decrement count
|
||||
bne docopy_loop ; if not zero, loop
|
||||
dec COUNT+1 ; if zero, decrement high byte
|
||||
bne docopy_loop ; if not zero, loop
|
||||
|
||||
rts
|
||||
|
||||
|
||||
;===============================================
|
||||
; External modules
|
||||
;===============================================
|
||||
|
||||
; Note, the endings have all been truncated by 8 bytes with truncate
|
||||
; to skip the checksums at the end
|
||||
|
||||
; Load, skipping 11 bytes of header
|
||||
ending:
|
||||
.incbin "ENDING.lz4",11
|
||||
ending_end:
|
||||
|
||||
still_alive:
|
||||
.incbin "STILL_ALIVE.lz4",11
|
||||
still_alive_end:
|
||||
|
||||
music_mb:
|
||||
.incbin "SA.KR4.lz4",11
|
||||
music_mb_end:
|
||||
|
||||
music_ed:
|
||||
.incbin "SA.ED.lz4",11
|
||||
music_ed_end:
|
||||
|
||||
|
||||
|
|
@ -91,9 +91,9 @@ reset:
|
|||
;=========
|
||||
;routines
|
||||
;=========
|
||||
.include "../asm_routines/gr_offsets.s"
|
||||
.include "../asm_routines/mockingboard_a.s"
|
||||
.include "../asm_routines/lz4_decode.s"
|
||||
.include "gr_offsets.s"
|
||||
.include "mockingboard_a.s"
|
||||
.include "lz4_decode.s"
|
||||
|
||||
.include "display_art.s"
|
||||
.include "display_lyrics.s"
|
||||
|
|
@ -114,8 +114,7 @@ art:
|
|||
.include "ascii_art.inc"
|
||||
|
||||
LZ4_BUFFER:
|
||||
.incbin "SA.KR4"
|
||||
|
||||
music_address:
|
||||
.incbin "SA.ED"
|
||||
;.incbin "SA.KR4"
|
||||
;.incbin "SA.ED"
|
||||
|
||||
|
|
|
|||
|
|
@ -1,4 +1,5 @@
|
|||
5 HOME
|
||||
7 PRINT CHR$(4)"MAXFILES 1"
|
||||
10 PRINT " __ ___ ___ _ ___ __"
|
||||
15 PRINT "/ | | | | / \ | | | | |"
|
||||
20 PRINT "\_ | | | | |_| | | | | |_"
|
||||
|
|
@ -27,4 +28,4 @@
|
|||
130 POKE 768,1:POKE 769,1:GOTO 160
|
||||
140 POKE 768,0:POKE 769,0:GOTO 160
|
||||
150 POKE 768,1:POKE 769,0
|
||||
160 PRINT CHR$(4);"BRUN STILL_ALIVE"
|
||||
160 PRINT CHR$(4);"BRUN SA_COMPRESSED"
|
||||
|
|
|
|||
Loading…
Reference in New Issue