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f81f087a13
...
d61a7bf284
3
.gitmodules
vendored
3
.gitmodules
vendored
@ -1,3 +0,0 @@
|
||||
[submodule "liblzg"]
|
||||
path = liblzg
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url = https://github.com/mbitsnbites/liblzg.git
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@ -1,6 +0,0 @@
|
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# License
|
||||
* [snake6502](https://git.giomba.it/giomba/snake6502) has been written by giomba and is released under the terms of the [GNU General Public License 3.0](https://www.gnu.org/licenses/gpl-3.0.txt)
|
||||
|
||||
* [liblzg](https://liblzg.bitsnbites.eu/) has been written by Marcus Geelnard and is released under the terms of the [zlib license](https://opensource.org/licenses/Zlib)
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||||
|
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|
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34
Makefile
34
Makefile
@ -1,31 +1,18 @@
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||||
.POSIX:
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|
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ASM=$(wildcard src/*.asm)
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RES=res.bin/amour.sid res.bin/levels.bin res.bin/unlzg.bin
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RES=res.bin/amour.sid res.bin/levels.bin
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|
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ifeq "$(CARTRIDGE)" "1"
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FORMAT:=3
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else
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FORMAT:=1
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endif
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|
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.PHONY: debug env clean
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bin/snake.bin: bin/snake.pack.lz
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dasm src/cart.asm -Isrc/ -DVERBOSE=$(VERBOSE) -f3 -sbuild/cart.symbols.txt -obin/snake.bin
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|
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#bin/tape.prg: bin/snake.pack.lz.file
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# dasm src/tape.asm -Isrc/ -DVERBOSE=$(VERBOSE) -f1 -sbuild/tape.sybols.txt -obin/tape.prg
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||||
|
||||
#bin/snake.pack.lz.file: bin/snake.pack.lz
|
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# echo -e "\x00\x80" > bin/snake.pack.lz.file
|
||||
# cat bin/snake.pack.lz >> bin/snake.pack.lz.file
|
||||
|
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bin/snake.prg: bin/snake.pack
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dasm src/prg.asm -Isrc/ -DVERBOSE=$(VERBOSE) -f1 -sbuild/prg.symbols.txt -obin/snake.prg
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|
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bin/snake.pack: env $(ASM) $(RES) bin/explodefont
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dasm src/main.asm -Isrc/ -DSYSTEM=64 -DDEBUG=$(DEBUG) -DVERBOSE=$(VERBOSE) -DCARTRIDGE=$(CARTRIDGE) -f3 -sbuild/pack.symbols.txt -obin/snake.pack
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||||
|
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bin/snake.pack.lz: bin/snake.pack liblzg/src/tools/lzg
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liblzg/src/tools/lzg bin/snake.pack > bin/snake.pack.lz
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|
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liblzg/src/tools/lzg:
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cd liblzg/src && make
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bin/snake.prg: env $(ASM) $(RES) bin/explodefont
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dasm src/main.asm -Isrc/ -DSYSTEM=64 -DDEBUG=$(DEBUG) -DVERBOSE=$(VERBOSE) -DCARTRIDGE=$(CARTRIDGE) -f$(FORMAT) -sbuild/symbols.txt -obin/snake.prg
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|
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clean:
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rm -rf {build,bin,res.bin}
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@ -42,9 +29,6 @@ res.bin/amour.sid:
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res.bin/levels.bin: bin/level res.org/levels.txt
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bin/level < res.org/levels.txt > res.bin/levels.bin
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|
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res.bin/unlzg.bin:
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cp res.org/unlzg.bin res.bin/unlzg.bin
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|
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bin/level: util/rlevel.cpp
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g++ -o bin/level util/rlevel.cpp
|
||||
|
||||
|
||||
38
README.md
38
README.md
@ -13,37 +13,25 @@ You need the GNU compiler collection and the [dasm](https://dasm-assembler.githu
|
||||
```
|
||||
$ make
|
||||
```
|
||||
Interesting targets:
|
||||
|
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* ```make bin/snake.bin``` produces .bin, ready to be burnt on an 8K EEPROM for making a cartridge (default)
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* ```make bin/snake.prg``` produces .prg for the emulator, ready to be used on tape/disk
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* ```make tape/disk``` (fastloader, to be done)
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||||
|
||||
You can also define the following environment variables:
|
||||
|
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```$ DEBUG=1 make``` build with debugging artifacts
|
||||
|
||||
```$ VERBOSE=1 make``` output useful info during compilation
|
||||
|
||||
```$ CARTRIDGE=1 make``` produces an 8K bin ready to be burnt to an *PROM
|
||||
|
||||
## Developer docs
|
||||
### Package
|
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The whole program is assembled into a ```snake.pack``` binary blob with the following structure.
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|
||||
Absolute | Offset | Description
|
||||
------------|-------------|------------
|
||||
```$1000``` | ```$0000``` | load address
|
||||
```$2800``` | ```$1800``` | entry point (start address)
|
||||
|
||||
### Memory map
|
||||
Address | PRG | Description
|
||||
----------------------|-------|------------
|
||||
```$0000 - $0001``` | no | hardware
|
||||
```$0002 - $00FF``` | no | zero page pointers
|
||||
```$0100 - $01FF``` | no | stack page
|
||||
```$0200 - $07FF``` | no | *free ram*
|
||||
```$1000 - $1FFF``` | yes | SID tune
|
||||
```$0100 - $07FF``` | no | *free ram*
|
||||
```$0800 - $0FFF``` | yes | autostart (BASIC or cartridge) + Low Program Segment
|
||||
```$1000 - $1FFF``` | yes | SID tune + Middle Program Segment
|
||||
```$2000 - $27FF``` | yes | custom char
|
||||
```$2800 - $xxxx``` | yes | Program segment (only needed part used)
|
||||
```$2800 - $xxxx``` | yes | High Program Segment (only needed part used)
|
||||
```$xxxx - $CCFF``` | no | *free ram*
|
||||
```$CD00 - $CDFF``` | no | data segment (not-initialized vars)
|
||||
```$CE00 - $CEFF``` | no | list X
|
||||
@ -51,14 +39,9 @@ Address | PRG | Description
|
||||
```$D000 - $DFFF``` | no | I/O
|
||||
```$E000 - $FFFF``` | no | Kernal
|
||||
|
||||
### Compression
|
||||
```snake.pack``` is compressed into ```snake.pack.lz``` using [liblzg](https://github.com/mbitsnbites/liblzg), to save space in order to fit the game in a *PROM.
|
||||
Note: program (code) segments have been put in all possible free spots in order to squeeze the game into an 8K cartridge.
|
||||
|
||||
### Decompression
|
||||
```cart.asm``` is located at ```$8000``` (standard org address for C64 cartridges), and contains the decompression routine and the ```snake.pack.lz```. It decompresses ```snake.pack.lz``` back to ```$1000```, and jumps to its entry point at ```$2800```.
|
||||
|
||||
### Miscellanea
|
||||
#### Custom charset
|
||||
### Custom charset
|
||||
Index | Description
|
||||
----------------|-------------
|
||||
```$00 - $1F``` | A-Z (space first)
|
||||
@ -67,3 +50,8 @@ Index | Description
|
||||
```$50 - $5F``` | hex digits, reversed
|
||||
```$60 - ``` | game tiles
|
||||
|
||||
### Cartridge
|
||||
Cartridge version is at $8000 and simply copies itself back at $800.
|
||||
|
||||
Cartridge version can not be built with DEBUG=1 flag due to size constraints.
|
||||
|
||||
|
||||
1
liblzg
1
liblzg
@ -1 +0,0 @@
|
||||
Subproject commit 182b56cb36843720f38eff2ec30db1deac4e85bd
|
||||
Binary file not shown.
59
src/cart.asm
59
src/cart.asm
@ -1,15 +1,11 @@
|
||||
processor 6502
|
||||
|
||||
SEG.U zeropageSegment
|
||||
org $02
|
||||
INCLUDE "zeropage.asm"
|
||||
|
||||
SEG cartridgeSegment
|
||||
org $8000
|
||||
#if VERBOSE = 1
|
||||
LASTINIT SET .
|
||||
#endif
|
||||
|
||||
cartridge SUBROUTINE
|
||||
WORD .coldstart
|
||||
WORD .warmstart
|
||||
|
||||
WORD #$8009
|
||||
WORD #$801a
|
||||
|
||||
; CBM80 in PETSCII (cartridge signature for autostart)
|
||||
BYTE #$c3,#$c2,#$cd,#$38,#$30
|
||||
@ -24,35 +20,28 @@ cartridge SUBROUTINE
|
||||
cli
|
||||
|
||||
.warmstart:
|
||||
; address of input compressed data
|
||||
lda #<.lzpack
|
||||
; Copy cartridge content into proper memory location
|
||||
ldx #$20
|
||||
lda #$0
|
||||
tay
|
||||
sta srcPointer
|
||||
lda #>.lzpack
|
||||
sta srcPointer + 1
|
||||
|
||||
; address of output decompressed data
|
||||
lda #$00
|
||||
sta dstPointer
|
||||
lda #$10
|
||||
lda #>cartridgeStart
|
||||
sta srcPointer + 1
|
||||
lda #$08
|
||||
sta dstPointer + 1
|
||||
jsr inflate
|
||||
.loop:
|
||||
lda (srcPointer),y
|
||||
sta (dstPointer),y
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||||
iny
|
||||
bne .loop
|
||||
inc srcPointer + 1
|
||||
inc dstPointer + 1
|
||||
dex
|
||||
bne .loop
|
||||
|
||||
; jump to program entry
|
||||
jmp $2800
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||||
|
||||
; compressed pack
|
||||
.lzpack:
|
||||
INCBIN "bin/snake.pack.lz"
|
||||
|
||||
; decompression util
|
||||
INCLUDE "lzgmini.asm"
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||||
jmp start
|
||||
|
||||
#if VERBOSE = 1
|
||||
ECHO "8k CARTRIDGE SIZE:",(. - $8000),"=",[(. - $8000)d]
|
||||
ECHO "SPACE LEFT:",($9fff - .),"=",[($9fff - .)d]
|
||||
ECHO "cart.asm @ ",LASTINIT,"len:",(. - LASTINIT)
|
||||
#endif
|
||||
|
||||
; force filler for the *PROM
|
||||
. = $9fff
|
||||
BYTE #$ff
|
||||
|
||||
|
||||
242
src/lzgmini.asm
242
src/lzgmini.asm
@ -1,242 +0,0 @@
|
||||
inflate SUBROUTINE
|
||||
.inEnd EQU 2
|
||||
.offset EQU 4
|
||||
.length EQU 6
|
||||
.symbol EQU 25
|
||||
.marker1 EQU 30
|
||||
.marker2 EQU 31
|
||||
.marker3 EQU 32
|
||||
.marker4 EQU 33
|
||||
.copy EQU 34
|
||||
|
||||
clc
|
||||
ldy #10
|
||||
lda (srcPointer),y
|
||||
adc srcPointer
|
||||
sta .inEnd
|
||||
dey
|
||||
lda (srcPointer),y
|
||||
adc srcPointer + 1
|
||||
sta .inEnd + 1
|
||||
clc
|
||||
lda .inEnd
|
||||
adc #16
|
||||
sta .inEnd
|
||||
lda .inEnd + 1
|
||||
adc #0
|
||||
sta .inEnd + 1
|
||||
|
||||
; Get the marker symbols
|
||||
ldy #16
|
||||
lda (srcPointer),y
|
||||
sta .marker1
|
||||
iny
|
||||
lda (srcPointer),y
|
||||
sta .marker2
|
||||
iny
|
||||
lda (srcPointer),y
|
||||
sta .marker3
|
||||
iny
|
||||
lda (srcPointer),y
|
||||
sta .marker4
|
||||
|
||||
; Skip header + marker symbols (16 + 4 bytes)
|
||||
clc
|
||||
lda srcPointer
|
||||
adc #20
|
||||
sta srcPointer
|
||||
lda srcPointer + 1
|
||||
adc #0
|
||||
sta srcPointer + 1
|
||||
|
||||
; Main decompression loop
|
||||
ldy #0 ; Make sure that Y is zero
|
||||
.mainloop:
|
||||
lda srcPointer ; done?
|
||||
cmp .inEnd
|
||||
bne .notdone
|
||||
lda srcPointer + 1
|
||||
cmp .inEnd + 1
|
||||
bne .notdone
|
||||
rts
|
||||
.notdone:
|
||||
lda (srcPointer),y ; A = symbol
|
||||
sta .symbol
|
||||
sta $d020
|
||||
inc srcPointer
|
||||
bne .noinc1
|
||||
inc srcPointer + 1
|
||||
.noinc1:
|
||||
cmp .marker1 ; Marker1?
|
||||
beq .domarker1
|
||||
cmp .marker2 ; Marker2?
|
||||
beq .domarker2
|
||||
cmp .marker3 ; Marker3?
|
||||
beq .domarker3
|
||||
cmp .marker4 ; Marker4?
|
||||
beq .domarker4
|
||||
.literal:
|
||||
lda .symbol
|
||||
sta (dstPointer),y ; Plain copy
|
||||
inc dstPointer
|
||||
bne .mainloop
|
||||
inc dstPointer + 1
|
||||
bne .mainloop
|
||||
|
||||
.domarker1:
|
||||
jmp .domarker1b
|
||||
|
||||
; marker4 - "Near copy (incl. RLE)"
|
||||
.domarker4:
|
||||
lda (srcPointer),y
|
||||
inc srcPointer
|
||||
bne .noinc3
|
||||
inc srcPointer + 1
|
||||
.noinc3:
|
||||
cmp #0
|
||||
beq .literal ; Single occurance of the marker symbol (rare)
|
||||
tax
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
sta .offset
|
||||
inc .offset
|
||||
lda #0
|
||||
sta .offset + 1 ; offset = (b >> 5) + 1
|
||||
txa
|
||||
and #$1f
|
||||
tax
|
||||
lda .LZG_LENGTH_DECODE_LUT,x
|
||||
sta .length ; length = .LZG_LENGTH_DECODE_LUT[b & 0x1f]
|
||||
jmp .docopy
|
||||
|
||||
; marker3 - "Short copy"
|
||||
.domarker3:
|
||||
lda (srcPointer),y
|
||||
inc srcPointer
|
||||
bne .noinc4
|
||||
inc srcPointer + 1
|
||||
.noinc4:
|
||||
cmp #0
|
||||
beq .literal ; Single occurance of the marker symbol (rare)
|
||||
tax
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
clc
|
||||
adc #3
|
||||
sta .length ; length = (b >> 6) + 3
|
||||
txa
|
||||
and #$3f
|
||||
adc #8
|
||||
sta .offset
|
||||
lda #0
|
||||
sta .offset + 1 ; offset = (b & 0x3f) + 8
|
||||
beq .docopy
|
||||
|
||||
; marker2 - "Medium copy"
|
||||
.domarker2:
|
||||
lda (srcPointer),y
|
||||
inc srcPointer
|
||||
bne .noinc5
|
||||
inc srcPointer + 1
|
||||
.noinc5:
|
||||
cmp #0
|
||||
beq .literal ; Single occurance of the marker symbol (rare)
|
||||
tax
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
sta .offset + 1
|
||||
lda (srcPointer),y
|
||||
inc srcPointer
|
||||
bne .noinc6
|
||||
inc srcPointer + 1
|
||||
.noinc6:
|
||||
clc
|
||||
adc #8
|
||||
sta .offset
|
||||
bcc .noinc7
|
||||
inc .offset + 1 ; offset = (((b & 0xe0) << 3) | b2) + 8
|
||||
.noinc7:
|
||||
txa
|
||||
and #$1f
|
||||
tax
|
||||
lda .LZG_LENGTH_DECODE_LUT,x
|
||||
sta .length ; length = .LZG_LENGTH_DECODE_LUT[b & 0x1f]
|
||||
bne .docopy
|
||||
|
||||
.literal2:
|
||||
jmp .literal
|
||||
|
||||
; marker1 - "Distant copy"
|
||||
.domarker1b:
|
||||
lda (srcPointer),y
|
||||
inc srcPointer
|
||||
bne .noinc8
|
||||
inc srcPointer + 1
|
||||
.noinc8:
|
||||
cmp #0
|
||||
beq .literal2 ; Single occurance of the marker symbol (rare)
|
||||
and #$1f
|
||||
tax
|
||||
lda .LZG_LENGTH_DECODE_LUT,x
|
||||
sta .length ; length = .LZG_LENGTH_DECODE_LUT[b & 0x1f]
|
||||
lda (srcPointer),y
|
||||
inc srcPointer
|
||||
bne .noinc9
|
||||
inc srcPointer + 1
|
||||
.noinc9:
|
||||
sta .offset + 1
|
||||
lda (srcPointer),y
|
||||
inc srcPointer
|
||||
bne .noinc10
|
||||
inc srcPointer + 1
|
||||
.noinc10:
|
||||
clc
|
||||
adc #$08
|
||||
sta .offset
|
||||
lda .offset + 1
|
||||
adc #$08
|
||||
sta .offset + 1 ; offset = ((b2 << 8) | (*src++)) + 2056
|
||||
|
||||
; Copy corresponding data from history window
|
||||
.docopy:
|
||||
sec
|
||||
lda dstPointer
|
||||
sbc .offset
|
||||
sta .copy
|
||||
lda dstPointer + 1
|
||||
sbc .offset + 1
|
||||
sta .copy + 1
|
||||
.loop1:
|
||||
lda (.copy),y
|
||||
sta (dstPointer),y
|
||||
iny
|
||||
cpy .length
|
||||
bne .loop1
|
||||
ldy #0 ; Make sure that Y is zero
|
||||
|
||||
clc
|
||||
lda dstPointer
|
||||
adc .length
|
||||
sta dstPointer
|
||||
bcc .noinc11
|
||||
inc dstPointer + 1
|
||||
.noinc11:
|
||||
jmp .mainloop
|
||||
|
||||
; Lookup Table for decoding the copy length parameter
|
||||
.LZG_LENGTH_DECODE_LUT
|
||||
BYTE 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,35,48,72,128
|
||||
|
||||
|
||||
|
||||
|
||||
89
src/main.asm
89
src/main.asm
@ -20,6 +20,34 @@
|
||||
ECHO "End of zeropage variables. Space left: ",($90 - .)
|
||||
#endif
|
||||
|
||||
; Initialized segments
|
||||
; ----------------------------------------------------------------------
|
||||
SEG autostartSegment
|
||||
#if CARTRIDGE = 0
|
||||
org $801
|
||||
INCLUDE "basic.asm" ; BASIC _MUST_ stay at this address
|
||||
#else
|
||||
org $800
|
||||
INCLUDE "cart.asm"
|
||||
#endif
|
||||
INCLUDE "initdata.asm"
|
||||
|
||||
; Program "Segment" Low
|
||||
; ----------------------------------------------------------------------
|
||||
; You just have to fill this empty space, don't you think so? ;-)
|
||||
INCLUDE "game.asm"
|
||||
INCLUDE "gameover.asm"
|
||||
INCLUDE "introreset.asm"
|
||||
INCLUDE "program.asm"
|
||||
INCLUDE "subroutines.asm"
|
||||
INCLUDE "levels.asm"
|
||||
INCLUDE "intro1.asm"
|
||||
; Note: some code had to be included at an higher address
|
||||
|
||||
#if VERBOSE = 1
|
||||
ECHO "End of Low Program Segment. Space left:",($1000 - .)
|
||||
#endif
|
||||
|
||||
; SID tune (previously properly cleaned, see HVSC)
|
||||
; ----------------------------------------------------------------------
|
||||
SEG sidSegment
|
||||
@ -27,36 +55,47 @@
|
||||
sidtune:
|
||||
INCBIN "../res.bin/amour.sid"
|
||||
#if VERBOSE = 1
|
||||
ECHO "End of SIDtune at ",.,"Space left:",($2000 - .)
|
||||
ECHO "End of SIDtune at ",.
|
||||
#endif
|
||||
|
||||
; Font Data
|
||||
; ----------------------------------------------------------------------
|
||||
SEG fontSegment
|
||||
org $2000
|
||||
; This binary data that defines the font is exactly 2kB long ($800)
|
||||
INCLUDE "font.asm"
|
||||
|
||||
; Program Segment
|
||||
; ----------------------------------------------------------------------
|
||||
SEG programSegment
|
||||
org $2800
|
||||
INCLUDE "program.asm"
|
||||
INCLUDE "initdata.asm"
|
||||
INCLUDE "game.asm"
|
||||
INCLUDE "gameover.asm"
|
||||
INCLUDE "introreset.asm"
|
||||
INCLUDE "subroutines.asm"
|
||||
INCLUDE "levels.asm"
|
||||
INCLUDE "intro1.asm"
|
||||
INCLUDE "multicolor.asm"
|
||||
INCLUDE "levelreset.asm"
|
||||
INCLUDE "outro.asm"
|
||||
#if VERBOSE = 1
|
||||
ECHO "End of program segment at:",.
|
||||
ECHO "PACK SIZE:",(. - $1000),"=",[(. - $1000)d]
|
||||
ECHO "End of Middle Program Segment. Space left:",($2000 - .)
|
||||
#endif
|
||||
|
||||
; Font Data
|
||||
; ----------------------------------------------------------------------
|
||||
SEG tggsSegment
|
||||
org $2000
|
||||
; This binary data that defines the font is exactly 2kB long ($800)
|
||||
tggsFont:
|
||||
INCLUDE "tggs.asm"
|
||||
|
||||
; Program Segment High
|
||||
; ----------------------------------------------------------------------
|
||||
|
||||
#if VERBOSE = 1
|
||||
ECHO "End of High Program Segment at: ",.,"Space left:",($cd00 - .)
|
||||
#endif
|
||||
|
||||
#if VERBOSE = 1
|
||||
#if CARTRIDGE = 0
|
||||
; +2 because of PRG header
|
||||
ECHO "PRG size:",([. - $801 + 2]d),"dec"
|
||||
#else
|
||||
ECHO "BIN size:",([. - $800]d),"dec"
|
||||
#endif
|
||||
#endif
|
||||
|
||||
; Uninitialized segments
|
||||
; ----------------------------------------------------------------------
|
||||
; Cartridge locations
|
||||
; -------------------
|
||||
SEG.U cartridgeSegment
|
||||
org $8000
|
||||
cartridgeStart:
|
||||
|
||||
; Data variables
|
||||
; -----------------
|
||||
SEG.U dataSegment
|
||||
@ -74,8 +113,10 @@ listX DS 256
|
||||
listY DS 256
|
||||
|
||||
;
|
||||
; coded 2017, 2018, 2019, 2020
|
||||
; coded during december 2017
|
||||
; by giomba -- giomba at glgprograms.it
|
||||
; this software is free software and is distributed
|
||||
; under the terms of GNU GPL v3 license
|
||||
;
|
||||
|
||||
; vim: set expandtab tabstop=4 shiftwidth=4:
|
||||
|
||||
26
src/prg.asm
26
src/prg.asm
@ -1,26 +0,0 @@
|
||||
processor 6502
|
||||
|
||||
SEG.U
|
||||
org $02
|
||||
INCLUDE "zeropage.asm"
|
||||
|
||||
SEG autostart
|
||||
org $801
|
||||
autostartRoutine SUBROUTINE
|
||||
; this is at $801
|
||||
; and it MUST be exactly at this location in order to autostart
|
||||
; 10 SYS2060 ($80c) BASIC autostart
|
||||
BYTE #$0b,#$08,#$0a,#$00,#$9e,#$32,#$30,#$36,#$31,#$00,#$00,#$00
|
||||
|
||||
; this is at (2061 dec)=($80d)
|
||||
; and it MUST be exactly after the above BASIC statement
|
||||
. = $80d
|
||||
jmp $2800
|
||||
|
||||
. = $1000
|
||||
INCBIN "../bin/snake.pack"
|
||||
|
||||
#if VERBOSE = 1
|
||||
ECHO "PRG SIZE:",(. - $801 + 2),"=",[(. - $801 + 2)d]
|
||||
#endif
|
||||
|
||||
@ -2564,5 +2564,5 @@ LASTINIT SET .
|
||||
BYTE #%00000000
|
||||
|
||||
#if VERBOSE = 1
|
||||
ECHO "font.asm @ ",LASTINIT,"len:",(. - LASTINIT)
|
||||
ECHO "tggs.asm @ ",LASTINIT,"len:",(. - LASTINIT)
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user