dual version: prg + cartridge (8k)
This commit is contained in:
parent
8b8cb19651
commit
d61a7bf284
13
Makefile
13
Makefile
@ -3,10 +3,16 @@
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ASM=$(wildcard src/*.asm)
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RES=res.bin/amour.sid res.bin/levels.bin
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ifeq "$(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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.PHONY: debug env clean
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bin/snake.prg: env $(ASM) $(RES)
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dasm src/main.asm -Isrc/ -DSYSTEM=64 -DDEBUG=0 -sbuild/symbols.txt -obin/snake.prg
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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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clean:
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rm -rf {build,bin,res.bin}
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@ -14,9 +20,8 @@ clean:
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env:
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mkdir -p {build,bin,res.bin}
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debug: env $(ASM) $(RES)
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bin/explodefont: util/explodefont.cpp
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g++ -o bin/explodefont util/explodefont.cpp
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dasm src/main.asm -Isrc/ -DSYSTEM=64 -DDEBUG=1 -sbuild/symbols.txt -obin/snake.prg
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res.bin/amour.sid:
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cp res.org/amour.sid res.bin/amour.sid
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24
README.md
24
README.md
@ -13,10 +13,13 @@ You need the GNU compiler collection and the [dasm](https://dasm-assembler.githu
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```
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$ make
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```
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You can also make it output useful extra info with:
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```
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$ make debug
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```
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You can also define the following environment variables:
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```$ DEBUG=1 make``` build with debugging artifacts
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```$ VERBOSE=1 make``` output useful info during compilation
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```$ CARTRIDGE=1 make``` produces an 8K bin ready to be burnt to an *PROM
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## Developer docs
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### Memory map
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@ -25,10 +28,10 @@ Address | PRG | Description
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```$0000 - $0001``` | no | hardware
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```$0002 - $00FF``` | no | zero page pointers
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```$0100 - $07FF``` | no | *free ram*
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```$0800 - $0FFF``` | yes | initialized data segment (incl. const) + BASIC autostart
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```$1000 - $1FFF``` | yes | SID tune
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```$0800 - $0FFF``` | yes | autostart (BASIC or cartridge) + Low Program Segment
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```$1000 - $1FFF``` | yes | SID tune + Middle Program Segment
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```$2000 - $27FF``` | yes | custom char
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```$2800 - $xxxx``` | yes | program logic (only needed part used)
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```$2800 - $xxxx``` | yes | High Program Segment (only needed part used)
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```$xxxx - $CCFF``` | no | *free ram*
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```$CD00 - $CDFF``` | no | data segment (not-initialized vars)
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```$CE00 - $CEFF``` | no | list X
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@ -36,6 +39,8 @@ Address | PRG | Description
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```$D000 - $DFFF``` | no | I/O
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```$E000 - $FFFF``` | no | Kernal
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Note: program (code) segments have been put in all possible free spots in order to squeeze the game into an 8K cartridge.
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### Custom charset
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Index | Description
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----------------|-------------
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@ -45,3 +50,8 @@ Index | Description
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```$50 - $5F``` | hex digits, reversed
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```$60 - ``` | game tiles
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### Cartridge
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Cartridge version is at $8000 and simply copies itself back at $800.
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Cartridge version can not be built with DEBUG=1 flag due to size constraints.
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@ -1,2 +1,17 @@
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; 10 SYS10240 ($2800) BASIC autostart
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BYTE #$0b,#$08,#$0a,#$00,#$9e,#$31,#$30,#$32,#$34,#$30,#$00,#$00,#$00
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; this is at $801
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; and it MUST be exactly at this location in order to autostart
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; 10 SYS2060 ($80c) BASIC autostart
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BYTE #$0b,#$08,#$0a,#$00,#$9e,#$32,#$30,#$36,#$31,#$00,#$00,#$00
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; this is at (2061 dec)=($80d)
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; and it MUST be exactly after the above BASIC statement
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. = $80d
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jmp start
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#if VERBOSE = 1
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ECHO "basic.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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47
src/cart.asm
Normal file
47
src/cart.asm
Normal file
@ -0,0 +1,47 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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cartridge SUBROUTINE
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WORD #$8009
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WORD #$801a
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; CBM80 in PETSCII (cartridge signature for autostart)
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BYTE #$c3,#$c2,#$cd,#$38,#$30
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.coldstart:
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sei
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stx $d016
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jsr $fda3
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jsr $fd50
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jsr $fd15
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jsr $ff5b
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cli
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.warmstart:
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; Copy cartridge content into proper memory location
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ldx #$20
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lda #$0
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tay
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sta srcPointer
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sta dstPointer
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lda #>cartridgeStart
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sta srcPointer + 1
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lda #$08
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sta dstPointer + 1
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.loop:
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lda (srcPointer),y
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sta (dstPointer),y
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iny
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bne .loop
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inc srcPointer + 1
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inc dstPointer + 1
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dex
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bne .loop
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jmp start
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#if VERBOSE = 1
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ECHO "cart.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; Data section - Not initialized variables ($CD00 - $CDFF)
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; ----------------------------------------------------------------------
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; Number of interrupt
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@ -50,3 +54,6 @@ delayStatus:
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score:
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WORD
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#if VERBOSE = 1
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ECHO "data.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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statusPlay: ; do Game
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; Check counter
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ldx irqn
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@ -334,4 +338,6 @@ skipPauseTests:
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rts
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#if VERBOSE = 1
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ECHO "game.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; Game is over
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; ----------------------------------------------------------------------
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gameover:
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@ -21,4 +25,6 @@ gameover:
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sta status
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rts
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#if VERBOSE = 1
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ECHO "gameover.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; Initialized variables
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; ----------------------------------------------------------------------
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@ -95,3 +99,6 @@ noMoreLevelsString:
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levelsList:
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INCBIN "../res.bin/levels.bin"
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#if VERBOSE = 1
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ECHO "initdata.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; Currently statusIntro0 is the same as statusIntro1
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; statusIntro1 has just been reserved for future use
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statusIntro0:
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@ -77,4 +81,6 @@ status1okset:
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; For now, just return.
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rts
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#if VERBOSE = 1
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ECHO "intro1.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; Intro reset
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; ----------------------------------------------------------------------
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introreset:
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@ -44,4 +48,6 @@ introresetColorShade
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rts
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#if VERBOSE = 1
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ECHO "introreset.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; Reset variables for a new level
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; ----------------------------------------------------------------------
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levelresetvar:
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@ -32,3 +36,6 @@ clearListLoop:
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rts
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#if VERBOSE = 1
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ECHO "levelreset.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; load new level on the screen
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statusLevelTitle SUBROUTINE
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jsr clearScreen
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@ -162,3 +166,6 @@ writeLevelEnd:
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sta status
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rts
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#if VERBOSE = 1
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ECHO "levels.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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73
src/main.asm
73
src/main.asm
@ -15,21 +15,38 @@
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org $02
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INCLUDE "zeropage.asm"
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#if DEBUG = 1
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#if VERBOSE = 1
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; Locations $90-$FF in zeropage are used by kernal
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ECHO "End of zeropage variables. Space left: ",($90 - .)
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#endif
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; Initialized segments
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; ----------------------------------------------------------------------
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SEG constSegment
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SEG autostartSegment
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#if CARTRIDGE = 0
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org $801
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INCLUDE "basic.asm" ; BASIC must stay at this address
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INCLUDE "initdata.asm"
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#if DEBUG = 1
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ECHO "End of Initialized Data (const) + Basic Segment. Space left: ",($1000 - .)
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INCLUDE "basic.asm" ; BASIC _MUST_ stay at this address
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#else
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org $800
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INCLUDE "cart.asm"
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#endif
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INCLUDE "initdata.asm"
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; Program "Segment" Low
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; ----------------------------------------------------------------------
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; You just have to fill this empty space, don't you think so? ;-)
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INCLUDE "game.asm"
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INCLUDE "gameover.asm"
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INCLUDE "introreset.asm"
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INCLUDE "program.asm"
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INCLUDE "subroutines.asm"
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INCLUDE "levels.asm"
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INCLUDE "intro1.asm"
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; Note: some code had to be included at an higher address
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#if VERBOSE = 1
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ECHO "End of Low Program Segment. Space left:",($1000 - .)
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#endif
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; SID tune (previously properly cleaned, see HVSC)
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; ----------------------------------------------------------------------
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@ -37,8 +54,14 @@
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org $1000
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sidtune:
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INCBIN "../res.bin/amour.sid"
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#if DEBUG = 1
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ECHO "End of SIDtune. Space left: ",($2000 - .)
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#if VERBOSE = 1
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ECHO "End of SIDtune at ",.
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#endif
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INCLUDE "multicolor.asm"
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INCLUDE "levelreset.asm"
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INCLUDE "outro.asm"
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#if VERBOSE = 1
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ECHO "End of Middle Program Segment. Space left:",($2000 - .)
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#endif
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; Font Data
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@ -49,40 +72,36 @@ sidtune:
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tggsFont:
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INCLUDE "tggs.asm"
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; Include program
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; Program Segment High
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; ----------------------------------------------------------------------
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SEG programSegment
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org $2800
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jmp start
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INCLUDE "game.asm"
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INCLUDE "gameover.asm"
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INCLUDE "levelreset.asm"
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INCLUDE "introreset.asm"
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INCLUDE "intro1.asm"
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INCLUDE "multicolor.asm"
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INCLUDE "outro.asm"
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INCLUDE "program.asm"
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INCLUDE "subroutines.asm"
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INCLUDE "levels.asm"
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#if DEBUG = 1
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ECHO "End of program at: ",.,"Space left:",($cd00 - .)
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#if VERBOSE = 1
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ECHO "End of High Program Segment at: ",.,"Space left:",($cd00 - .)
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#endif
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#if DEBUG = 1
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#if VERBOSE = 1
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#if CARTRIDGE = 0
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; +2 because of PRG header
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ECHO "PRG size:",([. - $801 + 2]d),"dec"
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#else
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ECHO "BIN size:",([. - $800]d),"dec"
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#endif
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#endif
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; Uninitialized segments
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; ----------------------------------------------------------------------
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; Cartridge locations
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; -------------------
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SEG.U cartridgeSegment
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org $8000
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cartridgeStart:
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; Data variables
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; -----------------
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SEG.U dataSegment
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org $cd00
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INCLUDE "data.asm"
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# if DEBUG = 1
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#if VERBOSE = 1
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ECHO "End of Data segment. Space left:",($ce00 - .)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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processor 6502
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multicolor SUBROUTINE
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@ -39,3 +43,7 @@ multicolorOff:
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and #$ef
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sta $d016
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rts
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#if VERBOSE = 1
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ECHO "multicolor.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; Wait for some delay
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statusDelay SUBROUTINE
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ldy delay ; load outroDelay and decrement
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@ -11,3 +15,6 @@ statusDelay SUBROUTINE
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sta status
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rts
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#if VERBOSE = 1
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ECHO "outro.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; ENTRY OF PROGRAM
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; ----------------------------------------------------------------------
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start:
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@ -186,4 +190,6 @@ checkEndStatus:
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; Go to original system routine
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jmp $ea31
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#if VERBOSE = 1
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ECHO "program.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; Subroutines
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; ----------------------------------------------------------------------
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@ -161,3 +165,6 @@ nextPointer:
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rts
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#if VERBOSE = 1
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ECHO "subroutines.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -1,3 +1,7 @@
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#if VERBOSE = 1
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LASTINIT SET .
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#endif
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; char 0x0, 0
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BYTE #%00000000
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BYTE #%00000000
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@ -2558,3 +2562,7 @@
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BYTE #%11100001
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BYTE #%01010101
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BYTE #%00000000
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#if VERBOSE = 1
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ECHO "tggs.asm @ ",LASTINIT,"len:",(. - LASTINIT)
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#endif
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@ -22,6 +22,10 @@ nextPointerPointer DS 2
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; Pointer to string for strlen routine
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strlenString DS 2
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; Generic src/dst copy pointers
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srcPointer DS 2
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dstPointer DS 2
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; Note: Locations $90-$FF in zeropage are used by kernal
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