repository organization fix

.gitignore

@@ -1,3 +1,5 @@
+bin/
+build/
 *.prg
 *.out
 symbols.txt

LICENSE

@@ -0,0 +1 @@
+https://www.gnu.org/licenses/gpl-3.0.txt

Makefile

@@ -1,8 +1,20 @@
-64:
-	dasm main.asm -DSYSTEM=64 -DDEBUG=0 -osnake.prg
+.POSIX:
 
-debug:
-	dasm main.asm -DSYSTEM=64 -DDEBUG=1 -ssymbols.txt -osnake.prg
+ASM=$(wildcard src/*.asm)
+RES=$(wildcard res/*)
+
+.PHONY: debug env clean
+
+bin/snake.prg: $(ASM) $(RES) | env
+	dasm src/main.asm -Isrc/ -DSYSTEM=64 -DDEBUG=0 -obin/snake.prg
+
+clean:
+	rm -rf {build,bin}
+
+env:
+	mkdir -p {build,bin}
+
+debug: $(ASM) $(RES) | env
+	g++ -o bin/explodefont util/explodefont.cpp
+	dasm src/main.asm -Isrc/ -DSYSTEM=64 -DDEBUG=1 -sbuild/symbols.txt -obin/snake.prg
 
-16:
-	dasm main.asm -DSYSTEM=16 -osnake.prg

README.md

@@ -0,0 +1,31 @@
+# snake6502
+
+*snake6502* is a snake-like game clone for Commodore home computers, written for fun because «I always wanted to code something for a computer of my retrocomputers collection – actually, this is the main reason I collect them: to write programs».
+
+## Compile
+You need the [dasm](https://dasm-assembler.github.io/) macro assembler, then:
+```
+$ make
+```
+You can also make it output useful extra info with:
+```
+$ make debug
+```
+
+
+## Memory map
+Address               | PRG   | Description
+----------------------|-------|------------
+```$0000 - $0001```   | no    | hardware
+```$0002 - $00FF```   | no    | zero page pointers
+```$0100 - $07FF```   | no    | *free ram*
+```$0800 - $0FFF```   | yes   | data segment + BASIC autostart
+```$1000 - $1FFF```   | yes   | SID tune
+```$2000 - $27FF```   | yes   | custom char
+```$2800 - $xxxx```   | yes   | program logic (only needed part used)
+```$xxxx - $CDFF```   | no    | *free ram*
+```$CE00 - $CEFF```   | no    | list X
+```$CF00 - $CFFF```   | no    | list Y
+```$D000 - $DFFF```   | no    | I/O
+```$E000 - $FFFF```   | no    | Kernal
+

src/main.asm

@@ -9,34 +9,35 @@
     ; Commodore16 specific code
 #endif
 
-    ; Uninitialized zeropage segment
+; Uninitialized zeropage segment
+; ----------------------------------------------------------------------
     SEG.U zeropageSegment
     org $02
     INCLUDE "zeropage.asm"
 
-    ; Initialized segments
-    SEG basicSegment
-    org $801
-    INCLUDE "basic.asm"
+#if DEBUG = 1
+    ; Locations $90-$FF in zeropage are used by kernal
+    ECHO "End of zeropage variables. Space left: ",($90 - .)
+#endif
 
+; Initialized segments
+; ----------------------------------------------------------------------
     SEG dataSegment
-    org $900
+    org $801
+    INCLUDE "basic.asm" ; BASIC must stay at this address
     INCLUDE "data.asm"
     INCLUDE "const.asm"
+#if DEBUG = 1
+    ECHO "End of Data + Basic Segment. Space left: ",($1000 - .)
+#endif
 
-; List
-; ----------------------------------------------------------------------
-. = $e00
-listX:
-. = $f00
-listY:
 
 ; SID tune (previously properly cleaned, see HVSC)
 ; ----------------------------------------------------------------------
     SEG sidSegment
     org $1000
 sidtune:
-    INCBIN "amour.sid"
+    INCBIN "../res/amour.sid"
 #if DEBUG = 1
     ECHO "End of SIDtune. Space left: ",($2000 - .)
 #endif
@@ -47,7 +48,7 @@ sidtune:
     org $2000
 ; This binary data that defines the font is exactly 2kB long ($800)
 tggsFont:
-    INCBIN "tggs.font"
+    INCLUDE "tggs.asm"
 
 ; Include program
 ; ----------------------------------------------------------------------
@@ -66,9 +67,21 @@ tggsFont:
     INCLUDE "subroutines.asm"
 
 #if DEBUG = 1
-    ECHO "Program ends at: ",.
+    ECHO "End of program at: ",.,"Space left:",($ce00 - .)
 #endif
 
+#if DEBUG = 1
+    ; +2 because of PRG header
+    ECHO "PRG size:",([. - $801 + 2]d),"dec"
+#endif
+
+; Uninitialized list segment
+; ----------------------------------------------------------------------
+    SEG.U listSegment
+    org $ce00
+listX DS 256
+listY DS 256
+
 ;
 ; coded during december 2017
 ; by giomba -- giomba at glgprograms.it

src/multicolor.asm

@@ -25,21 +25,6 @@ multicolorInit:
 	cpx #$0
 	bne .tggsCopy
 
-	; Alter character definitions in RAM (using previous defined table)
-	; TODO: merge these edits with actual font binary
-	ldx #$8
-.editLoop:
-	dex
-	lda .multicolorSnakeTile,x
-	sta tggsFont + SNAKE_TILE * 8,x
-	lda .multicolorFoodTile,x
-	sta tggsFont + FOOD_TILE * 8,x
-;	lda .multicolorOtherTile,x
-;	sta tggsFont + SOME_TILE * 8,x
-;	...
-	cpx #$0
-	bne .editLoop
-
 	; Tell VIC-II to use:
 	; - screen text memory at	$400	= $400 * 1
 	; - characters ROM at		$2000	= $400 * 8
@@ -74,20 +59,3 @@ multicolorOff:
 	and #$ef
 	sta $d016
 	rts
-
-; Costants
-; ----------------------------------------------------------------------
-.multicolorCommodoreTile:
-	BYTE #$00,#$30,#$cc,#$ca,#$c0,#$c5,#$cc,#$30
-.multicolorSnakeTile:
-	BYTE #$00,#$28,#$ab,#$ab,#$ab,#$ab,#$28,#$00
-.multicolorFoodTile:
-	BYTE #%00010101
-	BYTE #%10010101
-	BYTE #%10010101
-	BYTE #%10010101
-	BYTE #%10101000
-	BYTE #%00100000
-	BYTE #%00100000
-	BYTE #%10000000
-

src/zeropage.asm

@@ -1,4 +1,4 @@
-; Zero page utilities
+; Zero page utility pointers
 ; ----------------------------------------------------------------------
 ; Where is the snake head in video memory? Do math to calculate address
 ; using pointer at tileMem,tileMem+1
@@ -9,12 +9,9 @@ printStatusString DS 2
 
 ; Pointer to intro string
 printIntroString DS 2
-; Pointer to screen position where to print intro string ($fb-$fc)
+; Pointer to screen position where to print intro string
 introScreenStart DS 2
 
-#if DEBUG = 1
-    ; Locations $90-$FF in zeropage are used by kernal
-    ECHO "End of zeropage variables. Space left: ",($90 - .)
-#endif
+; Note: Locations $90-$FF in zeropage are used by kernal
 
 

util/explodefont.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+    int count = 0;
+
+    while (cin.good()) {
+        char c;
+        cin.get(c);
+        if (! cin.good()) break;
+
+        if (count % 8 == 0) {
+            cout << "; character " << count / 8 << endl;
+        }
+        cout << "   BYTE #%";
+        for (int i = 7; i >= 0; --i) {
+            cout << ((c >> i) & 1);
+        }
+        cout << endl;
+
+        if (count % 8 == 7) {
+            cout << endl;
+        }
+
+        count++;
+    }
+
+    return 0;
+}