C64: ROM cartridge support

.gitignore

@@ -19,6 +19,7 @@ examples/lunix/
 
 # compiled Millfork files
 *.prg
+*.crt
 *.seq
 *.asm
 *.lbl

docs/lang/preprocessor.md

@@ -70,6 +70,8 @@ The following features are defined based on the chosen CPU and compilation optio
 
 * `CBM_64` – 1 if the target is an 8-bit Commodore computer compatible with Commodore 64, 0 otherwise
 
+* `CBM_64_CRT` – 1 if the target is a cartridge for Commodore 64, 0 otherwise
+
 * `CBM_264` – 1 if the target is an 8-bit Commodore computer from the 264 line, 0 otherwise
 
 * `KEYBOARD` – 1 if the target has a keyboard, 0 otherwise

examples/c64/softscroll.mfk

@@ -5,6 +5,13 @@ const byte row = 15
 byte letter_index
 
 void main () {
+#if CBM_64_CRT
+    vic_bg_color0 = blue
+    vic_border = light_blue
+    vic_cr1 = $9b
+    vic_mem = $15
+    vic_cr2 = $c8
+#endif
     letter_index = 0
     disable_irq()
     init_screen()

include/c64_crt16k.ini

@@ -0,0 +1,41 @@
+; Commodore 64
+; 16K ROM cartridge
+
+[compilation]
+arch=nmos
+encoding=petscii
+screen_encoding=petscr
+modules=c64_hardware,loader_c64crt,c64_kernal,c64_panic,stdlib
+ro_arrays=true
+
+
+[allocation]
+zp_pointers=2-$ff
+segments=default,prgrom
+default_code_segment=prgrom
+segment_default_start=$800
+segment_default_end=$7fff
+segment_prgrom_start=$8000
+segment_prgrom_end=$bfff
+
+[define]
+CBM=1
+CBM_64=1
+MOS_6510=1
+WIDESCREEN=1
+KEYBOARD=1
+JOYSTICKS=2
+HAS_BITMAP_MODE=1
+CBM_64_CRT=1
+
+[output]
+style=single
+format =$43,$36,$34,$20,$43,$41,$52,$54,$52,$49,$44,$47,$45,$20,$20,$20, \
+        0,0,0,$40, 1,0, 0,0, 0, 0, 0,0,0,0,0,0, \
+        $4d,$49,$4c,$4c, $46,$4f,$52,$4b, $20,$31,$36,$4b, $20,$50,$52,$4f, \
+        $47,$52,$41,$4d, 0,0,0,0, 0,0,0,0, 0,0,0,0, \
+        $43,$48,$49,$50, 0,0,$40,$10, 0,0, 0,0, $80,$00, $40,$00, \
+        prgrom:$8000:$bfff
+extension=crt
+
+

include/c64_crt8k.ini

@@ -0,0 +1,41 @@
+; Commodore 64
+; 8K ROM cartridge
+
+[compilation]
+arch=nmos
+encoding=petscii
+screen_encoding=petscr
+modules=c64_hardware,loader_c64crt,c64_kernal,c64_panic,stdlib
+ro_arrays=true
+
+
+[allocation]
+zp_pointers=2-$ff
+segments=default,prgrom
+default_code_segment=prgrom
+segment_default_start=$800
+segment_default_end=$7fff
+segment_prgrom_start=$8000
+segment_prgrom_end=$9fff
+
+[define]
+CBM=1
+CBM_64=1
+MOS_6510=1
+WIDESCREEN=1
+KEYBOARD=1
+JOYSTICKS=2
+HAS_BITMAP_MODE=1
+CBM_64_CRT=1
+
+[output]
+style=single
+format =$43,$36,$34,$20,$43,$41,$52,$54,$52,$49,$44,$47,$45,$20,$20,$20, \
+        0,0,0,$40, 1,0, 0,0, 0, 1, 0,0,0,0,0,0, \
+        $4d,$49,$4c,$4c, $46,$4f,$52,$4b, $20,$38,$4b,$20, $50,$52,$4f,$47, \
+        $52,$41,$4d,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, \
+        $43,$48,$49,$50, 0,0,$20,$10, 0,0, 0,0, $80,$00, $20,$00, \
+        prgrom:$8000:$9fff
+extension=crt
+
+

include/loader_c64crt.mfk

@@ -0,0 +1,10 @@
+segment(prgrom)
+array __vectors @$8000 = [
+    main.addr.lo,
+    main.addr.hi,
+    main.addr.lo,
+    main.addr.hi
+]
+
+segment(prgrom)
+array __boot_signature @$8004 = [$C3, $C2, $CD, $38, $30]