acme version

jacme/Makefile

@@ -0,0 +1,5 @@
+jimmy.prg: jimmy.S
+	acme --color --cpu 6510 --format cbm -o $@ $<
+
+clean:
+	rm -f jimmy.prg

jacme/jimmy.S

@@ -0,0 +1,37 @@
+* = $0801			; basic bootstrap
+!byte $0c, $08, $0a, $00, $9e, $20
+!byte $34, $30, $39, $36, $00, $00
+!byte $00
+
+* = $1000			; actual progrem starts here
+
+	ldx #$08		; Screen colours
+	stx $d020
+	ldx #$00
+	stx $d021
+
+	jsr $e544		; clear screen
+	jsr print_string
+
+loop:
+	lda $dc01		; Scans the keyboard buffer
+	cmp #$ef		; If user presses Space ($ef) then quit
+	bne loop
+
+	rts
+
+print_string:
+	ldx #$00
+print_loop:
+	lda message,x
+
+	cmp #$0			; return on null terminator
+	bne print_continue
+	rts
+
+print_continue:
+	sta $0428,x
+	inx
+	jmp print_loop
+
+message !scr "welcome to scat os@"