This commit is contained in:
2019-04-02 07:00:06 +11:00
parent e1c4d0c334
commit 28d570fd25
2 changed files with 1 additions and 38 deletions

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@@ -1,4 +1,4 @@
jimmy.prg: jimmy.S
jimmy.prg: jimmy.s
acme --color --cpu 6510 --format cbm -o $@ $<
clean:

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@@ -1,37 +0,0 @@
* = $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@"