This commit is contained in:
2019-04-02 09:50:09 +11:00
parent 28d570fd25
commit f664e2b7cc

View File

@@ -10,22 +10,22 @@
stx bgcol stx bgcol
jsr $e544 ; clear screen jsr $e544 ; clear screen
;lda < message ; print message
;pha
;lda > message
;pha
jsr print_string
;pla
;pla
ldx #$01 ; start triangle wave lda #< message ; print message
ldy #$11 pha
stx ch1_freq_hi lda #> message
sty ch1_freq_lo pha
ldx #$11 jsr print_string
stx ch1_ctl pla
pla
;ldx #$01 ; start triangle wave
;ldy #$11
;stx ch1_freq_hi
;sty ch1_freq_lo
;ldx #$11
;stx ch1_ctl
.loop .loop
inc bdcol inc bdcol
@@ -39,11 +39,14 @@
rts rts
print_string: print_string:
;lda message tsx
;sta PSL + 2 dex
;lda > message lda stack, x
;sta PSL + 1 sta PSL + 1
dex
lda stack, x
sta PSL + 2
ldx #$00 ldx #$00
PSL lda message, x PSL lda message, x
cmp #$0 ; return on null terminator cmp #$0 ; return on null terminator