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fix_autostart_square() now preserves X register correctly

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Irmen de Jong 2022-12-14 00:57:54 +01:00
parent def7e87151
commit 8ab47d3321
1 changed files with 5 additions and 2 deletions
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7
compiler/res/prog8lib/cx16/textio.p8
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@ -21,12 +21,13 @@ sub home() {
txt.chrout(19)
}
sub fix_autostart_square() {
asmsub fix_autostart_square() {
; Here's a possible work around for weird issue that prints a black character after first call to c64.PLOT()
; if you're also using c64.CINT() yourself. The default prog8 program initialization (which calls CINT) already performs this workaround.
; The problem occurs when a program is autostarded in the emulator with -run -prg test.prg,
; or when the program is saved as AUTOBOOT.X16 and loaded on boot like that.
%asm {{
phx
sec
jsr c64.PLOT
clc
@ -34,7 +35,9 @@ sub fix_autostart_square() {
lda #' '
jsr c64.CHROUT ; overwrite the black square
clc
jmp c64.PLOT ; cursor back to original position
jsr c64.PLOT ; cursor back to original position
plx
rts
}}
}