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Used I/O mirror locations that avoid (redirected) zero-page accesses.

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This commit is contained in:
Greg King
2015-09-29 12:39:58 -04:00
committed by Oliver Schmidt
parent c39d07dd17
commit 203200e259
6 changed files with 17 additions and 15 deletions
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4
libsrc/pce/clrscr.s
View File

@@ -16,9 +16,9 @@ rowloop:
ldx #$80
colloop:
lda #' '
sta a:VDC_DATA_LO
sta VDC_DATA_LO
lda #$02
sta a:VDC_DATA_HI
sta VDC_DATA_HI
dex
bne colloop

4
libsrc/pce/conio.s
View File

@@ -90,8 +90,8 @@ charloop:
lineloop:
lda (ptr1)
eor tmp1
sta a:VDC_DATA_LO ; bitplane 0
stz a:VDC_DATA_HI ; bitplane 1
sta VDC_DATA_LO ; bitplane 0
stz VDC_DATA_HI ; bitplane 1
clc ; increment font pointer
lda ptr1

8
libsrc/pce/cputc.s
View File

@@ -69,15 +69,15 @@ putchar:
st0 #VDC_MAWR ; Memory Adress Write
lda SCREEN_PTR
sta a:VDC_DATA_LO
sta VDC_DATA_LO
lda SCREEN_PTR + 1
sta a:VDC_DATA_HI
sta VDC_DATA_HI
st0 #VDC_VWR ; VWR
txa
sta a:VDC_DATA_LO ; character
sta VDC_DATA_LO ; character
lda CHARCOLOR
@@ -87,7 +87,7 @@ putchar:
asl a
ora #$02
sta a:VDC_DATA_HI
sta VDC_DATA_HI
rts

2
libsrc/pce/irq.s
View File

@@ -32,7 +32,7 @@ IRQStub:
; Save the display-source flags (and, release the interrupt).
;
ldy a:VDC_CTRL
ldy VDC_CTRL
sty vdc_flags
ldy #<(__INTERRUPTOR_COUNT__ * 2)

4
libsrc/pce/vdc.s
View File

@@ -7,7 +7,7 @@ HIRES = 1
.export vdc_init
vdc_init:
lda a:VDC_CTRL
lda VDC_CTRL
VREG $00, $0000 ; MAWR
VREG $01, $0000 ; MARR
@@ -37,5 +37,5 @@ vdc_init:
.endif
lda a:VDC_CTRL
lda VDC_CTRL
rts