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Fixed bugs; and, improved the efficiency of some pce library functions.

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This commit is contained in:
Greg King
2015-11-26 15:06:20 -05:00
committed by Oliver Schmidt
parent 959eff34a3
commit 39694d0aaa
16 changed files with 158 additions and 229 deletions
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49
libsrc/pce/cputc.s
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@@ -5,6 +5,7 @@
.export _cputcxy, _cputc, cputdirect, putchar
.export newline, plot
.forceimport initconio ; force conio initiation
.import gotoxy
.import PLOT
@@ -23,9 +24,8 @@ _cputcxy:
_cputc: cmp #$0D ; CR?
bne L1
lda #0
sta CURS_X
beq plot ; Recalculate pointer
stz CURS_X
bra plot ; Recalculate pointer
L1: cmp #$0A ; LF?
beq newline ; Recalculate pointer
@@ -35,20 +35,16 @@ L1: cmp #$0A ; LF?
cputdirect:
jsr putchar ; Write the character to the screen
; Advance cursor position
; Move the cursor (rightwards) to the next position.
advance:
ldy CURS_X
iny
cpy xsize
bne L3
jsr newline ; new line
ldy #0 ; + CR
inc CURS_Y ; new line
cly ; + CR
L3: sty CURS_X
jmp plot
newline:
inc CURS_Y
; Set cursor position; calculate VRAM pointer.
@@ -57,24 +53,22 @@ plot: ldy CURS_X
clc
jmp PLOT ; Set the new cursor
newline:
inc CURS_Y
bra plot
; Write one character to the screen without doing anything else.
putchar:
ora RVS ; Set revers bit
ora RVS ; Set reverse bit
tax
st0 #VDC_MAWR ; Memory-Address Write
ldy SCREEN_PTR
ldx SCREEN_PTR+1
sty VDC_DATA_LO
stx VDC_DATA_HI
st0 #VDC_MAWR ; Memory Address Write
lda SCREEN_PTR
sta VDC_DATA_LO
lda SCREEN_PTR+1
sta VDC_DATA_HI
st0 #VDC_VWR ; VWR
txa
st0 #VDC_VWR
sta VDC_DATA_LO ; character
lda CHARCOLOR ; pallette number
@@ -82,14 +76,7 @@ putchar:
asl a
asl a
asl a
ora #$02
ora #>$0200 ; high nybble of char. index
sta VDC_DATA_HI
rts
;-------------------------------------------------------------------------------
; force the init constructor to be imported
.import initconio
conio_init = initconio