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Fixed and improved some pce comments.

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This commit is contained in:
Greg King
2015-11-17 09:14:15 -05:00
committed by Oliver Schmidt
parent 2cc822b44e
commit 959eff34a3
15 changed files with 61 additions and 55 deletions
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15
libsrc/pce/cputc.s
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@@ -25,10 +25,10 @@ _cputc: cmp #$0D ; CR?
bne L1
lda #0
sta CURS_X
beq plot ; Recalculate pointers
beq plot ; Recalculate pointer
L1: cmp #$0A ; LF?
beq newline ; Recalculate pointers
beq newline ; Recalculate pointer
; Printable char of some sort
@@ -50,23 +50,21 @@ L3: sty CURS_X
newline:
inc CURS_Y
; Set cursor position, calculate RAM pointers
; Set cursor position; calculate VRAM pointer.
plot: ldy CURS_X
ldx CURS_Y
clc
jmp PLOT ; Set the new cursor
; Write one character to the screen without doing anything else, return X
; position in Y
; Write one character to the screen without doing anything else.
putchar:
ora RVS ; Set revers bit
tax
st0 #VDC_MAWR ; Memory Adress Write
st0 #VDC_MAWR ; Memory Address Write
lda SCREEN_PTR
sta VDC_DATA_LO
@@ -79,8 +77,7 @@ putchar:
txa
sta VDC_DATA_LO ; character
lda CHARCOLOR
lda CHARCOLOR ; pallette number
asl a
asl a
asl a