mirror of
https://github.com/cc65/cc65.git
synced 2024-12-26 08:32:00 +00:00
53dd513176
which included commits to RCS files with non-trunk default branches. git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
103 lines
1.8 KiB
ArmAsm
103 lines
1.8 KiB
ArmAsm
;
|
|
; Ullrich von Bassewitz, 06.08.1998
|
|
;
|
|
; void cputcxy (unsigned char x, unsigned char y, char c);
|
|
; void cputc (char c);
|
|
;
|
|
|
|
.export _cputcxy, _cputc, cputdirect, putchar
|
|
.export advance, newline, plot
|
|
.exportzp CURS_X, CURS_Y
|
|
.import _gotoxy
|
|
.import popa
|
|
.import xsize, revers
|
|
|
|
.include "cbm610.inc"
|
|
.include "zeropage.inc"
|
|
.include "../cbm/cbm.inc"
|
|
|
|
_cputcxy:
|
|
pha ; Save C
|
|
jsr popa ; Get Y
|
|
jsr _gotoxy ; Set cursor, drop x
|
|
pla ; Restore C
|
|
|
|
; Plot a character - also used as internal function
|
|
|
|
_cputc: cmp #$0D ; CR?
|
|
bne L1
|
|
lda #0
|
|
sta CURS_X
|
|
beq plot ; Recalculate pointers
|
|
|
|
L1: cmp #$0A ; LF?
|
|
bne L2
|
|
ldy CURS_Y
|
|
iny
|
|
bne newline ; Recalculate pointers
|
|
|
|
; Printable char of some sort
|
|
|
|
L2: cmp #' '
|
|
bcc cputdirect ; Other control char
|
|
tay
|
|
bmi L10
|
|
cmp #$60
|
|
bcc L3
|
|
and #$DF
|
|
bne cputdirect ; Branch always
|
|
L3: and #$3F
|
|
|
|
cputdirect:
|
|
jsr putchar ; Write the character to the screen
|
|
|
|
; Advance cursor position
|
|
|
|
advance:
|
|
iny
|
|
cpy xsize
|
|
bne L9
|
|
ldy #0 ; new line
|
|
newline:
|
|
clc
|
|
lda xsize
|
|
adc CharPtr
|
|
sta CharPtr
|
|
bcc L4
|
|
inc CharPtr+1
|
|
L4: inc CURS_Y
|
|
L9: sty CURS_X
|
|
rts
|
|
|
|
; Handle character if high bit set
|
|
|
|
L10: and #$7F
|
|
cmp #$7E ; PI?
|
|
bne L11
|
|
lda #$5E ; Load screen code for PI
|
|
bne cputdirect
|
|
L11: ora #$40
|
|
bne cputdirect ; Branch always
|
|
|
|
; Set cursor position, calculate RAM pointers
|
|
|
|
plot: ldy CURS_X
|
|
ldx CURS_Y
|
|
clc
|
|
jmp PLOT
|
|
|
|
; Write one character to the screen without doing anything else, return X
|
|
; position in Y
|
|
|
|
putchar:
|
|
ldx IndReg
|
|
ldy #$0F
|
|
sty IndReg
|
|
ora revers ; Set revers bit
|
|
ldy CURS_X
|
|
sta (CharPtr),y ; Set char
|
|
stx IndReg
|
|
rts
|
|
|
|
|