mirror of
https://github.com/cc65/cc65.git
synced 2024-09-07 09:54:35 +00:00
118 lines
2.9 KiB
ArmAsm
118 lines
2.9 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 newline, plot
|
|
.import popa, _gotoxy
|
|
|
|
.include "c1p.inc"
|
|
.include "extzp.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 #$0A ; CR?
|
|
bne L1
|
|
lda #0
|
|
sta CURS_X
|
|
beq plot ; Recalculate pointers
|
|
|
|
L1: cmp #$0D ; LF?
|
|
beq newline ; Recalculate pointers
|
|
|
|
; Printable char of some sort
|
|
|
|
; cmp #' '
|
|
; bcc cputdirect ; Other control char < 0x20
|
|
; tay
|
|
; bmi L10
|
|
; cmp #$60
|
|
; bcc L2
|
|
; and #$DF
|
|
; bne cputdirect ; Branch always
|
|
;L2: and #$3F
|
|
|
|
cputdirect:
|
|
jsr putchar ; Write the character to the screen
|
|
|
|
; Advance cursor position
|
|
|
|
advance:
|
|
cpy SCR_LINELEN ; xsize-1
|
|
bne L3
|
|
jsr newline ; new line
|
|
ldy #$FF ; + cr
|
|
L3: iny
|
|
sty CURS_X
|
|
rts
|
|
|
|
newline:
|
|
lda SCR_LINELEN ; xsize-1
|
|
sec ; Account for -1 above
|
|
adc SCREEN_PTR
|
|
sta SCREEN_PTR
|
|
bcc L4
|
|
inc SCREEN_PTR+1
|
|
L4: inc CURS_Y
|
|
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
|
|
|
|
|
|
|
|
; Set cursor position, calculate RAM pointers
|
|
|
|
plot: ldy CURS_Y
|
|
lda ScrLo,y
|
|
sta SCREEN_PTR
|
|
lda ScrHi,y
|
|
; ldy SCR_LINELEN
|
|
; cpy #40+1
|
|
; bcc @L1
|
|
; asl SCREEN_PTR ; 80 column mode
|
|
; rol a
|
|
;@L1: ora #$80 ; Screen at $8000
|
|
sta SCREEN_PTR+1
|
|
rts
|
|
|
|
|
|
; Write one character to the screen without doing anything else, return X
|
|
; position in Y
|
|
|
|
putchar:
|
|
; ora RVS ; Set revers bit
|
|
ldy CURS_X
|
|
sta (SCREEN_PTR),y ; Set char
|
|
rts
|
|
|
|
; Screen address tables - offset to real screen
|
|
|
|
.rodata
|
|
|
|
ScrLo: .byte $83, $A3, $C3, $E3, $03, $23, $43, $63
|
|
.byte $83, $A3, $C3, $E3, $03, $23, $43, $63
|
|
.byte $83, $A3, $C3, $E3, $03, $23, $43, $63
|
|
.byte $83
|
|
|
|
ScrHi: .byte $D0, $D0, $D0, $D0, $D1, $D1, $D1, $D1
|
|
.byte $D1, $D1, $D1, $D1, $D2, $D2, $D2, $D2
|
|
.byte $D2, $D2, $D2, $D2, $D3, $D3, $D3, $D3
|
|
.byte $D3
|