mirror of https://github.com/cc65/cc65.git
120 lines
2.5 KiB
ArmAsm
120 lines
2.5 KiB
ArmAsm
;
|
|
; Written by Groepaz/Hitmen <groepaz@gmx.net>
|
|
; Cleanup by Ullrich von Bassewitz <uz@cc65.org>
|
|
;
|
|
; void cputcxy (unsigned char x, unsigned char y, char c);
|
|
; void cputc (char c);
|
|
;
|
|
|
|
.export _cputcxy, _cputc, cputdirect, putchar
|
|
.export newline
|
|
.constructor initconio
|
|
.import popa, _gotoxy
|
|
.import setcursor
|
|
|
|
.importzp tmp3,tmp4
|
|
|
|
.include "creativision.inc"
|
|
.include "boxchars.inc"
|
|
|
|
;-----------------------------------------------------------------------------
|
|
|
|
.code
|
|
|
|
_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 CURSOR_X
|
|
beq plot ; Recalculate pointers
|
|
|
|
L1: cmp #$0A ; LF?
|
|
beq newline ; Recalculate pointers
|
|
|
|
; Printable char of some sort
|
|
|
|
cputdirect:
|
|
jsr putchar ; Write the character to the screen
|
|
|
|
; Advance cursor position
|
|
|
|
advance:
|
|
ldy CURSOR_X
|
|
iny
|
|
cpy #SCREEN_COLS
|
|
bne L3
|
|
inc CURSOR_Y ; new line
|
|
ldy #0 ; + cr
|
|
L3: sty CURSOR_X
|
|
jmp plot
|
|
|
|
newline:
|
|
inc CURSOR_Y
|
|
|
|
; Set cursor position, calculate RAM pointers
|
|
|
|
plot: ldy CURSOR_X
|
|
ldx CURSOR_Y
|
|
jmp setcursor ; Set the new cursor
|
|
|
|
|
|
; Write one character to the screen without doing anything else, return X
|
|
; position in Y
|
|
|
|
putchar:
|
|
cmp #$5B
|
|
bcc IS_UPPER
|
|
|
|
clc
|
|
sbc #$1F
|
|
|
|
IS_UPPER:
|
|
cmp #$20
|
|
bcc BAD_CHAR
|
|
|
|
pha
|
|
lda SCREEN_PTR
|
|
sei
|
|
sta VDP_CONTROL_W
|
|
lda SCREEN_PTR+1
|
|
ora #$40
|
|
sta VDP_CONTROL_W
|
|
pla
|
|
clc
|
|
adc #160
|
|
sta VDP_DATA_W
|
|
cli
|
|
|
|
BAD_CHAR:
|
|
jmp plot
|
|
|
|
initconio:
|
|
lda #$0
|
|
sta SCREEN_PTR
|
|
lda #$10
|
|
sta SCREEN_PTR+1
|
|
|
|
; Copy box characters to slot
|
|
sei
|
|
lda #08
|
|
sta VDP_CONTROL_W
|
|
lda #$46
|
|
sta VDP_CONTROL_W
|
|
ldx #0
|
|
|
|
LL: lda boxchars,x
|
|
sta VDP_DATA_W
|
|
inx
|
|
cpx #48
|
|
bne LL
|
|
|
|
cli
|
|
jmp plot
|