mirror of
https://github.com/cc65/cc65.git
synced 2024-11-19 06:31:31 +00:00
49 lines
1003 B
ArmAsm
49 lines
1003 B
ArmAsm
|
;
|
||
|
|
; Ullrich von Bassewitz, 06.08.1998
|
||
|
|
;
|
||
|
|
; char cgetc (void);
|
||
|
|
;
|
||
|
|
|
||
|
|
.export _cgetc
|
||
|
|
.import cursor
|
||
|
|
|
||
|
|
.include "plus4.inc"
|
||
|
|
|
||
|
|
|
||
|
|
_cgetc: lda KEY_COUNT ; Get number of characters
|
||
|
|
ora FKEY_COUNT ; Or with number of function key chars
|
||
|
|
bne L2 ; Jump if there are already chars waiting
|
||
|
|
|
||
|
|
; Switch on the cursor if needed
|
||
|
|
|
||
|
|
ldy CURS_X
|
||
|
|
lda (CRAM_PTR),y ; Get current char
|
||
|
|
pha ; And save it
|
||
|
|
lda CHARCOLOR
|
||
|
|
sta (CRAM_PTR),y
|
||
|
|
|
||
|
|
lda cursor
|
||
|
|
beq L1 ; Jump if no cursor
|
||
|
|
tya
|
||
|
|
clc
|
||
|
|
adc SCREEN_PTR
|
||
|
|
sta TED_CURSLO
|
||
|
|
lda SCREEN_PTR+1
|
||
|
|
adc #$00
|
||
|
|
sbc #$0B ; + carry = $C00 (screen address)
|
||
|
|
sta TED_CURSHI
|
||
|
|
|
||
|
|
L1: lda KEY_COUNT
|
||
|
|
ora FKEY_COUNT
|
||
|
|
beq L1
|
||
|
|
pla
|
||
|
|
sta (CRAM_PTR),y
|
||
|
|
lda #$ff
|
||
|
|
sta TED_CURSLO ; Cursor off
|
||
|
|
sta TED_CURSHI
|
||
|
|
|
||
|
|
L2: jsr KBDREAD ; Read char and return in A
|
||
|
|
ldx #0
|
||
|
|
rts
|
||
|
|
|