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;
; 2003-04-13, Ullrich von Bassewitz
; 2014-09-04, Greg King
;
; char cgetc (void);
;
.export _cgetc
.import cursor
.forceimport disable_caps
.include "atmos.inc"
; ------------------------------------------------------------------------
;
.proc _cgetc
lda KEYBUF ; Do we have a character?
bmi @L2 ; Yes: Get it
; No character, enable cursor and wait
lda cursor ; Should cursor be off?
beq @L1 ; Skip if so
lsr STATUS
sec ; Cursor ON
rol STATUS
@L1: lda KEYBUF
bpl @L1
; If the cursor was enabled, disable it now
ldx cursor
beq @L2
dec STATUS ; Clear bit zero
; We have the character, clear the "available" flag
@L2: and #$7F ; Mask out avail flag
sta KEYBUF
ldx #>$0000
ldy MODEKEY
cpy #FUNCTKEY
bne @L3
ora #$80 ; FUNCT-key pressed
; Done
@L3: rts
.endproc
|
