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