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in the system bank. For one this performs better (several %), second it allows to handle the function keys in conformance with other platforms. Without the custom keyboard routine, we would have to apply some more magic to the function keys to make them work as with other cc65 targets. git-svn-id: svn://svn.cc65.org/cc65/trunk@2811 b7a2c559-68d2-44c3-8de9-860c34a00d81
51 lines
1.0 KiB
ArmAsm
51 lines
1.0 KiB
ArmAsm
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; Ullrich von Bassewitz, 06.08.1998
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; char cgetc (void);
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;
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.export _cgetc
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.import plot, write_crtc
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.import cursor
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.import keyidx: zp, keybuf: zp, config: zp
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_cgetc: lda keyidx ; Get number of characters
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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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lda cursor
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beq L1 ; Jump if no cursor
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jsr plot ; Set the current cursor position
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ldy #10
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lda config ; Cursor format
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jsr write_crtc ; Set the cursor formar
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L1: lda keyidx
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beq L1
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ldy #10
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lda #$20 ; Cursor off
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jsr write_crtc
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L2: ldx #$00 ; Get index
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ldy keybuf ; Get first character in the buffer
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sei
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L3: lda keybuf+1,x ; Move up the remaining chars
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sta keybuf,x
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inx
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cpx keyidx
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bne L3
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dec keyidx
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cli
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ldx #$00 ; High byte
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tya ; First char from buffer
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rts
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