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2bd1f2f69f
kernal routine does not work, when the cursor is not at the same position where it was switched on, because when switching it on, the kernal remembers the character attribute and restores this when switching it off. So characters may get the wrong attribute. The solution is to always switch the cursor on, before switching it off. git-svn-id: svn://svn.cc65.org/cc65/trunk@4592 b7a2c559-68d2-44c3-8de9-860c34a00d81
73 lines
1.5 KiB
ArmAsm
73 lines
1.5 KiB
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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.constructor initcgetc
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.destructor donecgetc
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.import cursor
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.include "c128.inc"
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;--------------------------------------------------------------------------
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_cgetc: lda KEY_COUNT ; 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. We MUST always switch the cursor on,
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; before switching it off, because switching it off will restore the
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; character attribute remembered when it was switched on. So just switching
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; it off will restore the wrong character attribute.
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jsr CURS_SET ; Set cursor to current position
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jsr CURS_ON
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lda cursor
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bne L1
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lda #$01
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jsr CURS_OFF
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L1: lda KEY_COUNT ; Check characters again
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beq L1
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jsr CURS_OFF ; Switch cursor off, if characters available
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L2: jsr KBDREAD ; Read char and return in A
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ldx #0
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rts
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;--------------------------------------------------------------------------
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; Module constructor/destructor
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.bss
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keyvec: .res 2
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.segment "INIT"
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initcgetc:
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; Save the old vector
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lda KeyStoreVec
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sta keyvec
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lda KeyStoreVec+1
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sta keyvec+1
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; Set the new vector. I can only hope that this works for other C128
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; versions...
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lda #<$C6B7
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ldx #>$C6B7
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jmp SetVec
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.code
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donecgetc:
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lda keyvec
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ldx keyvec+1
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SetVec: sei
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sta KeyStoreVec
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stx KeyStoreVec+1
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cli
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rts
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