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29 lines
581 B
ArmAsm
29 lines
581 B
ArmAsm
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; 1999-06-03, Ullrich von Bassewitz
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; 2021-01-12, Greg King
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;
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; unsigned char cbm_k_readst (void);
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;
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; This version works around a bug in VIC-20 Kernal's READST function.
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;
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.include "vic20.inc"
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.include "../cbm/cbm.inc"
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.export _cbm_k_readst
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_cbm_k_readst:
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ldx #>$0000
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lda DEVNUM
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cmp #CBMDEV_RS232
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beq @L1
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jmp READST
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; Work-around: Read the RS-232 status variable directly.
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@L1: lda RSSTAT
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stx RSSTAT ; reset the status bits
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rts
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