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23 lines
521 B
Plaintext
23 lines
521 B
Plaintext
; $Id: kprchr.mac 830 2016-12-26 20:25:49Z mueller $
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; Copyright 2013- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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; License disclaimer see License.txt in $RETROBASE directory
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;
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; synchronous (polling) console print: single character
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; Call:
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; jsr pc, kprchr
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; Arguments:
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; r0: character to be printed
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;
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; All registers preserved
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;
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XCSR = 177564
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XBUF = 177566
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kprchr: tstb @#XCSR
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bpl kprchr
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movb r0,@#XBUF
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1$: tstb @#XCSR
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bpl 1$
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rts pc
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