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22 lines
725 B
Plaintext
22 lines
725 B
Plaintext
; $Id: kprstr.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 $RETROBASE directory
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;
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; synchronous (polling) console print: print 0-terminated string
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; Call:
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; jsr pc, kprstr
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; Arguments:
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; r0: pointer to 0-terminated string
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;
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; r1-r5 registers preserved
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;
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kprstr: mov r1,-(sp) ; save r1
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mov r0,r1 ; r1 now ptr to string
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1$: movb (r1)+,r0 ; get next char
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beq 2$ ; quit if 0 char
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jsr pc,kprchr ; otherwise print char
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br 1$ ; go for next char
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2$: mov (sp)+,r1 ; restore r1
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rts pc
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