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annotate lib/alib/is_cntrl.a @ 2474:7d70b7e1cb21

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Moved net and alib files into here
author boisy
date Tue, 30 Mar 2010 02:44:42 +0000
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children aaba193af04f
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2474
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1 *****************************************
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2
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3 * See if character in "B" is a control character
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4 * controls are defined as $00..$1F and $7F+
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5
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6 * OTHER MODULES NEEDED: none
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7
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8 * ENTRY: B=character to test
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9
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10 * EXIT: CC zero=1 if control, 0 if not
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11
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12 nam Is Char a Control?
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13 ttl Assembler Library Module
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16 psect IS_CNTRL,0,0,0,0,0
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19 IS_CNTRL:
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20 cmpb #$7f
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21 bhs yes
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22 cmpb #$1f
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23 bhi exit not control, zero cleared
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24
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25 yes
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26 orcc #%00000100 set zero
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27
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28 exit
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29 rts
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30
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31 endsect
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