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annotate lib/alib/is_cntrl.a @ 2765:0bd16cca86b7

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Updated rules.mak for all the os9 format's to format the entire disk. People were having some issues with the disk images not being formatted to their full capacity and preventing some functions from working.
author drencor-xeen
date Thu, 17 Jan 2013 11:03:26 -0600
parents 7d70b7e1cb21
children aaba193af04f
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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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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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31 endsect
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