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annotate lib/alib/bin_asc.a @ 2639:283433fa565c

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Added notes to atari.d
author Boisy Pitre <boisy.pitre@nuance.com>
date Tue, 28 Feb 2012 09:26:09 -0600
parents 7d70b7e1cb21
children aaba193af04f
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1 ******************************************
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2
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3 * Binary word to ASCII string conversion
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4
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5 * OTHER MODULES NEEDED: none
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6
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7 * ENTRY: D = binary value
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8 * X = buffer for 16 bit number
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9
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10 * EXIT: all registers (except cc) preserved
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11
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12 nam Convert # to Ascii String
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13 ttl Assembler Library Module
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15
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16 psect BIN_ASC,0,0,0,0,0
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17
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18 BIN_ASC:
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19 pshs a,b,x save registers
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20 pshs a,b save data again
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21 ldb #16 total bits to convert
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22 andcc #%11111110 clear CARRY to start
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23
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24 binas1
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25 lda #'0 get ASCII 0
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26 rol 1,S get hi bit in LSB to carry
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27 rol ,S and into MSB; is it 1 or 0?
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28 bcc binas2 0, skip
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29 inca get ASCII 1
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30
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31 binas2
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32 sta ,x+ put it in the buffer
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33 decb done all bits?
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34 bne binas1 no, loop
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35 clr ,x mark end of string
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36 leas 2,s clean up
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37 puls a,b,x,pc restore & return
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38
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39 endsect
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