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annotate lib/alib/mult16x8.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 * 16 x 8 Multiply (24 bit result)
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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: A = multiplier
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8 * X = multiplicand
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9
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10 * EXIT: A = product byte 1
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11 * X = product bytes 2 & 3
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12
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13 nam 16x8 bit Multiply
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14 ttl Assembler Library Module
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16
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17 psect MULT168,0,0,0,0,0
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19 MULT168:
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20 PSHS A,X save numbers
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21 LEAS -3,S room for product
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22 LDB 5,S get lsb of multiplicand
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23 MUL
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24 STD 1,S save partial product
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25 LDD 3,S get mupltiplier & msb of multp.
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26 MUL
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27 ADDB 1,S add lsb to msb
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28 ADCA #0 add carry
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29 STD 0,S save sum of partial products
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30 LDX 1,S get 2 lsb's
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31 LEAS 6,S clean stack
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32 RTS
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33
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34 endsect
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