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annotate lib/alib/div8x8.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 * 8 x 8 Divide
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3
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4 * OTHER MODULES NEEDED: none
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5
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6 * ENTRY: A = divisor
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7 * B = dividend
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8
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9 * EXIT: A = remainder
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10 * B = quotient
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11
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12 nam 8x8 bit Divide
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13 ttl Assembler Library Module
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14
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15
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16 psect DIV88,0,0,0,0,0
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17
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18 vsect
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19 negcount rmb 1
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20 endsect
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21
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22 * Signed Divide
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23 SDIV88:
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24 clr negcount,u
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25 PSHS D
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26 tst ,s
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27 bpl testquo
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28 lda ,s
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29 coma
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30 inca
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31 sta ,s
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32 inc negcount,u
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33 testquo
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34 tst 1,s
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35 bpl ok
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36 ldd 1,s
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37 coma
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38 adda #$01
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39 std 1,s
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40 inc negcount,u
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41 ok
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42 puls d
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43 bsr DIV88
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44 dec negcount,u
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45 bne goforit
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46 pshs d
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47 lda ,s
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48 coma
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49 inca
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50 sta ,s
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51 lda 1,s
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52 coma
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53 inca
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54 sta 1,s
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55 puls d
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56 goforit
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57 rts
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58
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59
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60 DIV88:
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61 PSHS A save divisor
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62 LDA #8 bit counter
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63 PSHS A
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64 CLRA initialize remainder
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65
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66 div1
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67 ASLB shift dividend & quotient
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68 ROLA
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69 CMPA 1,S trial subtraction needed
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70 BLO div2
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71 SUBA 1,S
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72 INCB
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73
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74 div2
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75 DEC 0,S count down # of bits
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76 BNE div1
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77 LEAS 2,S clean up stack
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78 RTS
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79
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80 endsect
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81