Mercurial > hg > Members > kono > nitros9-code
view lib/alib/div8x8.as @ 2811:611715587834 lwtools-port
Updated rules.mak and level1/coco1/bootfiles/makefile
Updated the rules.mak file to remove the format entire image related
to drivewire server disk images.
Updated level1/coco1/bootfiles/makefile to create 3 new bootfile images.
These images are stripped down to just the common files needed
for vovdg games on os9 level 1. These bootfiles are for becker, dw,
and arduino. Also corrected a duplicated dd descriptor when building
some bootfiles that had both floppy_40d, floppy_80d, RBDW, RBBECKER,
and RBARDUINO. Removed the dd descriptor from each of these sections
and made it where the dd descriptor for the specific section was added
in the main bootfile list.
| author | David Ladd <drencor-xeen@users.sf.net> |
|---|---|
| date | Mon, 11 Feb 2013 20:16:24 -0600 |
| parents | 03f26e88b809 |
| children |
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********************************* * 8 x 8 Divide * OTHER MODULES NEEDED: none * ENTRY: A = divisor * B = dividend * EXIT: A = remainder * B = quotient nam 8x8 bit Divide ttl Assembler Library Module section .bss negcount rmb 1 endsect section .text * Signed Divide SDIV88: clr negcount,u PSHS D tst ,s bpl testquo lda ,s coma inca sta ,s inc negcount,u testquo tst 1,s bpl ok ldd 1,s coma adda #$01 std 1,s inc negcount,u ok puls d bsr DIV88 dec negcount,u bne goforit pshs d lda ,s coma inca sta ,s lda 1,s coma inca sta 1,s puls d goforit rts DIV88: PSHS A save divisor LDA #8 bit counter PSHS A CLRA initialize remainder div1 ASLB shift dividend & quotient ROLA CMPA 1,S trial subtraction needed BLO div2 SUBA 1,S INCB div2 DEC 0,S count down # of bits BNE div1 LEAS 2,S clean up stack RTS endsect