Date   : Mon, 16 Oct 1989 16:59:45 GMT
From   : oliveb!mipos3!cadev5!dbraun@apple.com (Doug Braun ~)
Subject: Z80 Algorithms

In article <8910132000.AA03993@rom.ecse.rpi.edu> black@ROM.ECSE.RPI.EDU
(Jerry Glomph Black) writes:

>  (Jurjen N.E. Bos) writes:
>>Maybe somebody is interested in this: I can multiply to unsigned 8-bit
numbers
>>in 158 clockcycles.  . . .
>
>Big deal! Use a 64180 (aka Z180) chip, has the MLT instruction, takes 17
>clock cycles, or 1.85 micro seconds.  (By the way: it's a 2-byte instruction)
>
>Jerry Glomph Black, 8-bit terrorist


Bigger deal!! Use a Z280 and do *16* bit multiplies (signed AND unsigned)
in 25 or so clcok cycles.  Also divide! (32 bits / 16 bits).
Also 2-byte instructions.  Unless you want to do something like:
       HL := DEHL DIV (IX+2345H)


Doug Braun                             Intel Corp CAD
                                       408 765-4279

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 or:

 dbraun@cadev4.intel.com


End of INFO-CPM Digest V89 Issue #187
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