🚀 go-pugleaf

In article <622@tuura.UUCP> risto@tuura.UUCP (Risto Lankinen) writes:
>A little experimenting with Microsoft Macro Assembler version 5.10 and
>the instructions AAM and AAD revealed a neat way to do immediate 8-bit
>MUL and DIV on 80X86:s.  The 'feature' is *ABSOLUTELY* undocumented by
>either Intel or Microsoft or any other organization associated.  Who-
>ever uses it must consider the possibility of the instructions not


Along the same note, this is what i found out....

0d4h  n             ; aam - if n = 0ah, unpack - if n = 10h  
0d5h  n             ; aad - if n = 0ah,   pack - if n = 10h

0d6h                ; lalc - load al with carry 
                                carry - al = 0ffh
                             no carry - al = 0

i came across 0d6h, by looking though my roms, ( best way to find
out how they do what they do....) and keep seeing 'db 0d6 ??'

these three i have tried on a 8088, 80286, 80386sx, my guess is 
like the 'loadall' (which MS CV disassembles ;-) are for 'INTEL' use
only... ha... loadall I can see reserving for thier testing but these
are VERY handy.  also ever notice that CV will disassemble xbts ibts
( extract bit string, insert bit string) but the 386sx can't execute
them? are these simply instructions that were going to put in & didn't,
or are they just on the 386 (haven't checked) are they there & have been 
moved?  Inquiring minds want to know...

		Jay
-- 
		Jay B. Harlow	<harlow@plains.nodak.edu>
	uunet!plains!harlow (UUCP)	harlow@plains (Bitnet)

Of course the above is personal opinion, And has no bearing on reality...