Keep DAA! (was Re: 8086 bugs)

[Christian Corti]

On Sun, 11 Dec 2005, Dave Dunfield wrote:
> After looking at what I posted in my previous response, I realized that I
> could do the adjustments in single instructions by alternating ACI and
> SBI instructions - took a little bit of head scratching to work through the
> carries and come up with the right numbers, however this little sequence
> will do it in only 8 instructions (plus the ANI 15 which isn't really part of
> the algorithm if you need it):
>
>    ANI  $0F
>
>    ADI  $F6
>    ACI  $0A
>    SBI  $09
>    SBI  $F5
>    ACI  $F6
>    ACI  $0A
>    SBI  $09
>    SBI  $C5

These are 9 instructions taking 18 bytes.
How about this:
 	SET R1,#$F0
 	LBI R2,#$F9
 	SLE R1,R2
 	SUB R1,#$39
Four instructions, eight bytes, EBCDIC character as output! Now guess what 
machine this is for. Hint: the machine has no flags and no stack.

Christian