Legacy apps in Windows/OS X was Re: Old MS-DOS & Win Software
bfranchuk at jetnet.ab.ca
Thu Dec 8 18:18:57 CST 2005
Jim Leonard wrote:
> Is this "half-carry" flag addressable, or is it just something
> internal? A quick gander at 808x flags doesn't show a "half-carry"
> flag, unless I'm missing something obvious.
The flag only works half the time, that is why it not listed. :)
Looking at a 386 programming book, it is AF -- auxiliary carry.
Now what I still want to know is a real way to calculate the speed
of the 8086 other than it often a lot slower than the best timing
they give in the opcode tables.
Ben alias Woodelf
PS. Wee don't need no stupid carry flag, a link bit works fine.
(At least on the computer I am building a toggled link is better than a
Wee don't need DAA that what the big valve mainframes are for.
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