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[aprssig] Tracking and Stacking

Steve Noskowicz noskosteve at yahoo.com
Fri Sep 21 15:34:30 UTC 2007



Drifting OT , but I believe this was because the adder
was a binary adder.  When adding BCD you needed the
correction to do the decimal carry(s).  Mot chips had
the same thing.

73, Steve, K9DCI
--- Dave Baxter <dave at emv.co.uk> wrote:

> And the venerable Z80 had that too with the DAA
> instruction (Decimal
> Addust Accumulator)
> Just that you had to add that instruction after
> every addition or
> subtraction to "Adjust" the blessed thing.
> 



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