Re: 6522 vs 6526 (was Re: 6502 to 8501: new details)

From: Ethan Dicks (
Date: 2002-02-26 19:08:55

--- Nicolas Welte <> wrote: 
> You're right of course, the 6529 is not a common chip at all, I only used it
> as an example how small a single port I/O chip should be. The 6821 would be a
> good choice...

If anyone is interested, I have a number of NOS (New Old Stock) 6821 chips
from when I used to work at a company that built 68000-based intellegent serial
cards for VAXen and PDP-11s.  We drove an optional programmer's console with
one I/O port and a Dataproducts printer port with the other.

They work great on an 8MHz 68000, but I presume they are 1Mhz or 2Mhz chips.
Not sure at this point.

I don't think they are a discontinued chip.  If anyone is interested, contact
me off list.  They aren't getting pitched (they've been in my basement for
about 8 years), so don't fear missing out.

ISTR they are drop-in replacement for some uses of the 6520, but I haven't
done it myself.  Maybe I should check the pinout and if good, stick one in
a PET and see how the IEEE and keyboard work.


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