RCA 1802s available

crufta cat ucespamdump at gmail.com
Wed Dec 18 14:52:03 CST 2019


I've used parts with 1976 date code at 4mhz and higher.
Later part with early 80s date codes and intersils part have been
over clocked to well over 8mhz and many.  I have a few mid 80s
part that have given no issues at 5mhz though it never occurred
to me to push further.  I recently got a few 1806s that clock at 8mhz
without issues.

I always thought they were low but never pushed.  When I did
they ran a bit quite faster than expected..


On Wed, Dec 18, 2019 at 3:26 AM Ethan Dicks via cctalk <
cctalk at classiccmp.org> wrote:

> On Wed, Dec 18, 2019 at 2:55 AM Al Kossow via cctalk
> <cctalk at classiccmp.org> wrote:
> > On 12/17/19 9:30 AM, Will Cooke via cctalk wrote:
> > > An ad was emailed to me today with an interesting item:  RCA 1802
> processors.
> >
> > Not a bad price, did you buy any?
> Definitely a good buy if you don't need to go faster than 3.2MHz with
> +5V Vcc (I have at least one 1802 board with a socketed oscillator so
> I can use an NTSC colorburst crystal (3.579545 MHz) on a divide-by-2
> to run at 1.7897725 MHz for use with a CDP1861 "Pixie" video chip, or
> swap that out for a 5Mhz or 6Mhz crystal for faster operation).  The
> CDP1802BC can go up to 5MHz with a 10MHz oscillator on the same board.
> > Were they actually RCA-branded parts from the 70's?
> Curious to know too but I'd expect a Harris part just because of
> general availability.
> -ethan

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