RCA 1802s available

[crufta cat]

Ethan,

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..

Allison

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
>