Attention 1802 fans...

From: Ross Archer <archer_at_topnow.com>
Date: Tue Oct 1 19:02:00 2002

Ethan Dicks wrote:
>
> --- Ross Archer <archer_at_topnow.com> wrote:
> > I suppose if e-bay prices go high enough for the chips, you
> > can always launch a mission to recover one of those sats for
> > the chip salvage. ;)
>
> They haven't been out of production that long, if indeed they
> _are_ out of production. I bought some Harris 1802 processors,
> new, in 1999.

WOW.

One thing for still producing the chip: I bet they've
amortized the
development cost by now. :)

Have they cranked up the clock rates or made any
improvements,
do you know? I know you can get a WDC 6502 that runs at 14
Mhz, (I'm
running one at 6 Mhz and it isn't too shabby, speedwise, but
I had
to screen a fair batch of 6522s and 65C51s to get ones that
operated
reliably at this bus speed), so maybe there's a 200 Mhz 1802
out there? ;)


> Besides, I'd like to see anyone recover Voyager 1 and 2. :-)

That would be one heckuva road-trip. I was being silly of
course.
If you needed an 1802 for an existing design badly enough,
and couldn't buy a new one, you could undoubtedly
create a clone of it on an FPGA on a little PCB and a 40-pin
DIP header. It can't be a lot of complexity as 8 bitters
go.

>
> > No doubt at any rate the 1802 was interesting and unique.
>
> Agreed.

Another thing I recall is it was one of the few micros I
knew of at the
time that provided for easy tri-stating to take control of
the bus,
such as for DMA or even multiprocessing. Another legacy of
being
CMOS, I suspect.

-- Ross



>
> -ethan
>
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Received on Tue Oct 01 2002 - 19:02:00 BST

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