"New" PDP-8

From: Allison <ajp166_at_bellatlantic.net>
Date: Wed Apr 3 08:05:46 2002

From: Ethan Dicks <erd_6502_at_yahoo.com>

>The EPROMs themselves are not worth recycling (from the standpoint that
>they are more valuable with DM firmware than as ordinary blanks). The
>contents might be worth archving (not that they aren't already). I was....
SNIP>>>

I wasn't suggesting they had significant value but did point out they were
at least removeable and therefor usable.

>The UARTs are 6402s, right? Not an uncommon chip outside of the Wintel
>world. Still available in quantity, AFAIK.

Correct but, if your building it's nice to not have to buy if you have!

>Would the 6121 have any application outside of a DECmate? It's part of
>the wierd console emulation on the DM, isn't it?

It's the IO port device (decode and register control). It's not quite
standard
PDP-8 but it is generally useful.

>> The DMIII it will be the 6120 and maybe a 6121 plus 2882 and the eproms,
>> though I'm less sure as it's been a long time since I've had to open one.
>
>What's the 2882 do?

UART. The DMIII had D7201 {intel 8274} dual USARTs, not common but useful
as it's nearly identical to the Z80 SIO but, intended for
8080/8085/8088/8086
style busses.

Allison
Received on Wed Apr 03 2002 - 08:05:46 BST