"New" PDP-8 - test-drb@ccmp.vtda.org

3 Apr 2002

From: Ethan Dicks &lt;erd_6502(a)yahoo.com&gt;

...
 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