14 Mar
2014
14 Mar
'14
12:52 p.m.
Date: Wed, 12 Mar 2014 13:09:30 -0400
From: allison <ajp166 at verizon.net>
To: cctech at classiccmp.org
Subject: Re: PDP-8a Restoration/RL01 issues
Message-ID: <532094CA.2020704 at verizon.net>
Content-Type: text/plain; charset=ISO-8859-1
On 03/12/2014 12:22 PM, Ethan Dicks wrote:v
I bought this one on ebay (I'm still waiting for it to arrive):
http://www.ebay.com/itm/250975975234
Datasheet:
http://pdf1.alldatasheet.com/datasheet-pdf/view/161645/EPSONTOYOCOM/TCO-711…
I'm not very good at Japanese(?), but it seams like it is a 5V
component with TTL compatible outputs. I have drawn a small adapter
PCB that I will try to make this weekend. I'll post pictures of it if
anybody is interested.
/Anders
On Tue, Mar 11, 2014 at 7:03 AM, <anders at
abc80.net> wrote:
Most of the SMD parts are 3.3v..
There are though hole out there, likely you will need a programable part
to get 8.2mhz. Check Silicon Labs for parts, digikey and mouser.
Allison
I have traced the problem back to the RL8A. The
8,2MHz oscillator is not
working... unfortunately I was not
able to find a though hole mounted one, just a SMD part...
I did a quick search
and didn't see an obvious source of through-hole
oscillators at the right frequency (and it is a bit unusual), even
from US vendors.
One solution could be to mount an SMD oscillator in a 14-pin DIP
machined-pin socket frame (with 10 pins removed) either on a small PCB
or with flying leads and a spot of glue.
-ethan