Blast from the past...

From: Bil Herd (
Date: 2007-03-29 01:55:29

Ok, Jeri Ellsworth got me interested in what the heck y'all are doing
digging up old machines including ones I completely forgot even existed.

After reading backwards through the posts I'd say you guys were right on
the money regarding details and oddities of the software developer
version of the TED.  Maybe it will come to me what case we stuck them
in, someone could beat me to it by comparing it to VIC and C64

The diodes were 1N4148 silicon.  The 8529 came later, probably as a
result of testing with this system as I caught he problem relatively
early, this board pretty much superseded the working silicon as I didn't
see much reason to wirewrap one when I could make PCB's for 20 given
that I was waiting on good silicon.  There was a wirewarap version when
I first got to CBM, it was based on a VIC chip which had nothing to do
with TED, I pretty much unplugged it and set it aside my first day on
the project.  Not that this is a two sided pcb, it was hand taped on
mylar.  The QA is the QA of the PCB fabrication and had nothing to do
with production, it would have been stuffed by the R&D technicians who
also soldered the diodes to TED.

What a blast... I wrote those labels 24 years ago at the age of 24.  I
probably burned the ROMs myself for the run (good way to remove
grumbling when the code changed)

So here is a quiz for all of you retro-junkies.  Look at the picture
that was previously posted by B. Degnan

This is truly vintage Commodore, this is where Westchester/King of
Prussia design met the Japanese re-designers and I learned a cool trick
in the process.  See R10, the 20 Ohm 5W resistor on the left?  The one
that looks really out of place on a computer board.  

The question is: What does this part do? Why does it work?

Let me know you need help getting that software-developer TED working.

Kind regards,

Bil Herd

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