• Please review our updated Terms and Rules here

Have a scan of the Percom Electric Crayon EGOS manual and/or EGOS assembly listing?

K

kengr

Member
Joined
Sep 11, 2017
Messages
43
I no longer have my Percom Electric Crayon, but have some software I wrote in the early 1980s that made us of it. (The Electric Crayon attached to the printer port of the TRS-80 Model I, and generated composite color graphics on a separate monitor via EGOS commands.) The manual, as I recall, included programming instructions and an assembly listing of the EGOS firmware embedded in the unit.

I was thinking about building one using modern parts, but would like to look at the EGOS manual and/or EGOS assembly listing (preferably both), to make sure what I put build is 100% compatible with the original.

If you have readable a scan of this material, I'd be very interested. I would even pay for it.
 
I have an Electric Crayon that I've been meaning to do a write-up on with pictures. The only documentation/programming I have for it was from a ?Byte? review.

Mike
 
I have an Electric Crayon that came from the Misosys going out of business sale. Pretty sure I have a manual for it - I'll check and if so scan it. Never have tried to use it.
 
I found a pretty complete (but not 100% complete) technical write-up of the Percom Electric Crayon and the EGOS in the January 1981 issue of 80 Microcomputing, pages 68-86.

Here is a link to the PDF fie of that issue on archive.org: https://archive.org/download/80-microcomputing-magazine-1981-01/80Microcomputing_0181_text.pdf

There is also a less comprehensive write-up in the March 1981 issue of Kilobaud Microcomputing, pages 72-81.

Here is a link to the PDF file of that issue on archive.org: https://archive.org/details/kilobaudmagazine-1981-03

I would still like to get ahold of a copy/PDF of the official Percom manual, though.
 
Last edited:
kengr said:
There is also a less comprehensive write-up in the March 1981 issue of Kilobaud Microcomputing, pages 72-81.

Here is a link to the PDF file of that issue on archive.org: https://archive.org/details/kilobaudmagazine-1981-03
Click to expand...

Thank you for posting the link to that one. I've always wondered what the guts of the Electric Crayon were and suspected it was based on the MC6847 since the 80 Microcomputing article about it used the same "semigraphics mode" lingo that's used in the Color Computer manual, but I don't think the 80 Microcomputing coverage ever actually described what was inside.

Sadly I kind of wonder how trivial it would be to port EGOS to run on the TRS-80 MC-10, it's almost the same machine.
 
You're welcome. I'm not familiar with the MC-10.

I'm still very interested in finding the EGOS manual and/or EGOS assembly listing (preferably both).
 
You must log in or register to reply here.
Back
Top