INTRO. This page has some of the hardware projects
that I wrote for Rhetoric.
I'm also adding some of the hardware information I have acquired over
... I will not accept any responsibility
for any damage resulting from the information on these pages, or for
any mistakes that may result in harm to you or your Oric. I have
checked as best I can but use of any of this information is at your own
recently discoverd that one of the Cumana disk interface sheets I have
actually an Oric disk interface circuit diagram. The reason I didn't
is it is almost identical.
(Previous entry) I've
found another sheet of info showing the other side of the Microdisc
board. I've not been able to find out which version of the Microdisc
this is from but I'm told there are different ones.
diagram. I've rescanned this so hopefully it is a little
STUFF ALREADY HERE:-
translation of the Service Manual Romu has done a great
job of translating the Service Manual into French for the Oric
community and the CEO have added some extra information, including a
better scan of the circuit diagram. To help download this I've split
the file into these two parts.
Manuel Technique is the manual and Complément
is the additional supplement.
Many thanks to Romuald Line and the CEO for their efforts !
Circuit diagram and component details ***UPDATED***.
I get asked from time to time if I have any details about what the
Microdisc interface is like. Here is the info I have. The images are
monochrome .GIF files which is supposed to be better but if you want
.JPG versions email me.
Right click this link and Save Target As... for Oric Microdisc Manual
Manual for the Oric-1 and Atmos Computers.
Probably the rarest Oric book. I've only ever seen
one which I bought from www.instruction-manuals.co.uk and scanned as I know how useful this can be. I'm
very concerned about people using this information. It tells you how to
repair your Oric - but how good are you at repairing double sided PCBs
? Please get a competent electronic engineer to make modifications for
you. Don't kill your Oric !
There is some stuff here that you may find interesting even if you
aren't trying to fix a broken Oric. The book seems to be a draught
version. For instance, it contains a sentence that isn't finished and
there is not information filled in on page 2. I don't know who the
author was or if there are any other versions in existance. As I said
this is the only one I've ever seen or heard about. that must make it a
fairly important find - but the real worth is the information contained
in the document. Use it well !
diagram images. You'll need these for several projects and
certainly for repair work. If you need a hard copy I still have several
available, otherwise print a copy from the link provided.
Circuit diagram. Sorry this is a bit of a poor image ! For
those that wanted to connect a modem, for instance, this could be
useful. My modem came with a RS232 attached.
document. A Rhetoric article now missing it's pictures. I
hope to retrieve these or redo them at some point. you should manage
from the description.
Twin ROM &
Audio Project. Somehow this didn't get printed in the
last Rhetoric as intended. It details how to add a second ROM so that
your Atmos can be an Oric-1 too. Also how to add a headphone or
extension speaker socket with a handy volume control and switch to turn
off external sound, (leaving sound to the headphones).
FILES. There are several different formats used here If you
have any problems, send me an email and I'll try a different format .
New Oric disk interface circuit diagram Part
New Oric disk interface circuit diagram Part 2
Oric Microdisc circuit details pdf file
CUMANA circuit diagram Part 1
CUMANA circuit diagram Part 2 (105
The Oric Microdisc and OricDOS manual pdf file
Oric Service Manual pdf
Manuel Technique (Service
Manual in French) pdf file
Complément (Service Manual supplement in
French) pdf file
Oric-1 and Atmos circuit diagram.Part 1 and make sure you have Part 2
Serial Port diagram. jpeg image
PSU Repair MSWord document or pdf file with pictures
Twin ROM project Project part 1 Sound project Project part 2