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Oric-1/Atmos ROM Switch Information

Posted: Thu May 01, 2014 10:35 pm
by StarshipUK
On Wikipedia it reads:

"A short time after the release of the Atmos machine, a modification for the Oric-1 was issued and advertised in magazines and bulletin boards. This modification enabled the Oric-1 user to add a second rom (containing the Oric Atmos system) to a spare rom socket on the Oric-1 circuit board. Then, using a basic DPST (double pole single toggle) switch, the users could then switch between the new Oric Atmos rom and the original Oric-1 rom at their leisure."

Does anyone know where I can find these instructions and also if it is possible to add a Oric-1 ROM to a Oric Atmos (The other way around).

Re: Oric-1/Atmos ROM Switch Information

Posted: Thu May 01, 2014 10:42 pm
by iss

Re: Oric-1/Atmos ROM Switch Information

Posted: Fri May 02, 2014 11:05 pm
by highwayman
it would be better to use a single 27c256 eprom and a pullup resistor (10k)
and a simpler spst switch.