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The diagnostic cartidge can detect something wrong when reading the internal architecture by the expansion bus...but the rvb output is not reachable by the tool, this is the only failure undetectable.

The memory chips are using 64k bits x 4 bits each. maybe you can fill the screen with the "50Hz value" ? If the memory chip is failed, you can exchange them, the "60Hz value" on the screen will disappear. Did you tried the RF antenna mode?

The audio cable can do a shortcut, try the Oric computer with the audio cable disconnected from the DIN socket. The LM386 amplifier is connected directly to the DIN socket, an electrostatic shock done when removing the audio cable can destroy this chip.

When loading, with the monitor of the emulator you can modify the first data of the mc code of the game with a RTS, (POKE#600,#60) return to the loading process, return to the monitor, restore the value, come back to the BASIC page, enter the BASIC line.

The voltage of 4.75v is critical for logic circuits and it is not normal. You must try to connect a big resistor at the output of the regulator (two 3.3ohm 5w resistors in serial mode) and disconnect everything else. We would have proof that the power supply is correct.

Welcome!

virtvic wrote: ↑Tue Apr 26, 2022 7:42 pm ...I fitted a new 7809 voltage reg and am still only getting +4.7v..

7905 Only.
Maybe your 9v psu is no more strong enough?

Nice game !

This one is interesting but you must cut the central pin.
https://fr.rs-online.com/web/p/connecteurs-din/8782680

The pins location

https://docs.rs-online.com/4d08/0900766b8141ad85.pdf

Sorry Maybe this one? https://m.fr.aliexpress.com/item/4001075926519.html?spm=a2g0n.detail.1000014.5.2e81d80f3FqrgB&gps-id=platformRecommendH5&scm=1007.18499.280016.0&scm_id=1007.18499.280016.0&scm-url=1007.18499.280016.0&pvid=fc7e93be-37bf-43a7-aaa8-d3239c108018&_t=gps-id:pl...

Dbug wrote: ↑Fri Apr 22, 2022 1:46 pmI guess that means that one should be fully compatible with the Microdisc?

On the schematic of the Microdisc device, there is a 74LS09 with open collector output for the I/OCtrl signal, that means it is compatible.

There is a device made by Fred72 about a voice synthesizer. https://forum.system-cfg.com/download/file.php?id=22119 Erebus is not compatible to share the Page3 memory with a n other interface because a diode is missing in the Erebus diagram, it is used to make a simple "OR module" wiring. ...

It monopolizes the Page3 from #380 to #3FF for only...4 I/O registers

jbperin wrote: ↑Sun Apr 10, 2022 9:34 am WhichGameIsIt.gif

TheBestGraphicDesigner.gift

the first block erase the zero-page.