Using GBS-8200 with Oric - things to look out for?

If you want to ask questions about how the machine works, peculiar details, the differences between models, here it is !
How to program the oric hardware (VIA, FDC, ...) is also welcome.
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tingo
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Using GBS-8200 with Oric - things to look out for?

Post by tingo » Fri Jan 11, 2019 5:41 pm

Hello,
I'm thinking of using a GBS-8200 (you know, like these https://github.com/ramapcsx2/gbs-contro ... 0-Variants ) with my Oric-1.
Are there things I need to think of before connecting it to my Oric-1?

On some machines you need to use resistors on the video / sync signals to reduce the level to acceptable for the GBS-8200, but I'm not sure about the Oric.
Torfinn

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iss
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Re: Using GBS-8200 with Oric - things to look out for?

Post by iss » Fri Jan 11, 2019 6:14 pm

Do you have more info (best schematics) about the RGBS input levels in GBS-8200?

From what I read here and here: it's safe and it should work fine with direct connection (just wires) to Oric's RGB output.
Maybe for best colors you need to play with the 3 potentiometers and/or solder 100 Ohm resistors.

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tingo
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Re: Using GBS-8200 with Oric - things to look out for?

Post by tingo » Fri Jan 11, 2019 10:00 pm

No schematics, sorry. However, this thread has links to a Google drive with data sheets for the chips on the board. The TVIA 5725 chip runs of 3.3V and if you run input signal above "right" levels you wiil at least confuse it, or reduce conversion quality. But it is apparently also possible to fry the chip.
Torfinn

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