Cumulus incompability solved, i think.

This is the right place to discuss on how to implement hardware vsync, adding a VIA or AY chipset, puting multiple roms, or how to design a new flash expansion card.
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zaxon
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Cumulus incompability solved, i think.

Post by zaxon » Sun Oct 08, 2017 1:46 pm

Some Oric not working with Cumulus, here is small circut for mod Bus board what can help .

This circut improve O2 signal from CPU to Cumulus.

Desolder U1 pin 11 from bus board. Desoldered pin is connected to 74HCT123 pin 2 (O2IN signal )
From pin 1 74HCT123 connect ( signal O2OUT) to pad where was pin 11 of U1 soldered before.

I hope this help. Also soon i recive fixed PCB for busboards so if somebody need one let me know.
Attachments
fix do cumulusa.jpg

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Dbug
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Re: Cumulus incompability solved, i think.

Post by Dbug » Sun Oct 08, 2017 1:53 pm

Your improved bus board is compatible with the original Cumulus built by Retromaster and Metadata?

zaxon
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Re: Cumulus incompability solved, i think.

Post by zaxon » Sun Oct 08, 2017 2:02 pm

I build some cumulus few months ago too and i build next few soon . Yes, orginal busboard for Cumulus like this, is modded ;)
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fix.jpg

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ibisum
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Re: Cumulus incompability solved, i think.

Post by ibisum » Sun Oct 08, 2017 5:16 pm

Cool! I haven't run into this issue with any of my Atmos's yet, but its good to know you fixed this!

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