acorn atom and acorn system series • Re: Combined VGA / Tube interface board for Atom

I am working on adding SID emulation to the pico-vga firmware. Do you know if the pico on the VGA/Tube board can see the SID register addresses starting at #BDC0?

Hi Chris,

That sounds pretty awesome! All 16 address bits are wired through to the Pico, so the Pico should be able to decode any address. I guess you're already aware that the Pico is doing a bit of multiplexing on the address and data bus lines, sequentially reading address low, address high and then data?

I had hoped that I could use the Pico for address decoding the Tube, but Dave was concerned about the amount of time it would take to fully decode the address, so this is being done by a separate GAL:

viewtopic.php?p=380877#p380877

I'm not sure if similar timing limitations will cause issues with the SID emulation?

Also, where can I get a VGA/Tube board?

The project is available here: https://github.com/kgl2001/Atom_VGA_Tube_Combo

I have a couple of fully built up boards available, if that's what you're looking for.

Ken.

Statistics: Posted by KenLowe — Sat Oct 12, 2024 10:48 pm

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