sdsnatcher

It's not the RAM that goes on subslot 3-1, but the subROM+optROM. :) The default MSX2+ slot mapping goes like this: - mainROM: slot 0-0 - mainRAM: slot 3-0 -...

Suggestion: If you replace U27 with a 74HCT573, the bit D6 can be used to implement the MSX2+ I/O port F4h without the issue of conflicting with the parallel port,...

> Do we still have this issue? As far as I know Omega boots nicely with MSX2+ BIOS. Humm. I wasn't aware of that. I was fooled by the fact...

There are a lot of free inverters on the current Omega schematic, and any of them could also be used to implement the Ys signal too:

> frankly, the benefit won't be that great. I beg to disagree. Once you have used a turbo MSX machine, you won’t want to go back and will start wondering...

> As far as circuit protection and turbo goes, I simply don't have the real estate on the board to implement these. Turbo is on my wish list for a...

The Panasonic MSX2/2+/TR machines have STOP keys at a normal size, at the top center of the keyboard. Sanyo machines have STOP keys with the same size as the other...

- VDP pin21: The V99x8 is very susceptible to noise. Yamaha provided a separate supply for the V9958 DAC as they learned their lessons on the V9938. If you google...

Note: please keep in mind that anything I state here will be just suggestions/brainstorming, like a friendly chat in a bar or retro meeting. By no means I want to...

- Maybe it's better to use +12V/-12V to supply the opamps, like the majority of MSX models do. This way you won't have to worry about switching noise, biases, and...