Neuer romdump von Radon17: ИМ-01 urversion

Hi hap,
I think there's something wrong with your latest changes in the im01 driver.
The new machine IM-01 behaves quite cracy - the keys Enter/Move/Takeback are repeating immediately if you press them a bit too long, so these keys are almost unusable.
For example: enter d2d4 and press Enter a bit longer, then it returns random results (sometimes g8f6, but sometimes also g1f3 or e2e4 which are white moves of course), or even starts thinking (i.e. it's out of the book), depending on how long you press (or click) Enter.
The same is true for Move or Takeback and it's the same for the IM-01T, too - you get a random behaviour depending on how long the key is pressed.

In your previous driver everything was working fine for the IM-01T, and I guess that your changes in the address map (combining both machines) are the reason for these new problems.

Regards,
Franz

Ok, I think I can fix the problem, give me a few minutes before I upload the source.

Yep, now the keys are working correctly again - you're a genius!

BTW, this older model IM-01 seems to have also different functions - e.g. the Takeback key only displays "0000", but doesn't take back any moves!?
I've not yet found what this key is good for in the IM-01.
But that's not a problem of the MAME emulation, the Russian emulator also shows the same behaviour.

I've this chess computer, and this function does work, but you can only go back one complete move. If you press a third time, "00.00" is displayed.

Best,
Gerardo

Well, not in the emulation! It already shows "00.00" at the first click on the Takeback button and no move is actually taken back.

Yup, it means my fix is not good.

To work around it:
u16 conflict = (offset == 0x1f) ? 0xff : 0;

But I think the real issue is that the CPU is doing a bus error trap. It's not a weird bus conflict after all.

No, that doesn't change anything - I've just tried it.

But also in the Russian emulator this Takeback key doesn't work, so maybe Gerardo has a different ROM version of the IM-01?

Theoretically no. They have the same reference!

This is the correct fix: https://github.com/mamedev/mame/comm...3da44269b50e64

The manual says take-back only works after 3 moves after starting a new game, or after 2 moves from any other position. And like Berger said, you can take back only 1 move.