Microbee restoration

[aladinsane]

We would be very interested in the all the ROM dumps being a Danish model.  We have the Character ROM dump but nothing else.

Sure thing Should I just post them here or send them directly to someone?

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Okay, so there is some progress. Following a recommendation, I tried removing the T2 and WordBee roms as well as the PIO chip. And now one machine boots to a Basic prompt

The machine still boots to Basic with all roms inserted, but not when the PIO chip is in. Furthermore, I have now been able to validate that both core boards works.
However, the other machine still does not boot - regardless of whether the PIO chip or the extra roms are in or not. On the other hand, it seems that the 74C74 (IC33) does not forward the MREQ signal from the CPU, so I suspect that that chip is dead.

I have tried swapping the two PIO chips, but it makes no difference. Of course, I cannot say whether they are both defective or whether something in the circuit around the PIO is faulty.

The keyboard does not work, but I guess it's due to the missing PIO chip.

The image is not completely stable. It looks fine enough but every now and then there are some purple artifacts that fill the entire background. They come in flashes and furthermore the background is not "pure black" but there is a little "noise" in the black. Maybe a faulty clock divider?