Well, I thought I had better start taking some pics as I try and resurrect my early teenage years as I alluded to in my registration message.
I'm calling it the Franken //e because some of you may recognise it from the TM listing - missing keys have been replaced with some I had kicking around in an ice cream container.
Who has random spare keyboard keys? Ok, these are not Apple keys, but seem to have a similar mount. They were from a pile of Beehive dumb terminals that I bought about 25 years ago when I thought it would be a good idea to hang something of my PC Com port. Because it was there. $20 at a Turners auction from memory. Sat in the garage doing nothing for years, until I decided that the base and power supply would be good for my watering system. I picked off the keys, and binned the rest. (Yeah, not the smartest move! - Rest assured I still have a working Wyse-60)
So anyway, that's why there are some white keys that sit up proud of the rest.
Next up, an appalling epoxy job that I did in haste after finding a chunk of the case covered in dust and lint under the Motherboard. Pretty sure that spilled epoxy on the PSU (The result of it falling off halfway through curing) will buff right out...
Here's the innards - top right indicate NTSCs International version. Seems to talk to the 30" Black Diamond Ok, and its green monitor will do just fine. Also, the printer card that Marcus very generously sent me. I think it's a Grappler+ clone - looking forward to hearing the whine of an Epson again soon.
Yeah - so the current state of play has moved on a bit. The error that the TM seller mentioned has morphed after socketing the RAM and swapping out the original chips with recycled replacements. Now, instead of random ASCII across the screen, which ended up with characters redefining themselves I get a semi stable display showing POST errors codes. Most typically, RAM ones. Now this would normally point to issues with the RAM IC's, but I have swapped these out a fair bit, and even swapping 1 and 2 around I consistently get errors in the lower nibble range. I'm picking that this is actually symptomatic of the MMU.
Oh, and before anyone says anything, yes, that is a naked torso reflected in the monitor - it's 30° here, and worse in the garage with no wind!
So, I'm currently awaiting the arrival of some replacement 65C02 ICs - the first lot I ordered were vague in description, and I ended up with 5x6502 (recycled - yay e-waste does come back!) via AliExpress. If that doesn't work, I'll be going after what is probably the prime suspect - the MMU. It was under the MMU that I found the chunk of plastic that I epoxied back on - and confirmed that the nice dark brown paint is conductive to enable shielding in the case. I suspect this may have shorted out something on the MMU, and also took out at least one of the D41464 RAM chips.
So - apart from scouring TM for a donor board, any bright ideas on locating an International NTSC MMU?
CPU and MMU numbers
PS - Thanks again to Marcus and Gavin for their offers of assistance in this endeavour!