Hi @raritynine, I recently built a new transformer for my CreatiVisions, which was an interesting learning experience (I hate hate hate working with high voltage AC). If you have any questions, ask here and I'll see what I can do to help :-) (I have always told people that the CreatiVision feels lik...

Well, the Xtal for the TMS9929 is totally shot, so I've ordered a replacement for that. (There were char marks on the board from whoever was here before me, the plastic on the package was melted and 2 tracks were lifted.) Phi0 seems to come and go randomly, which is not confidence inspiring. I might...

Awesome work!

When I checked, all address lines seemed to be stuck at high, so presumably FFFF.
This could be the excuse to get a logic analyser I have been looking for

John

OK so I have swapped over the 6502 into my Apple IIe and it boots fine, so it's not the CPU. (I also tried it with the MegaSDCart, with no change) Looking at the schematic, there's a lot of things hanging off that data bus and, of course, none of them are in sockets :-/ What's the startup order for ...

Thanks for that Tom,

PHI0 has a 2MHz clock,
RESET is going HIGH after a short delay. Presumably that's all "sane"...

I guess I'll need to pull the 6502 and look for a spare... I'll check if the one in my Apple is socketed...

John

Trying to repair a 700305H revision motherboard that has been "attacked" by the previous owner. So far I have replaced the track they lifted near the power supply connector, desoldered and resoldered properly the power connector itself and cleaned up a burn mark near the crystal. This I don't know w...

At least you'd be able to reuse the TMS Video chip if you can HALT the Z80 I guess.
One less component.

https://www.jaycar.com.au/smd-diode-sm5 ... 0/p/ZR1021 for the diodes.
https://www.jaycar.com.au/smd-tactile-s ... 0/p/SP0610 for the SMD tactile switches.

Hoefully you'll be able to source something locally. They looked pretty generic.

john

Excellent!
Let me know if you hit any difficulties

John