Sharp MZ

tingo wrote: ↑Sun Apr 03, 2022 5:07 pm they are supposed to blow before the equipment gets damaged or catches fire.

Ahem, fuses are for that. Those old caps due to their "paper" conception ALWAYS blow and catch fire after a decade, not because they are used as fuses.

MZ-700 is only using 5V from the PSU and it seems you checked it. RF-box is only powered with 5V as far as I know. So the issue is about the current intensity (well that's the function of a fuse). I would say if you have a multimeter, put it in intensity mode with the highest max value and check wha...

For my experimental MZ-700 I used an Amiga SCART cable. Dupont wires to connect the inner RGB connector to DB23 (yes I know we should add resistors to decrease the TTL voltages). Color are too vivid but at last you can test as well.

Here is what I got on a MZ-800 in monochrome monitor video output:

https://www.sharpmz.no/articles/the-mz-series/mz-700/mz-700-connecting-a-monitor-or-a-tv-to-the-mz-700/ It seems you plug the right connector so far. I guess your cinch cable it is an RCA cable (yellow one, I already used them to connect a TV). If you have an oscilloscope, you should probably check ...

Did you invert the connection? I mean connector A was on MZ-700, B on screen. What would happen if B on MZ-700, A on screen? I'm not asking to do so but if you happened to check that also. As a matter, for some reason, using that cable provokes a surge. Did you check the voltage of you cinch cable? ...

Which country? 110V? 220V? Western or Japanese MZ-700? And so on. First, does it happen only when connected to a screen? Does it run without cinch cable? Does it run with cinch cable connected? Because you may have a short-circuit when connecting a cinch cable to MZ-700. Please open the case of MZ-7...

This is a GAL, not a CPLD.

Better, one being able to accept 100-240V to deliver 5V/4A

This one is around 5A:

https://asset.conrad.com/media10/add/16 ... -5-vdc.pdf

My assumption is the clock of LS165 was modified to output at 40 or 80 columns so there was probably a more complex circuit due to addition of VRAM from 1KB to 2KB. I don't know the mod though.