Search found 681 matches

by hlide
Sun Jun 05, 2022 4:20 pm
Forum: Hardware
Topic: Help: Sharp MZ 700 short fuse with video connection
Replies: 13
Views: 5544

Re: Help: Sharp MZ 700 short fuse with video connection

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 ...
by hlide
Sun Jun 05, 2022 2:16 pm
Forum: Hardware
Topic: Help: Sharp MZ 700 short fuse with video connection
Replies: 13
Views: 5544

Re: Help: Sharp MZ 700 short fuse with video connection

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? ...
by hlide
Sun Jun 05, 2022 1:36 pm
Forum: Hardware
Topic: Help: Sharp MZ 700 short fuse with video connection
Replies: 13
Views: 5544

Re: Help: Sharp MZ 700 short fuse with video connection

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...
by hlide
Wed Jun 01, 2022 11:37 pm
Forum: Hardware
Topic: MZ80B - BootRom Disc
Replies: 12
Views: 7637

Re: MZ80B - BootRom Disc

This is a GAL, not a CPLD.
by hlide
Mon May 30, 2022 8:09 pm
Forum: Hardware
Topic: MZ-80a US Power Supply
Replies: 4
Views: 2551

Re: MZ-80a US Power Supply

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
by hlide
Wed May 18, 2022 12:55 pm
Forum: Hardware
Topic: Are there factory bodges on MZ-80K PCB?
Replies: 7
Views: 3402

Re: Are there factory bodges on MZ-80K PCB?

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.
by hlide
Wed May 18, 2022 11:42 am
Forum: Hardware
Topic: Are there factory bodges on MZ-80K PCB?
Replies: 7
Views: 3402

Re: Are there factory bodges on MZ-80K PCB?

Ah yes, you probably had a 40/80 column switcher so the clock circuit should have been modified as well.
by hlide
Wed May 18, 2022 11:35 am
Forum: Hardware
Topic: Are there factory bodges on MZ-80K PCB?
Replies: 7
Views: 3402

Re: Are there factory bodges on MZ-80K PCB?

Another set of schematics here at the end of the page: http://www43.tok2.com/home/cmpslv/Mz80k/EnrMzk.htm
by hlide
Wed May 18, 2022 11:11 am
Forum: Hardware
Topic: Are there factory bodges on MZ-80K PCB?
Replies: 7
Views: 3402

Re: Are there factory bodges on MZ-80K PCB?

Try to see if the mod is that one: https://www.sharpmz.no/articles/the-mz- ... m-support/

I believe there are several methods though.
by hlide
Wed May 18, 2022 11:08 am
Forum: Hardware
Topic: Are there factory bodges on MZ-80K PCB?
Replies: 7
Views: 3402

Re: Are there factory bodges on MZ-80K PCB?

That model were heavily modded and had a 4MHz turbo clock which means several cuts on te motherboard to make it happen. Just removing such addition won't restore the original clock circuit.