Search found 32 matches

by dat-alex
Sun Sep 26, 2021 6:31 pm
Forum: Hardware
Topic: MZ-80b FI/O to HxC Cable
Replies: 58
Views: 3735

Re: MZ-80b FI/O to HxC Cable

@psmart : Thank you for your infos. .....Check the SFD800 card and the expansion box. Also, the 34pin connector on the SFD800 is in reverse so you have to reverse the cable (ignore the index plastic, force it in), I never understood why this was but duplicated the card as per the original. ... I've ...
by dat-alex
Sat Sep 25, 2021 3:50 pm
Forum: Hardware
Topic: MZ-80b FI/O to HxC Cable
Replies: 58
Views: 3735

Re: MZ-80b FI/O to HxC Cable

I actually ended up cleaning all the contacts on the edge connectors in the I/O bay and the pins on the MB and everything seems to be working now. I also switched over to the Gotek which works fine too. @arnuphis . Hi,myfriend: I have connected Gotek with psmart SFD800 pcb on my 80B but I cannot ma...
by dat-alex
Thu Sep 23, 2021 8:15 am
Forum: Hardware
Topic: Gotek drive emulator
Replies: 9
Views: 3762

Re: Gotek drive emulator

Sharpals wrote: Sat Oct 24, 2020 8:49 am
Gary C wrote: Thu Sep 24, 2020 3:10 pm \....
Then I could load MASTER-BOOT (from https://original.sharpmz.org/) from the cassette and use it to format the Gotek and write WAV files loaded from the cassette onto bootable master disks.
...

Is there MASTER-BOOT utility for 80B ?

Thank you
Alex
by dat-alex
Mon Sep 06, 2021 9:56 am
Forum: Hardware
Topic: MZ80B - BootRom Disc
Replies: 9
Views: 343

Re: MZ80B - BootRom Disc

Thank you Parc for this useful infos (and schematic! :D ) I was looking for these many times with no result. I had also examined IPL listing trying to make a 'raw schematic' from the code but I wanted to make sure of a working one. Well done my friend ( Update: I noticed that extra logic needed for ...
by dat-alex
Mon Sep 06, 2021 9:23 am
Forum: Hardware
Topic: MZ-80K where to start to repair
Replies: 17
Views: 395

Re: MZ-80K where to start to repair

Have you tried sound test:

Type SG (enter) to turn on key sound and test (don;t forget to check the volume in the rear)
if we have sound it is an indication of CPU working ... an maybe the problem is vram :idea:
by dat-alex
Fri Sep 03, 2021 5:13 am
Forum: Hardware
Topic: MZ80B - BootRom Disc
Replies: 9
Views: 343

Re: MZ80B - BootRom Disc

Hi Parc. I want to make a project on 80b interfacing a boot rom + serial interface + esp8266 wifi for connecting to on-line text-base bbs.
Gathering infos on this . Where can I find infos on 80B boot rom schematic. Thank you.

Alex
(sorry for the off-topic)
by dat-alex
Sun Aug 29, 2021 8:54 am
Forum: Hardware
Topic: replacement parts for MZ-80K help needed
Replies: 16
Views: 274

Re: replacement parts for MZ-80K help needed

Hi!

I would suggest first replacing the corrosive ic sockets and then try to clean the pins of the IC.

I suspect your problems maybe solved with these two problems in mind.

Carefully desolder IC socket and replace with new ones. aAlso ,could you provide us of a photo of the corrosive chips(s)? ;)
by dat-alex
Tue Jun 22, 2021 4:26 pm
Forum: Hardware
Topic: MZ-80b FI/O to HxC Cable
Replies: 58
Views: 3735

Re: MZ-80b FI/O to HxC Cable

Hi dat-alex, If i get to developing the 1773 before you will pass it on. Currently writing VHDL/C for an OSD on my emulator (similar to MiSTer but embedded), most of the emulator core is now functional on the Cyclone IV so once all this is done will turn to the much needed floppy controller. Good l...
by dat-alex
Tue Jun 22, 2021 11:35 am
Forum: Hardware
Topic: MZ-80b FI/O to HxC Cable
Replies: 58
Views: 3735

Re: MZ-80b FI/O to HxC Cable

@dat-alex - looking good, what package are you using, Quartus II schematic capture? I havent studied the differences between the 1772/1773 but I should image it wont take much effort to update the 1772 design. I will take a look soon as Im currently porting my Sharp MZ Series emulator to a Cyclone ...
by dat-alex
Wed Jun 02, 2021 6:42 am
Forum: Hardware
Topic: MZ-80b FI/O to HxC Cable
Replies: 58
Views: 3735

Re: MZ-80b FI/O to HxC Cable

This is just a test of the GAL (to replace the PAL) in the original board. The new boards are almost the same (different routing and copper fills) so I dont expect any gotcha's, made several tests to verify the hand drawn schematic against the physical card. Just waiting for the parts to arrive, ho...