Search found 34 matches

by dat-alex
Thu Sep 30, 2021 7:11 am
Forum: Hardware
Topic: MZ-80b FI/O to HxC Cable
Replies: 64
Views: 32806

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

Thanks for the infos :) I will make some 'homework' and I will return with the results. *UPDATE* Well I've made some tests with the same results . Excepts ONE disk from 38 all the others starts loading with freezing at boot...(!) I suspect 64K ram memory problem. I run this MZ80 emulator and tried t...
by dat-alex
Wed Sep 29, 2021 3:18 pm
Forum: Hardware
Topic: MZ-80b FI/O to HxC Cable
Replies: 64
Views: 32806

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

Well I changed one cap from 3.3n to 15p (I had in box) and now I get a clean 8Mhz clock output osc3.jpg Now it seems that something is going on! I can get IPL loading message but stuck there... at boot osc1.jpg At least I know my WD1773 (and psmart pcb ;) ) is working maybe there is something wrong ...
by dat-alex
Sun Sep 26, 2021 6:31 pm
Forum: Hardware
Topic: MZ-80b FI/O to HxC Cable
Replies: 64
Views: 32806

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: 64
Views: 32806

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: 10
Views: 10909

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: 12
Views: 7496

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: 7050

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: 12
Views: 7496

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: 6632

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: 64
Views: 32806

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...