MZ-80B project (Floppy Disk I/O Card cloning!)

Pyewacket
Posts: 1
Joined: Sat Jul 20, 2019 1:01 pm

Re: MZ-80B project (Floppy Disk I/O Card cloning!)

Post by Pyewacket »

Any news regarding this?
User avatar
dat-alex
Posts: 20
Joined: Tue Dec 04, 2018 7:18 am

Re: MZ-80B project (Floppy Disk I/O Card cloning!)

Post by dat-alex »

Hi my friend...

Still searching for a good candidate schematic to 'emulate' via fpga design.
Ia m thinking of implementig K & P FDC800 card

https://original.sharpmz.org/usedskdrives.htm

According to datasheet controller chip has the same mapping with original mz80b chip FDD controller
So why not?
member of www.retroclub.info & retroclub.gr
S_U_C
Posts: 38
Joined: Sun Feb 17, 2019 6:41 pm

Re: MZ-80B project (Floppy Disk I/O Card cloning!)

Post by S_U_C »

Hi I found a large A3 scan of the MZ-80A floppy disk card, this will work in the B if you dissable the CS/CE to the EPROM IC 3 PIN 8 to IC 5 PIN 1. add pull-up resister to IC 5 PIN 1
Attachments
img007.jpg
img009.jpg
User avatar
dat-alex
Posts: 20
Joined: Tue Dec 04, 2018 7:18 am

Re: MZ-80B project (Floppy Disk I/O Card cloning!)

Post by dat-alex »

Thank you for A3 scan S_U_C, Have a nice evening
member of www.retroclub.info & retroclub.gr
User avatar
dat-alex
Posts: 20
Joined: Tue Dec 04, 2018 7:18 am

Re: MZ-80B project (Floppy Disk I/O Card cloning!)

Post by dat-alex »

Well after alot of searching around with no result I decided to give a try to the following (in progress) project:

I took the schematic (thanks to Martin8bity)
FDC800_origin.jpg
and re-designed it using XC9536 for digital part and original WD1773 FDD chip
FDC800_CPLD.jpg
my 1773 chip just arrived yesterday after a lot of wait. So I can give my project a try!

I will let you know with the results
member of www.retroclub.info & retroclub.gr
User avatar
tingo
Posts: 37
Joined: Wed Oct 31, 2018 9:10 pm

Re: MZ-80B project (Floppy Disk I/O Card cloning!)

Post by tingo »

That looks interesting. Keep us updated.
--
Torfinn
Gortho
Posts: 29
Joined: Thu Mar 22, 2018 3:53 pm
Location: Poland

Re: MZ-80B project (Floppy Disk I/O Card cloning!)

Post by Gortho »

I agree, looks interesting.
Question. Do you have any relaible source of XC95xx parts? They are obsoleted for a while now, and ebay is a bit hit or miss as a chip source :)
User avatar
dat-alex
Posts: 20
Joined: Tue Dec 04, 2018 7:18 am

Re: MZ-80B project (Floppy Disk I/O Card cloning!)

Post by dat-alex »

Yes I have 2 xc9536 5V from a reliable source already tested. The difficult thing is to property program these guys due a programming bug on the first chip batches.

For the moment (and due to Covid lock down) I designing a development pcb so I can verify the schematic design in real circuit.
member of www.retroclub.info & retroclub.gr
arnuphis
Posts: 25
Joined: Fri Jul 31, 2020 4:18 pm

Re: MZ-80B project (Floppy Disk I/O Card cloning!)

Post by arnuphis »

This is probably the most exciting news for any 80b owner. I am dying to add a Gotek drive.
User avatar
tingo
Posts: 37
Joined: Wed Oct 31, 2018 9:10 pm

Re: MZ-80B project (Floppy Disk I/O Card cloning!)

Post by tingo »

Hmm, I wonder if the original chips are available?
And also, does anyone have the physical measuremnts and layout of the card?
--
Torfinn
Post Reply