PC8801 3.5 Floppy

HxC Floppy Emulator on PC88 / PC98 and compatible support
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Akibakun
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Joined: Fri Feb 02, 2018 3:25 pm

PC8801 3.5 Floppy

Post by Akibakun » Fri Feb 02, 2018 3:33 pm

Hello. I am a new member and I just wanted to ask some questions:

I have a PC8801MK2SR and I would like to connect a "3.5 floppy. Is it possible to connect a "3.5 by replacing one of the "5 inch floppy drives? And if possible, how can I do this? Is it possible to take a PC98 "3.5 floppy and put it into the PC88 computer, or is it not compatible?

The question is because although I eventually want to use a HxC floppy drive emulator, I first want to try this solution since I have a big bunch of "3.5 floppies in my house that would be useful.

Anyone with experience of this? Is the procedure the same as with connecting the HxC floppy emulator? Could I just take/make a cable intended for the HxC and then just put a "3.5 floppy drive there instead of the HxC?

Sorry for the noob questions. Thanks in advance.

barbeque
Posts: 3
Joined: Sun Aug 12, 2018 1:38 am
Location: Canada

Re: PC8801 3.5 Floppy

Post by barbeque » Sun Aug 12, 2018 1:42 am

Hi there. I have a non-SR PC8801mkII and have been looking into it myself.

Here is a page that I found on the subject: http://tulip-house.ddo.jp/DIGITAL/FD88/index.html

Here is the pinout that is provided on that page:
Image

The gentleman in the link made a handmade adapter, but I'm not sure if I will do the same thing or just cut up a ribbon cable. I do not know enough about floppy drive connectors yet to tell if there is an easier way - perhaps something off the shelf.

I am not sure if this is the same cable as the one you would use with an HxC/Gotek but I assume so.

Good luck! Please let me know if you are successful, or even if you want to discuss general PC-88 topics/repairs. It's hard to find English-language material on these computers.

barbeque
Posts: 3
Joined: Sun Aug 12, 2018 1:38 am
Location: Canada

Re: PC8801 3.5 Floppy

Post by barbeque » Mon Sep 03, 2018 5:46 pm

I ended up building an adapter board, though the first run has a lot of mistakes that I would like to fix before I give out the kicad files and BOM. Unfortunately I am quite new to electronics.
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I used the HxC firmware on a Gotek. Great stuff! :D

I can confirm that Nishida-san's adapter schematic above works.

Jeff
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Re: PC8801 3.5 Floppy

Post by Jeff » Fri Sep 07, 2018 10:36 am

barbeque wrote:
Sun Aug 12, 2018 1:42 am
Hi there. I have a non-SR PC8801mkII and have been looking into it myself.

Here is a page that I found on the subject: http://tulip-house.ddo.jp/DIGITAL/FD88/index.html

Here is the pinout that is provided on that page:
Image

The gentleman in the link made a handmade adapter, but I'm not sure if I will do the same thing or just cut up a ribbon cable. I do not know enough about floppy drive connectors yet to tell if there is an easier way - perhaps something off the shelf.

I am not sure if this is the same cable as the one you would use with an HxC/Gotek but I assume so.

Good luck! Please let me know if you are successful, or even if you want to discuss general PC-88 topics/repairs. It's hard to find English-language material on these computers.
This adapter is totally useless for the SD HxC & HxC Gotek : You don't need to make such adapter since you can change the interface mode to emulate the shugart floppy bus.

barbeque
Posts: 3
Joined: Sun Aug 12, 2018 1:38 am
Location: Canada

Re: PC8801 3.5 Floppy

Post by barbeque » Fri Sep 14, 2018 7:30 pm

Jeff wrote:
Fri Sep 07, 2018 10:36 am
barbeque wrote:
Sun Aug 12, 2018 1:42 am
Here is a page that I found on the subject: http://tulip-house.ddo.jp/DIGITAL/FD88/index.html

Here is the pinout that is provided on that page:
Image
This adapter is totally useless for the SD HxC & HxC Gotek : You don't need to make such adapter since you can change the interface mode to emulate the shugart floppy bus.
I didn't know that, thanks.

In that case the adapter board I built only really provides an edge connector -> 34 pin IDC adapter, which you should just be able to crimp onto the ribbon cable directly, since the Gotek/HxC can be convinced to use Shugart mode instead.

You should only need that adapter wiring for an IBM PC 3.5" floppy drive, from the sound of it. I haven't tested my board with one yet, only the Gotek.

Good luck!

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