Hi everyone, I have this floppy disk drive card witha a shugart port.
I can't find any information about the manufacturer.
Does anyone know of any documents with information about this board?
what are jumpers switch for?
Anonymous
User login
Please support the defense of Ukraine.
Direct or via Unclutter App
Active forum topics
Recent content
Navigation
No Ads.
No Trackers.
No Social Media.
All Content Locally Hosted.
Built on Free Software.
We have complied with zero government requests for information.
There is a picture of a board like yours on the Apple Documentation Project site:
Link here
but no further information. I suppose the port on the side is for a SASI hard disk?
Just a DISK II controller with a PC floppy interface, some call it Shugart, or SA400. When controlling a PC floppy drives it cannot step half and qurter tracks. Otherwise is compatible with DISK II drive and can go to 40 tracks or so. There were many controllers like this one, all having similar circuit design.
You're right retro_devices, I should have known just by counting the pins. 34 pins = floppy interface.
However, there were some differences between the Shugart SA400 and later IBM PC floppy connector, in terms of the disk change, TG43, drive select, etc.
I'm quit sure this is an EHRING FDC4 (or clone). Dependend on the switch settings it can handle two standard APPLE drives, or two shugart drives. But not at the same time. A diskette with patch software (PATCH 165 or 167) is needed to enable access to the double-sided drives with up to 160 tracks under DOS,UCSD or CP/M.
https://www.applefritter.com/appleii-box/H085_AppleIIFDC4.htm
Regards GdG