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Hi, I have some bare Floppy Disk Interface PCBs to sell if anyone is interested. The design is based around the Elektor Junior FDC and is designed for OSI-65D and Shugart 5.25 Floppy Disks. They are also compatible with Gotek's running FlashFloppy and .HFE disk Images. I have managed to have Drive A & B as Goteks, and Drive C as a Teac FD45. In line with OSI's DOS, a PIA (6821,6521) is addressed @ $C000 and an ACIA(6850) is addressed @ $C010.

All address decoding is on-board. Connections to any 6502 board are D7...D0 (Buffered by 74LS245 on board) A15...A0 ( only A0,A1,A4,A5,A8,A9,A10,A11,A12,A13,A14 & A15 are used) PhI2 & R/W. I've attached the cct diagram I used.

Can this interface be used with an OSI 600 Superboard? I'm relatively new to this machine and trying to learn and acquire useful peripherals for it.

Hi vtgearhead,
Yes it can. As long as you can connect A15...A0, D7..D0, R/W and Phi2 It should work fine. Just make sure that your monitor has the Floppy bootstrap included (Start menu has a 'D' option) and you have no other peripheral at $C000-$C011. If you are going to use a Gotek Device I would suggest using one from Simulant (www.simulant.uk) with the latest FlashFloppy firmware (Currently v3.29). They come prewired for you to install a Rotary Encoder and a Speaker for that nostalgic 'tick tick tick' of a floppy drive. I also have a 0.96 128x64 I2C display in mine as it is much easier to see!!

You will also need OSIHFE from http://osi.marks-lab.com/software/tools.html. It will allow you to convert Disk Images in OSI format (.65D) to FlashFloppy images (.HFE) which the Gotek will be able to emulate the respective floppies. I also use Sandisk "Cruzer Fit" 16Gb USB Flash Drives in my Goteks. I can store approx 1000 disk images on a single USB stick.

Hope this info helps...Best wishes Paul

In case anyone is interested:
<a href="https://www.tindie.com/stores/hobbypcb/ ... dium"><img src="https://d2ss6ovg47m0r5.cloudfront.net/b ... ediums.png" alt="I sell on Tindie" width="150" height="78"></a>

Thanks for all of the information you have provided. I followed the link and there was a board available.

Seeing as you are out of cards right now, would you be interested in sharing the full schematic? The one posted does not show many of teh connections.

Hi BillO
I guess your post was bang smack in one of our covid lockdowns, but that doesn't excuse my inability to check for any messages...my bad!!
I have 7 floppy PCBs available now and ship worldwide, so if you are interested in purchasing any, please let me know.