Floppy Disk Interface PCBs

[bartleph]

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.

[vtgearhead]

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.

[bartleph]

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

[bartleph]

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>

[harrywalter99]

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

[BillO]

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.

[bartleph]

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.