The Sinclair QL Forum

Here's the ROM image.

I copied the crystal circuit from the PCB traces. The capacitor values were not specified on the documentation I had and the cap on the crystal circuit was small and ceramic in the pictures of the board. Anyway, a crystal oscillator is far better, as per my hack. IMG_3505.jpeg The design philosophy ...

Just for the record, here is my Mk.I disk interface board as a KiCAD project. Note that the pins on the connector to the ROMpack are the wrong way around so the right-angled socket has to go on the "solder side" of the board. Also, the clock circuit doesn't work so instead of a capacitor a...

Thanks Dilwyn,

I've been using the transfer program on my QL with limited results. I'll look at the other tools.

The OPD is a strange beast.

The biggest problem is not so much getting the programs as making Microdrive carts which can be read by the OPD.

The issue with BASIC is that it doesn't fit in the 32K ROM slot size. The Telestore hacked things and fitted it in two 32K ROM slots. RAM expansions have to pretend to be ROMs in the ROMpack and then have code which hacks the OS into ignoring the "BAD ROMs" and telling where the extra RAM ...

The interface maps the floppies to the left and right Microdrives. As far as the system and applications are concerned it still has only the two Microdrives and nothing else.

I've no idea how to access it from BASIC at the moment as I don't have a fully working version of BASIC as that comes on Microdrive and isn't built in. As for the design being published. I'll work on a Mk.II which will fix a few things such as the connector having to be on the "wrong" side...

David Warne and Rich Mellor got the Computer One floppy interface ROM image to me today...

Wrote it to EEPROM, set things up, switched on and...


The interface only goes and works first time!

Mine only has three MOSFETs.