> On Oct 23, 2025, at 5:01 PM, Doc Shipley via cctalk <[email protected]>
> wrote:
>
> On 10/22/25 18:04, Mike Katz via cctalk wrote:
>> I just purchased an old Gimix computer (now if only I can get it from
>> Orlando to Chicago before my friend goes down there for Christmas).
>> It has an OMTI 20C-1 MFM hard disk controller with a IMI 5018 19MB hard disk
>> drive in it.
>> I am thinking of trying to upgrade the hard drive. The Gimix System that I
>> worked on had a half high 20MB drive and a Syquest removable 5MB drive.
>> Does anyone have an old MFM drive laying around (half high or full height
>> but larger than 18MB) and/or an MFM removable cartridge drive with
>> cartridges?
>
> Pretty sure Mr Gesswein is on this list but I don't see him post often.
> Anyway, he designed a very handy MFM drive emulator:
>
> https://www.pdp8online.com/mfm/mfm.shtml
I thought I sent Dave my results for the Pro. I've used it to read RD51 and
RD52 (the one from Quantum). I've emulated those and RD50 and I think also
RD53. Don't remember if I tried emulating any of the other drive models the
Pro supports, such as the other two RD52 flavors. It isn't hard to do that so
long as you know the geometry. BTW, on the Pro all drives have 16 sector
tracks, even if they can and do have more sectors using other controllers.
paul
