Hi guys, I've just bought myself another Big, Heavy Hard Drive... This time, it's a CDC/Magnetic Peripherals 94205-51, 42MB MFM, 5.25in Half Height, (though it looks a lot bigger than 5.25in), with an ST412 style interface. I also snagged a Western Digital WD1003-WA2 MFM controller, and a full set of cables. Whether I'll be able to fit the WD1003 into the 386 PC remains to be seen: if it will fit, it'll be a tight squeeze. As for condition, there are few bad tracks marked on the drive label, but it spins, appears to pass the seek test, and unlocks the actuator successfully (there's a loud CLACK just before the seek test starts). Question: Does anyone have an OEM Manual or similar for this drive? There's a manual for the Wren II ESDI on Bitsavers, but apparently not for this drive. I can work from the ST506 spec if need be, but the original manual would be nice to have. For the pathologically curious: I'm building an ST412 adapter for the DiscFerret (details will, of course, be published "when it's done"). It turns out I've over-engineered the DiscFerret's PSU quite significantly: even with the 20W load the Wren places on the power rails, the PSU doesn't even break a sweat... I'll probably end up adding a 4-way DIP switch to set the "drive select" value, and run it off of the Ferret's DS0. That leaves me with DS1 to use for head-switching, along with a few other I/Os which are on the Shugart floppy interface but not the ST506 Control connector. MFM RDAT/WDAT will be fed to the High Speed I/O connector for obvious reasons :) I'm planning on replacing the "recommended" 75157/75158 "dual differential driver/receiver" pair with a 26LS31/26LS32 quad diff RX/TX pair on the grounds that: * The 26LS parts are cheaper by about a factor of 3 * the 26LS parts seem to be easier to find (higher stock levels at Farnell and Digikey when I last checked). Anyone reckon I'm likely to have any problems with this substitution? Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/