On 5/16/23 16:04, Fred Cisin via cctalk wrote:
> 
> 
> For Jim Brain's Coco disk, my inclination would be to image it on an ISA
> machine using the WD controller.  but, an argument was made that a flux
> transition read might be a way to cut down on the number of reads.

Bear in mind that the datarate of a ST506 MFM hard drive is 5MHz, as
opposed to 500KHz for an 8" MFM floppy, so the sample clock may have to
run quite a bit faster--should not be a problem on any modern MCU.

But also note that the data lines to the drive are *differential* not
single-ended, so you'll also need RS422 receivers as well as proper
termination.

FWIW,
Chuck


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