ST-506 hard drive emulation
pete at dunnington.u-net.com
Tue Jul 26 13:15:26 CDT 2005
On Jul 26 2005, 14:42, Jules Richardson wrote:
> I'm not sure how complex such a box would be. I *think* an ST506-
> interface drive looks pretty much like a big floppy, just with more
> heads. Far as I know, it doesn't do anything intelligent on the drive
> itself, just responds to head select / step commands from the
> and reads or writes data.
Yes, except normally the step pulses are buffered, so you can send them
fast and the drive will handle them at the correct rate. At least, all
but the oldest drives do that. That's the main difference between
ST506 (not buffered) and ST412 interfaces.
> The bit I don't know is the nature of the data signal at the
> it uses +/- signal lines for both read and write data. I'm not sure
> that's an analogue signal or a digital one.
> I don't think there's a need to handle anything complex in the
> drive. I believe an ST506 drive's purely a data store/replay device
> it knows nothing of the actual data stored on it - most of the
> on board is presumably just motor control and head amplifiers /
Pete Peter Turnbull
University of York
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