16 Aug
2013
16 Aug
'13
2:09 p.m.
On Aug 16, 2013, at 1:31 PM, ard at p850ug1.demon.co.uk (Tony Duell) wrote:
SMD (and ESDI) drives have the data separator in the drive, so what's presented
on the interface is not the raw data to/from the head amplifiers. Unlike ST506 and
ST412 where the data separator was in the controller.
Having the data separator in the drive makes it a bit easier on the controller since
you get a clock from the drive to clock the data.
TTFN - Guy
The actual
data to/from the drive is almost raw; there's just a
bitstream (at TTL level) from the controller to the drive to write,
and from the drive to the controller to read. So, other than
This sort of interface was quite common on hard disk units at that time.
SMD, for example has high-ish level seek, select, etc lines but raw data
to/from the head amplifiers. So do most DEC drives (RK05, RLs,
RK06/07,etc).