ST-506 hard drive emulation

[Dwight K. Elvey]

>From: "Jules Richardson" <julesrichardsonuk at yahoo.co.uk>
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>
>> > The bit I don't know is the nature of the data signal at the interface -
>> > it uses +/- signal lines for both read and write data. I'm not sure if
>> > that's an analogue signal or a digital one.
>> 
>> Digital.
>
>Well that bit's easy then :)
>
>
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Hi
 Digital but self clocked. On the write side it is
a pulse to the write amplifier. On the read, it
is a pulse indication a transition at the head.
The pulse width is not important on the read but does
have a min/max. Write pulses need to be the correct
width to tighter tolerance. Time between pulses is the
most important element.
 But, yes, digital differential signals.
Dwight