ST-506 hard drive emulation

[Dwight K. Elvey]

Hi
 I shouldn't be saying this because I'm not sure when
I'll be able to look for it but I'm almost sure I have
the schematics for a 5 Meg Seagate drive someplace in my piles.
It might be a month or so before I come across it.
 I, also, am almost sure I have a ST506 signal specification
booklet from Seagate as well.
 I'll do some digging soon but I'm not where the piles are,
except on weekend ( but not this next weekend ).
Dwight


>From: ard at p850ug1.demon.co.uk
>
>> > Correct. Don't uou have at least one ST506/ST412-interfaced drive 
schematic?
>> 
>> Nope, unfortunately not :-( I've got various manuals for bridge boards,
>> which of course have the connector pin-outs in (and give some of the
>> theory), but nothing for a complete hard drive (I suppose I'mactually
>> surprised such schematics ever escaped the drive manufactuers to be
>> honest, as presumably ST506/412 units were never supposed to be field
>> servicable?)
>
>THe HDAs were not field-repairable, but the PCBs certainly were/are. 
>
>The IBM PC series TechResf contain schematics of some such drives (which 
>ones depends on exactly which version fo the TechRef amd which updates 
>you have). I've traced out a couple more. In general these drives are not 
>particularly complicated, although there may well be ASICs for things 
>like head switching, motor control, etc.
>
>I must get at least one of the latter diagrems to you ay some point.
>
>-tony
>