15 Jan
2011
15 Jan
'11
1:45 p.m.
On 15 Jan 2011 at 11:10, Pete Turnbull wrote:
Absolutely. The point is that different manufacturers did things in
different ways (in this case a drive not being 'ready' could bne
indicated by inhibiting the index signal).
The TEAC data sheets used to be on TEAC's
Data Storage Products
Division web pages and available from their fax-back service. Trying
to find the index page might be interesting, but AFAICS the docs are
still there. They're also on www.devicemanuals.com.
Fine, but what does this have to do with the operation of the 3.0"
drives that Philip was asking about? AFAIK, the custom ICs used on
Teac drives are sui generis and not shared with other manufacturers. It'd be a little difficult to generalize universal
operation from
Teac specs, I'd think.
True. The problem seems to be (and it's come out in this thread) that
different manufactuers did their own thing. There is nu universal
specification. TYhe best you can do is read as many of the disk drive
manuals and specs as you can and work out how to be compatible with all
of them.
At any rate, on many Teac 3.5" drives, there are many undocumented
jumpers (look for the pads marked "Sx"), so behavior is a lot more
flexible than the OEM documentation would imply for that model.
Annoyling the jumpers -- even the standard ones -- are not documented in
the service manuals at all. They're shown on the schemaitcs, but they
just connect to pins on the ASIC.
-tony