New subject: Need SA400 help -- Apple ][ ROM -- etc

26 Oct 2002

...
  From: Don Maslin &lt;donm(a)cts.com&gt; 
...
  Drive select - a choice of 1/2/3 - is determined by
the programmable
 shunt at location 1F.  Installing a DIP switch is a much handier means
 of selection.  Configured for multiple drive installation, MX should be
 open, HS shorted, and only the desired DSx shorted. 
Okay, that's clear.
...
  Termination is by a 150Ohm resistor DIP. 
Thanks.  There's an empty 14-pin DIP socket adjacent to the above-mentioned
shunt, so I'd guess this is drive is missing the terminator.
...
  The power connector is the same as used on more modern
5.25" floppy
 drives with pin-1 at 12VDC, pin-2 12V return, pin-3 5V return, and pin-4
 5VDC.  Pin one is identified on the component side of the PCB. 
Thanks again, this drive does not have a "standard" power connector such as
is found on late-model 5.25" drives -- it only has a four-pin header.  Not
being familiar with the SA400, I wasn't sure if this header was normal for
this drive, or if it was some user's modification.
Fred Cisin wrote:
...
  Termination is required on the last drive on the
cable.  Lack of proper
 termination can make for flaky operation, but will not generally
 prevent it from working. 
Sure, but I didn't know the details of the terminator since it's missing on
this drive.
...
  I've never seen a factory switch on the front of
one.   Are you sure that
 that wasn't a user added switch, such as one to override the write-protect
...
  for flippies? 
Not sure at all, but it certainly is professional-looking.  Due to my
inexperience, I've never seen an SA400 before and I thought there might
have been variations.
Thanks to both of you for the information.
Glen
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