Need SA400 help

From: Glen Goodwin <acme_ent_at_bellsouth.net>
Date: Sat Oct 26 14:13:00 2002

> From: Don Maslin <donm_at_cts.com>

> 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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Received on Sat Oct 26 2002 - 14:13:00 BST