8' drive on PC troubleshooting

[mhscc at canada.com]

-------Original Message:
> Date: Sat, 5 Mar 2005 12:41:50 -0600
> From: "Randy McLaughlin" <cctalk at randy482.com>
> Subject: Re: 8' drive on PC troubleshooting

> From: "Geoff Reed" <geoffr at zipcon.net>
> Sent: Saturday, March 05, 2005 11:55 AM
> > are there any 8" drives out there that don't require 24 volts to
> work? I 
> > have LOTS of powersupplies that supply GND, +5 and +12, but none
> that also 
> > supply +24 :(
> 
> To my knowlegde +5v & +24v are required by all 8" drives, other
> voltages 
> vary from drive to drive.  Before plugging in power connectors
veryify 
> voltages.
> 
> 
> Randy 

If this is on an S-100 System (and if we're talking about 8"
drives, as opposed to the very rare 8' ones :), you can try
connecting the +24V line to the unregulated +18V.

>From the installation instructions for the Quintec Tophat, a
dual 8" (TM848 Tandon) drive assembly that fits across the top of 
a Cromemco Z-2:

...Using a good DC voltmeter be certain that the +18V line is running
at least 18 volts, preferably higher, around 19 volts...

And if anyone really needs a +24V supply, I *might* have one or
two in the basement somewhere (+5, +12, +24). Not light, though,
as I recall...

mike