Hardware guru needed!

[Pete Turnbull]

On Mar 5, 12:59, Stacy Minkin wrote:

> Currently I've started KDF11 and it seems to be ok.
> Problems are: It has lots of switches (the same for MSV-11 boards and
> RQDX3 and all of that)

You probably don't need to change anyhing on the RQDX3 -- they're usually set
up correctly (because they'e not often changed :-)

> Same story with RQDX3 - currently I have no RDx disks so I thought
> that boot my system from RX50 is not a bad idea... I've plugged
> standard 5 inch floppy to RQDX3 sig. dist. connector labeled "RX50"
> and fired up the machine. Got nothing.

During init, the RQDX3 probes the disk(s) to see what's there.  For a floppy,
it checks for an RX50 by selecting the drive, finding track zero, and then
switching the side select.  On a real RX50, which actually behaves as two
separate single-sided drives, this turns off the track zero signal; but not on
any normal drive.  There's a way to fool it, but you need to modify the drive
or add a little circuitry.  However, if you can find an RX33-compatible drive,
that would be more useful anyway.


-- 

Pete						Peter Turnbull
						Dept. of Computer Science
						University of York

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