ard at p850ug1.demon.co.uk
Thu Aug 2 13:58:28 CDT 2007
> Hi Tony,
> I did try some other drives, namely some MFM drives
> I had to hand from a PDP 11. These were ST-412
Now wait a second... The PERQ needs uses DS0 and DS1 (Or DS1/DS2 if
the drive numbers them 1-4) for the first and second drive. Now my PDP11s
don;t have modern things like 5.25" wincheseters, but I was under the
impression that on the normal PDP11 Qbus controller you set the drie to
the hgighest drive select (DS3 or DS4 depeding on how they're numbered).
You do want to check this.
> I simply connected the existing PERQ controller to the
> new drive, hoping the hard disk would show ready, but
> no joy.
> The drive didnt even show a flicker on the LED.
That really does sound like an drive select problem
> The drives were all known working, and boot fine on a
> 11/23. I didnt change any jumpers as the drives were
> the only drive in the PDP 11's.
> Could this mean a fault EIO card?
It could. It might also be a fault in the DIB, incorrect drives select
links, etc, etc, etc. I'd not suspect the EIO board _yet_
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