Restoring a PC Server 500 P/390

Dave Wade dave.g4ugm at
Fri May 18 16:30:31 CDT 2018

I thought I had captioned that picture. It's the original RAID controller
which I am not using. If I plug it in it starts the disks in the RAID array
which takes ages, and steals the hard disk BIOS vector which I need for the
SCSI card that's running the system.

I didn't want to remove it fully as I need to label the cables feeding it.
One feeds the top drive bays, and the other the bottom so if I ever need to
put it back it I need to know which is which. 

If I get some free time I will have a go at starting the disks in it and
repairing the RAID array, and perhaps copy the disks that are installed.





From: Benjamin Huntsman <BHuntsman at> 
Sent: 18 May 2018 21:49
To: Dave Wade <dave.g4ugm at>; General Discussion: On-Topic and
Off-Topic Posts <cctalk at>
Subject: Re: Restoring a PC Server 500 P/390


I gotta ask, what's the deal with the dangling card?  That cracked me up!


Thanks for posting some pics!



From: cctalk <cctalk-bounces at
<mailto:cctalk-bounces at> > on behalf of Dave Wade via cctalk
<cctalk at <mailto:cctalk at> >
Sent: Friday, May 18, 2018 1:46 PM
To: 'Guy Sotomayor Jr'; 'General Discussion: On-Topic and Off-Topic Posts'
Subject: RE: Restoring a PC Server 500 P/390 


> -----Original Message-----
> From: Guy Sotomayor Jr <ggs at <mailto:ggs at> >
> Sent: 15 May 2018 21:39
> To: Dave Wade <dave.g4ugm at <mailto:dave.g4ugm at> >;
General Discussion: On-Topic
> and Off-Topic Posts <cctalk at <mailto:cctalk at>
> Subject: Re: Restoring a PC Server 500 P/390
> > On May 15, 2018, at 1:29 PM, Dave Wade via cctalk <cctalk at
<mailto:cctalk at> >
> wrote:
> >
> >
> > That's, in effect, what I did. Whilst there were Microchannel IDE
> I have never seen one. There are no IDE interfaces on the "Planar" so
> thing must be on the MCA bus.
> > So I bought a BusLogic BT646 SCSI card on E-Bay. I also bought an
> card as a spare.  I think I struck lucky with the BT646. It is a simple
SCSI/2 card,
> no raid but it does have a BIOS with support for two bootable drives and a
> >4GB drive option.
> > OS/2 has drivers for it so it works out of the box. The OS/2 boot disks
> the drive and install the proper drivers.
> > To compensate for the slower "narrow" drives I bought a SCSI2SD card
> puts an SD card on the bus. OS/2 just sees it as a up two four drives
> depending on how I configure it. At present I have two 4gb drives. The
> in it is 32gb so I can add 2 x 12gb drives or 1 x 24gb or some other mix.
The CD
> ROM sites on the same bus. I haven't tried the tape drive yet..
> >

Well I found an XGA2 card in the pile of bits so now I have 1024x768 display
resolution. I have swapped the CDROM for a SCSI DVD drive. 

I managed to boot MTS and there are a few pics here:- 


 <> P390

Explore this photo album by Dave G4UGM on Flickr!

next job is to tidy up and re-assemble the case..


> Some time ago I acquired a PCI P/390 card (along with the various LIC
files).  I
> went down the same path as you to build a P/390 system with OS/2 but I
> kept running into problems with OS/2 versions and supported hardware.
> I finally gave up and acquired a PCI based RS/6000 that I'll install AIX
on and
> have an R/390.  ;-)  I haven't had the time yet to make any progress on
> But it's good to know that you've managed to do this if I decide to go
> and attempt the PC route again.
> TTFN - Guy

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