Ok. Thanks for verifying that info, I will try changing the BIOS setting. I do need to
replace the
Dallas RTC as well.
On 3/16/21 12:57 PM, Jonathan Haddox via cctalk wrote:
   I've got a Diversified Tech 286 SBC as well and
was able to switch to 3.5 floppies by modifying the BIOS settings. Mine has the Dallas
Real Time Clock chip and the battery was dead so the BIOS settings weren't preserved
after a reboot. Fortunately I obtained a replacement chip available on ebay to fix that
issue. I haven't got a manual to share, but it's a neat little board.
 Jonathan
      On Tuesday, March 16, 2021, 12:00:02 PM CDT, <cctalk-request at
classiccmp.org> wrote:
  Send cctalk mailing list submissions to
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classiccmp.org
 To subscribe or unsubscribe via the World Wide Web, visit
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 or, via email, send a message with subject or body 'help' to
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 When replying, please edit your Subject line so it is more specific
 than "Re: Contents of cctalk digest..."
 Today's Topics:
 ? 1. VAX rom patches - VAXstation 2000 SCSI boot, KA420 > 1GB boot
 ? ? ? (David Brownlee)
 ? 2. Re: Diversified Technology CAT904 80286 single board PC
 ? ? ? (david raingeard)
 ? 3. Re: PDP-10 I/O notes (Lars Brinkhoff)
 ? 4. who collects modems? (Tom Uban)
 ? 5. Re: Any info on a Western Peripherals DC-230 disk controller?
 ? ? ? (Jay Jaeger)
 ----------------------------------------------------------------------
 Message: 1
 Date: Mon, 15 Mar 2021 18:36:23 +0000
 From: David Brownlee <abs at absd.org>
 To: rob at jarratt.me.uk,? "General Discussion: On-Topic and Off-Topic
 ??? Posts" <cctalk at classiccmp.org>, port-vax List <port-vax at
netbsd.org>
 Cc: Malte Dehling <mdehling at gmail.com>
 Subject: VAX rom patches - VAXstation 2000 SCSI boot, KA420 > 1GB boot
 Message-ID:
 ??? <CAGN_6pbBzUQDJP-YiCQRZsaNOsGye1oWQ_ULyvavEd52ZrYp2Q at mail.gmail.com>
 Content-Type: text/plain; charset="UTF-8"
 I had some extra A4 pages with a VAXstation 2000 manual which covered
 a preview PK2K kit for VMS, bootloader and ROM to allow use of the
 VAXstation 2000 SCSI controller for more than just tapes.
 Rough scan at 
http://sync.absd.org/vax/VAX-PK2K-preview-kit.pdf (the
 originals will be sent to someone who can do a better job)
 The pages led me to 
http://ftp.gwdg.de/pub/vms/ which includes some goodies:
 - 
http://ftp.gwdg.de/pub/vms/pk2k - uVAX-2k SCSI patches with source
 for boot roms, VMB & VMS
 - 
http://ftp.gwdg.de/pub/vms/ka420 - ROM patches for KA420/KA430 boot
 from >1GB disks
 - 
http://ftp.gwdg.de/pub/vms/dk-552/ - VMS 5.2 patch to allow to
 accept more SCSI disk devices
 (Starting a new thread in case there is (slightly) more general
 interest for anyone interested in using the onboard uVAX-2K SCSI
 controller more more than tapes (OK, OK, for anyone not running NetBSD
 on their uVAX-2K interested in etc etc) - have cross posted to cctalk
 & port-vax - hopefully not violating any conventions there)
 David
 ------------------------------
 Message: 2
 Date: Mon, 15 Mar 2021 16:41:54 +0100
 From: david raingeard <david.raingeard at gmail.com>
 To: Tom Uban <tom at figureeightbrewing.com>,? "General Discussion:
 ??? On-Topic Posts" <cctech at classiccmp.org>
 Subject: Re: Diversified Technology CAT904 80286 single board PC
 Message-ID:
 ??? <CAFvDS1SvQZFE_dzGQaheyLRpFqh-ZqFZyyWpBaMg_D22gZ+8kA at mail.gmail.com>
 Content-Type: text/plain; charset="UTF-8"
 i rather do? what doe with ibm dos
 Le lun. 15 mars 2021 ? 16:23, Tom Uban via cctech <cctech at classiccmp.org> a
 ?crit :
  It dawned on me that I probably just need to
change a BIOS setting. I
 haven't dealt with PCs in so
 long I've forgotten what to do...
 I would still like to find a manual if someone has one.
  I have a Diversified Technology CAT904 80286
single board PC in a system 
 with a 5.25" floppy drive
 running DOS.
  I would like to switch the system to use a
3.5" drive and am wondering 
 if anyone has a manual for
 the dip switch settings for this board or if I can simply add a 3.5" drive
 as a 2nd device on the
 floppy cable (guessing not without switch changes)?
  --tnx
 --tom 
 
 ------------------------------
 Message: 3
 Date: Tue, 16 Mar 2021 06:04:44 +0000
 From: Lars Brinkhoff <lars at nocrew.org>
 To: Don Stalkowski via cctalk <cctalk at classiccmp.org>
 Subject: Re: PDP-10 I/O notes
 Message-ID: <7wzgz3zlab.fsf at junk.nocrew.org>
 Content-Type: text/plain
 Don Stalkowski wrote:
  For what it's worth I've posted some
notes on PDP-10 I/O from a course
 taught by Mike Bennett at UWO in the early 1970s. 
 Thank you!
 Interesting to see the DECtape file structure format.
 ------------------------------
 Message: 4
 Date: Tue, 16 Mar 2021 09:48:33 -0500
 From: Tom Uban <tom at figureeightbrewing.com>
 To: "General Discussion: On-Topic and Off-Topic Posts"
 ??? <cctalk at classiccmp.org>
 Subject: who collects modems?
 Message-ID:
 ??? <d22a7559-5c13-28e5-eec0-b1587b5c5a79 at figureeightbrewing.com>
 Content-Type: text/plain; charset=utf-8
 Clearing out stuff at my space, I have the following modems:
 NEC UltraLite-Series Image Modem Plus w/box
 CTS Datacomm 2424 ADA modem w/box
 Scout Plus External Data/Fax modem w/box
 Digital DF03 modem
 Any offers?
 --tom
 ------------------------------
 Message: 5
 Date: Tue, 16 Mar 2021 11:23:28 -0500
 From: Jay Jaeger <cube1 at charter.net>
 To: Josh Dersch via cctalk <cctalk at classiccmp.org>
 Subject: Re: Any info on a Western Peripherals DC-230 disk controller?
 Message-ID: <0877749a-9d01-466e-9e59-854977e13808 at charter.net>
 Content-Type: text/plain; charset=utf-8; format=flowed
 I may have a little info - but the info is in storage, and it is just a
 "Western Peripherals Instruction Reference Card", apparently referring
 to the DC-230, PDP-11 and TC-130 (the latter being a tape controller,
 for which I do have some doc.)
 Once the weather warms up again - say, maybe this weekend, I'll trot off
 to storage, bring it back and scan it.
 Back in the 1970's the UW Madison CS Department's 11/20 had a 3rd party
 disk controller of some sort - one pack removable, one fixed, but I
 don't remember who made it (might have been Wangco).
 JRJ
 On 3/12/2021 5:02 PM, Josh Dersch via cctalk wrote:
  Any ideas what this disc controller is?
https://www.ebay.com/itm/PDP-11-Backplane-Western-Peripherals-DC-230-Disk-C…
 Can't find much about this on the 'net, other than that it was a controller
 for Diablo/Pertec style drives -- no idea if it's an RK11 clone or
 something else entirely. Looks to be suitable for a PDP-11/20 given the
 little notch missing from the side there, and the lack of a separate power
 harness for the backplane.
 - Josh
 
 End of cctalk Digest, Vol 78, Issue 16
 **************************************