What brought the project back to life? Is there a curriculum or student
interest in computing history there?
On Thu, Feb 2, 2023, 5:28 PM William Sudbrink via cctalk <
cctalk@classiccmp.org> wrote:
> After more than three years, U of Iowa's PDP-8 project active again
>
Are you referring to this board listed below?
M7165 Qbus SDI disk adapter
That's not SCSI. That's one board of a two board set, the other being the
M7164, that are an SDI controller for RA6x, RA7x, RA8x, RA9x drives.
On Sat, Feb 4, 2023, 1:22 PM John Maxwell via cctalk
wrote:
> Hi David,
> I
Perm magnet. Those neodynium magnets are powerful, keep them away from
disks.
C
On 2/3/2023 9:26 PM, Tom Hunter via cctalk wrote:
Chris, what kind of magnet did you use?
If it was an electromagnet I could imagine that you caused physical damage
by something heating up sufficiently. If it was a
Hi David,
If still available, I'd like the uVII RAM and CPU and SCSI adapter. Any
interest in shipping to the USA? I'd pay for freight. I have been looking for a
Qbus SCSI adapter for a while now. Even if that's the only item that you are
sending.
Thanks,
-John
-Original Message--
Running a non-reformatted disk through Dave G's mfm device got me the
following after running a mfm_write to the whole disk followed by an
mfm_read:
Expected 312120 sectors got 311766 good sectors, 282 bad header, 72 bad data
0 sectors marked bad or spare
49 sectors corrected with ECC. Max bits
Wow, this is interesting Dave. Took one of the "formatted badly" disks
and did a write of your file.
root@beaglebone:~/mfm# ./mfm_write --emulation RD54_A -d3 -c1224 -h15 -s 17
Board revision C detected
Then a read of the disk:
root@beaglebone:~/mfm# ./mfm_read --analyze -e rd.dsk
Board revis
Yes, the no autoformat option allows me to specify RD54.
C
On 2/3/2023 12:14 PM, Nigel Johnson Ham via cctalk wrote:
On 2023-02-03 12:09, Chris Zach via cctalk wrote:
Decided to spend some time working on my 11/73 with MFM drives.
Currently it has one of my RQDX3 boards (I have 3, 1 in atti
Decided to spend some time working on my 11/73 with MFM drives.
Currently it has one of my RQDX3 boards (I have 3, 1 in attic), a 40mb
ST412 drive (the half height Seagate whatever) which works fine. No
issues there.
I'm trying to format an RD54 compatible drive and am running into major
issu
Some other good sources of information:
PDP-11 Diagnostic Database - module "ZRQC"
http://www.retrocmp.com/tools/pdp-11-diagnostic-database/202-pdp-11-diagnostics-database
RQDX3 firmware source code. Not sure what version this is.
http://www.bitsavers.org/pdf/dec/qbus/rqdxx/rqdx3_src.zip
On 04/02/2023 14:37, Glen Slick via cctalk wrote:
On 2023-02-03 22:48, Chris Zach via cctalk wrote:
Is it just the ROMs, or also some HW changes?
Do we have backup of the newer versions?
http://www.dunnington.info/public/DECROMs/
http://www.dunnington.info/public/DECROMs/ROMlist
It's just th
On Sat, Feb 4, 2023, 4:44 AM emanuel stiebler via cctalk <
cctalk@classiccmp.org> wrote:
> On 2023-02-03 22:48, Chris Zach via cctalk wrote:
>
> > 2) There are at least two RQDX3 ROM sets. The earlier one does not
> > support the RX33 floppy and doesn't give any info during formatting. The
> > lat
On 2023-02-03 22:48, Chris Zach via cctalk wrote:
2) There are at least two RQDX3 ROM sets. The earlier one does not
support the RX33 floppy and doesn't give any info during formatting. The
later version (Version 4) does support the RX33 and is a lot nicer.
Is it just the ROMs, or also some H
On 2023-02-03 11:57, Chris Zach via cctalk wrote:
This is a Maxtor 2190. The RD54 base disk. I've been having major
problems trying to format them on my RQDX3, I'll post that adventure in
a bit. In a nutshell the drives only partially format then error out. On
Dave G's MFM emulator all the tra
On 2023-02-03 12:09, Chris Zach via cctalk wrote:
Decided to spend some time working on my 11/73 with MFM drives.
You don't have a MicoVAX 2000 sitting around?
Did you use the RD54 by any chance in a different system, and low level
formatted it there?
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