On 1/25/2022 9:18 AM, Paul Koning via cctalk wrote:
On Jan 24, 2022, at 10:27 PM, Gary Oliver via cctech
wrote:
...
As to the real reason I was doing this: Most of my tapes are un-boxed and have suffered
being in a dusty area (before I got them) with the dust forming a sort of 'crust' o
Hello Retrofolks,
I have a 1/2" 9-track magtape which is missing a BOT marker.
Does anyone have a recommendation for a reflective tape to use to
replace the BOT marker?
I was looking at
https://www.amazon.com/Metalized-Polyester-Adhesive-Multiple-Available/dp/B07TXN8TD8,
but I have no idea
Hello Retronians,
I just saw some interesting DEC Professional items on eBay from
smhelectronics261 (https://www.ebay.com/sch/smhelectronics261/m.html):
1. Pro-350 (and presumably -325) video board
https://www.ebay.com/itm/294933607768
2. RD (hard disk) controller https://www.ebay.com/itm/2
Hello Retroovers,
Here's something interesting that Oleksii in Ukraine discovered.
While playing with a Fluxengine, he found that some RX50s have data,
stored in FM format, in a single sector the 81st track of the diskette.
For fun I went through my collection of original DEC distribution
di
Hello Classic fans,
Recently eBay seller smhelectronics261 posted a very interesting
prototype board: https://www.ebay.com/itm/295087630609
The description is "Dec Digital PRO 350/380 Professional Microvax II
Proto 54-16707 Collectors", and the board art mentions "MICROVAX SOFTCARD."
Does a
On 7/13/2022 3:02 AM, Paul Koning via cctalk wrote:
Does anyone know anything about this card? Especially curious is the
daughtercard connector: is it just for RAM expansion or is the daughtercard
necessary for card operation?
Daughtercard almost looks like a Pro memory board, but those we
On 9/9/2022 5:39 PM, Warner Losh via cctalk wrote:
On Fri, Sep 9, 2022, 3:24 PM Lee Gleason via cctalk
wrote:
Took some pictures of the MicroVAX CTI card, and another odd card I
got - an 8086 CTI smartcard. See 'em both at
https://rsx11.blogspot.com/2022/09/microvax-and-8086-smartcards-f
Hello Chuck and Jay,
I took this off list because I'm not sure people would be interested.
I made a simple board with level shifters to allow me to use a PJRC
Teensy 4.1 (https://www.pjrc.com/store/teensy41.html) with a Pertec
interface. I called it a "Pertexus".
The Teensy is really nice b
Chris,
I, too, tried a similar thing.
It mostly worked until there was a need to switch quickly between the
two drives (booting the diagnostics, for example). Then it worked
strangely.
What I believe may be going on is that the Pro is relying on the fact
that, although there appear to be 2
Hello CCtalk,
I recently bought the mortal remains of a Data General 602X magtape
drive on craigslist.
Apparently it had been stored outside. When I got it it had mudwasp
nests and mud all over it and everything that could rust had.
When it was decomissioned it was just cut out, so it's mi
Paul,
A couple of years ago I did design and build a new daughterboard with
modern SRAM that supports up to 2 MiB of RAM on the PC/380 and up to 512
KiB on the PC/350. https://oshpark.com/shared_projects/eBNkBw8x
It even works.
I never made a push to publish it because by the time I got to i
On 7/29/2023 12:36 PM, emanuel stiebler wrote:
On 2023-07-29 13:57, Bjoren Davis via cctalk wrote:
I never made a push to publish it because by the time I got to it the
parts (Cypress CY62167G-45ZXI SRAM and ATF1504AS-10AU100 CPLD) had
become unobtainable.
The SRAM can still be find, but
If it helps, I bought a copy of the DEC Professional 350 Field
Maintenance Print Set (MP-01394) on eBay a few months back.
I've scanned it but I've been waffling about where to post it. Scanned
@600DPI with lossless compression it's huge: 1 GB. Saved as an
"optimized" PDF (with very little vi
On 20/10/2019 17:27, Rob Jarratt via cctalk wrote:
>/Manx lists MP-01394-00 as the Field Maintenance Print Set for the DEC />/Professional 350. I can't find this online and I was wondering if
anyone has />/a scan of it by any chance? />//>//The Field Maintenance Print Set for the Professional 380
I have a retail boxed set "Microsoft Visual Studio 6.0 Professional
Edition Upgrade" (P/N 659-00145).
It's stuffed with CDs, some of which I seem to remember were sent to me
after I mailed in some coupons.
There's not much paper documentation -- a "Microsoft Visual Studio
Resource Guide", "G
Hello Classicquers,
I have some vintage DEC equipment (terminals and small systems) that I
need to clean up.
I'm looking for advice on how to clean the plastic bits.
Specifically, I want to know if anyone has a good solution to preserve
labels that are attached to such plastic bits while the
I've successfully used a DREM-2 (https://www.drem.info/) with my Pro 380
for both floppy and hard disk emulation.
--Bjoren
On 1/14/2021 2:14 PM, Bill Gunshannon via cctalk wrote:
On 1/14/21 1:52 PM, Paul Koning via cctalk wrote:
On Jan 14, 2021, at 1:42 PM, Chris Zach wrote:
...
Is there
I should point out that, as far as I know, you can't use the floppy and
hard disk emulation of the DREM-2 at the same time; it's one or the other.
--Bjoren
On 1/14/2021 8:59 PM, Cameron Kaiser via cctalk wrote:
I've successfully used a DREM-2 (https://www.drem.info/) with my Pro 380
for both f
I had no problem expanding disk 177-20.
I did it on a Linux system using wteledisk (which I got from
https://github.com/jmechnich/wteledsk.git) using this script:
for d in
~/downloads/decpro_software/ftp.update.uu.se/pub/professional/PRO* ; do
newname=$(basename $d | tr [A-Z] [a-z])
I have two oddball CTI boards for my DEC Professional: a DEC-made CP/M
board (P/N 54-15641) and a board labelled "VIRTUAL MICROSYSTEMS PRO BD.
REV 1" which appears to be an x86 MS-DOS board (it contains an 8086, a
video controller and a bunch of RAM).
I've managed to get them both functional,
Hello All,
Does anyone have a copy of the DEC CTI Bus Technical Manual
(EK-00CTI-TM-002) I can scan?
If not, does anyone have an email address for Ken Wellsch or Megan
Gentry as they both appear to be authorities on the CTI bus (see
https://en.wikiversity.org/wiki/DEC_Professional_(computer)
I recently brought a PC350 back from the dead.
A good source of documentation for the F-11 is that for the 11/23 and
11/24 (e.g.,
http://bitsavers.org/pdf/dec/qbus/Digital_Microcomputer_Processor_Handbook_1979_80.pdf
chapter 3 "LSI-11/23 Processor" or
http://bitsavers.org/pdf/dec/pdp11/1124/E
Hello Paul and Rob,
The next thing I did was to hook up a logic analyzer to the address
lines on the ROM. This told me how far I got with the boot sequence
before it restarted.
I disassembled the ROM and have some portions of it semi-decoded so that
may be helpful. If you like I can send y
Rob,
Off list: I was wondering: you mentioned you have a printset for the
machine. Is it the one from bitsavers or it is another?
I ask because I'm the source of the one on bitsavers, but it is sadly
missing the "MP-01483-00 PRINT SET RCX50" subset.
I'm hoping someone has a printset that i
I have been looking at this and I think you are right. But the reason is
odd. It looks like the ROMs are never being selected by the ROM address
decode. I can't find on the printset anything that says what the boot
address would be, perhaps that is burned into the F11 chipset? However, from
th
[ off list ]
Rob,
Did you get my response to your question? Was it helpful? Do you have
more questions?
BTW I'm back at my home so I can instrument my machine again.
--Bjoren
On 5/16/2021 9:56 AM, Bjoren Davis via cctalk wrote:
I have been looking at this and I think you are
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