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
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
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
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
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
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
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
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
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
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
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
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'
[ 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 right
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
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
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
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
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
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,
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 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
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
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
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",
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
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
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