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  • gslick's Avatar
    May 23rd, 2020, 01:00 PM
    gslick replied to a thread decserver 100 in Other
    Does the EK-DSRVA-TM DECserver 100 Terminal Server Technical Manual contain schematics? Usually the schematics are in separate maintenance print...
    2 replies | 77 view(s)
  • PG31's Avatar
    May 23rd, 2020, 01:48 AM
    PG31 replied to a thread VT420 troubleshooting in DEC
    @DAve G4UGM, I checked out groups.IO and found that I was already a member..doh!!. I've just replied to a post from earlier this year about a PDP-11...
    19 replies | 575 view(s)
  • PG31's Avatar
    May 23rd, 2020, 01:44 AM
    PG31 replied to a thread VT420 troubleshooting in DEC
    Thanks for the info, I doubt I'll get time to work on this over the weekend now. My real job has taken over :( @Gary C, Glad you have made...
    19 replies | 575 view(s)
  • gslick's Avatar
    May 22nd, 2020, 04:13 PM
    Many years ago for a digital design course final lab project I built a simple 8-bit CPU using 74LS181 ALU chips. I used AM2911 for the microprogram...
    16 replies | 295 view(s)
  • PG31's Avatar
    May 21st, 2020, 10:34 AM
    PG31 replied to a thread VT420 troubleshooting in DEC
    pics of transformer
    19 replies | 575 view(s)
  • PG31's Avatar
    May 20th, 2020, 10:52 AM
    PG31 replied to a thread VT420 troubleshooting in DEC
    Hi Dave, I'm Paul.:) I've removed and cleaned the circuit board. I found the top of transformer T802 inside the terminal. Not 100% sure if this...
    19 replies | 575 view(s)
  • PG31's Avatar
    May 19th, 2020, 09:31 PM
    PG31 replied to a thread VT420 troubleshooting in DEC
    Thanks wupf and Qbus, great we now have a diagram:D. I have some experience fixing monitors (Zentec, Redifon, Newbury Data and Wyse mainly), albeit...
    19 replies | 575 view(s)
  • PG31's Avatar
    May 19th, 2020, 11:44 AM
    PG31 replied to a thread VT420 troubleshooting in DEC
    Thanks both, I have also asked on a couple of DEC Facebook groups. No joy yet. @Gary, you will find in the service guide a description of each...
    19 replies | 575 view(s)
  • Crawford's Avatar
    May 18th, 2020, 07:48 AM
    Crawford replied to a thread VHDL resources in DEC
    Jack, I’ve enjoyed ‘The Low Carb VHDL Tutorial’. I keep a copy on my iPad: http://ecse.bd.psu.edu/cmpen270/lab/vhdl-low.pdf -Crawford
    3 replies | 149 view(s)
  • Crawford's Avatar
    May 18th, 2020, 07:41 AM
    Crawford replied to a thread The Body Electric in DEC
    Hi Ray! Awesome work with the vt-100. There’s a reason those are the standard for emulation. At college we went from ASR33 teletypes to VT-100s....
    3 replies | 261 view(s)
  • jackrubin's Avatar
    May 18th, 2020, 07:15 AM
    jackrubin started a thread VHDL resources in DEC
    I know several people here are working with FPGAs in one form or another. Here are several texts by Pedroni which, for some reason, are available...
    3 replies | 149 view(s)
  • PG31's Avatar
    May 18th, 2020, 05:15 AM
    PG31 started a thread VT420 troubleshooting in DEC
    Does anybody have experience troubleshooting a VT420? I have one that does not display on screen when powered up but makes a continuous clicking...
    19 replies | 575 view(s)
  • jackrubin's Avatar
    May 16th, 2020, 09:54 AM
    It's an aspirational price.
    9 replies | 280 view(s)
  • PG31's Avatar
    May 14th, 2020, 12:21 AM
    PG31 replied to a thread A Homebrew MicroVAX II in DEC
    Very Cool:)
    16 replies | 553 view(s)
  • gslick's Avatar
    May 12th, 2020, 07:34 AM
    gslick replied to a thread VAXstation 4000 model 96 in DEC
    Also here: OpenVMS VAX 6.1 with OpenVMS Consolidated Software Distribution May 1994 https://archive.org/download/vaxvmscsd61
    14 replies | 477 view(s)
  • gslick's Avatar
    May 7th, 2020, 10:41 AM
    Even my high end BP Microsystems BP-1610 device programmer doesn't support TMS2716 +5V, +12V, -5V EPROMs. Maybe someday I'll pick up a Data I/O...
    44 replies | 1519 view(s)
  • gslick's Avatar
    May 5th, 2020, 12:56 PM
    Almost all of the lights in my house are in recessed cans. The majority of them are still the Philips 90W PAR38 halogen flood bulbs that were...
    25 replies | 624 view(s)
  • gslick's Avatar
    May 3rd, 2020, 10:34 AM
    Is this thread just a long way of saying 1TB or 2TB on a disk drive label does not mean any particular number of user visible sectors? From some...
    10 replies | 252 view(s)
  • gslick's Avatar
    May 3rd, 2020, 10:14 AM
    gslick replied to a thread DEC/Compaq DS-SWXRA-HC in DEC
    Just for reference, here is the relevant Linux PCMCIA driver code in /drivers/pcmcia/ds.c where I believe the missing or invalid CIS issue prevents...
    42 replies | 1457 view(s)
  • gslick's Avatar
    May 3rd, 2020, 10:03 AM
    gslick replied to a thread DEC/Compaq DS-SWXRA-HC in DEC
    As I mentioned back in post #31 of this thread I do not currently have any cards with original DEC labels on them. I do have one 2MB Mitsubishi...
    42 replies | 1457 view(s)
  • gslick's Avatar
    May 2nd, 2020, 05:32 PM
    gslick replied to a thread DEC/Compaq DS-SWXRA-HC in DEC
    A quick update on trying to read and write PCMCIA Linear Flash cards on a PC. I received a PCI add-in card Cardbus adapter today, based on the one...
    42 replies | 1457 view(s)
  • jackrubin's Avatar
    May 1st, 2020, 06:50 PM
    Using longer front panel cables will let you position the panel on top (or above) the chassis - a big help when you're trouble shooting or working...
    28 replies | 1331 view(s)
  • gslick's Avatar
    May 1st, 2020, 12:17 PM
    +1 I could understand viewing getting all of the possible updates installed for Windows 98SE, NT, 2000, XP as a challenge just for the heck of it...
    65 replies | 3035 view(s)
  • gslick's Avatar
    May 1st, 2020, 10:59 AM
    The 82355 is a BUS MASTER INTERFACE CONTROLLER (BMIC) That looks like something that is used on an EISA bus expansion board, and not something...
    8 replies | 410 view(s)
  • gslick's Avatar
    May 1st, 2020, 10:23 AM
    The link in the original posts lists the part numbers of the major chips: http://www.yjfy.com/Museum/net/EISA.htm from left to right intel...
    8 replies | 410 view(s)
  • gslick's Avatar
    May 1st, 2020, 07:32 AM
    gslick replied to a thread DEC/Compaq DS-SWXRA-HC in DEC
    There was probably never much available for USB connected PCMCIA Linear Flash reader / writer devices. Those would never have been a mainstream...
    42 replies | 1457 view(s)
  • gslick's Avatar
    April 29th, 2020, 09:15 PM
    gslick replied to a thread DEC/Compaq DS-SWXRA-HC in DEC
    After looking around a bit more it looks like on Linux distributions there is an mtd-utils package which is being actively maintained. The...
    42 replies | 1457 view(s)
  • gslick's Avatar
    April 29th, 2020, 08:26 PM
    It is appreciated that someone took one for the team and sacrificed the bound manuals to produce good quality scans. Those manuals seem fairly...
    16 replies | 2094 view(s)
  • gslick's Avatar
    April 29th, 2020, 12:19 PM
    You can always use PUSH PSW to save the current state of AC on the stack to examine it that way.
    80 replies | 1772 view(s)
  • gslick's Avatar
    April 29th, 2020, 10:09 AM
    Did you scan those non-destructively, or did you have to break the spines of the manuals? The scans are good quality and don't appear to be...
    16 replies | 2094 view(s)
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About RSX11M+

Basic Information

About RSX11M+
Biography:
Hi all...

I guess I should introduce myself as a retired R&D engineer who used, administered and serviced Digital PDP-11 machines in his working career. We used these to develop software for microprocessor based systems of various types, and for sale on PDP-11's as a VAR. [Value Added Reseller]

I've used too many PDPs to list, but it includes everything from a PDP-10 to PDP-11/70 and some VAX machines. Experience includes both UNIBUS and QBUS platforms.

My "Computer Museum" [as it's referred to by my friends] includes about 30 machines altogether, of which 10 or 15 are DEC. I am ashamed to say, none of these have been powered in the last 10 years.

This is about to change however, as I'm doing some of those "bucket list" projects I've been meaning to "get around to" for the last 20 years.

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Recent Entries

Review of "The MiniComputer in the Laboratory" Cooper

by RSX11M+ on June 20th, 2011 at 05:02 PM
Quote Originally Posted by RSX11M+ View Post
Code:
The MiniComputer in the Laboratory
            with examples using the PDP-11

Author: James W. Cooper

Publisher: John Wiley & Sons
ISBN: 0 471 01883-X
309 pages plus bibliography, appendices and index - 368 total

Cut to the chase
- of the books I've reviewed so far, this has one of the most concise, complete opcode views of the PDP-11 I've encountered. Not for it's thoroughness in covering the instruction set, but for imparting to the

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Review of "MINICOMPUTER SYSTEMS..." Eckhouse & Morris

by RSX11M+ on June 16th, 2011 at 04:45 PM
Quote Originally Posted by RSX11M+ View Post
Code:
    MINICOMPUTER SYSTEMS
            ORGANIZATION, PROGRAMMING, AND APPLICATIONS (PDP-11)" - Second Edition

Richard H. Eckhouse, Jr.
L Robert Morris

Prentice-Hall
ISBN 0-13-583914-9
On the cover: Diagram of the "Antikythera Mechanism" [1][2][3] 
491 Pages including Appendices and Index
This book would have been very useful had it been known to me in my early PDP-11 career. Not for programming, but for it's appeal to me

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Ancient PDP-11 Progamming in Opcode Book Review

by RSX11M+ on June 13th, 2011 at 07:29 PM
Quote Originally Posted by RSX11M+ View Post
Ok, got my first pick of a decent PDP-11 book for you guys.

Code:
"MACHINE AND ASSEMBLY LANGUAGE PROGRAMMING OF THE PDP-11" Second Edition - Arthur Gill

Prentice Hall
ISBN 0-13-541888-7
Hard cover 7x10
185 short pages plus Appendices and an Index.
The Pros:

This is targeted for programmers already experienced in high level languages, who may not have ever programmed in assembly or machine code before on any machine.

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DCT11-AA Microprocessor - MODE register bit 12 - TESTER / USER mode

by RSX11M+ on April 3rd, 2011 at 10:09 PM
The question of the purpose and action of bit 12, in the T-11's "MODE" register is not easy to answer from available information.

The only comments offered, come from a scant line or two in the T-11 User Guide EK-DCT11-UG

SECTION 4.2.4 - Tester or User Mode (MR<12>)

Tester mode is for Digital Equipment Corporation's use only. If mode register bit 12 is high, (MR<12>=1), user mode is selected.
Timing diagrams on page A-52 seem to

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Updated April 3rd, 2011 at 11:46 PM by RSX11M+

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Various Evaluation Module and Prototype Design Photos

by RSX11M+ on April 1st, 2011 at 12:11 AM
I thought it might be fun to put together an "album" of photos of original development boards and prototype designs in my collection. This is by no means complete, but I have to start somewhere and I'll add to it as I organize my stuff.

First is a Digital Equipment Corporation DCT11 Evaluation Module Kit.




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Updated May 4th, 2011 at 10:34 PM by RSX11M+ (Spelling corrections)

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