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  • jackrubin's Avatar
    October 13th, 2018, 04:57 AM
    Here's how the pros do it - https://www.youtube.com/watch?v=BFqNP8VqoPs Strange Parts has many cool videos about manufacturing in China - worth a...
    16 replies | 660 view(s)
  • PG31's Avatar
    October 11th, 2018, 09:11 AM
    I have the mux cable and breakout board, I can now get a VCP prompt but my A900 shows as having 0MB memory. I had a spare memory controller an 3/4MB...
    1 replies | 449 view(s)
  • PG31's Avatar
    October 11th, 2018, 04:45 AM
    PG31 replied to a thread HP 1000/A900, with 7937 HDD in Other
    I have the mux cable and breakout board, I can now get a VCP prompt but my A900 shows as having 0MB memory. I had a spare memory controller an 3/4MB...
    42 replies | 3863 view(s)
  • jackrubin's Avatar
    October 9th, 2018, 02:49 PM
    jackrubin replied to a thread PDP8/m fix before use... in DEC
    Lyle just replied to me and told me that while he would hope to (someday) update GTTY, for now he runs it using DOSBox from both Windows and Linux...
    14 replies | 557 view(s)
  • jackrubin's Avatar
    October 9th, 2018, 12:22 PM
    jackrubin replied to a thread PDP8/m fix before use... in DEC
    Just to be clear, Lyle Bickley wrote GTTY - glass teletype - using Dave Dunfield's micro-C compiler. It's a nice lightweight terminal program for the...
    14 replies | 557 view(s)
  • Lou - N2MIY's Avatar
    October 4th, 2018, 03:04 AM
    Lou - N2MIY replied to a thread H851 contacts in DEC
    Tim, You would be pleased to know that the H803 in the photo that I sent Roland was one salvaged from the Applicon system backplanes you gave...
    12 replies | 813 view(s)
  • Lou - N2MIY's Avatar
    October 3rd, 2018, 03:02 AM
    Lou - N2MIY replied to a thread H851 contacts in DEC
    Roland, Beautiful work! I imagined that the original H851 was likely made by splitting an H803 into quarters as you have done. Not only did...
    12 replies | 813 view(s)
  • Lou - N2MIY's Avatar
    September 26th, 2018, 03:02 AM
    Lou - N2MIY replied to a thread OS/8 programming overview? in DEC
    It won't work because the DECMate II needs the slushware. The best way to make bootable DECMate II floppies are from images and Dave D.'s Imagedisk....
    12 replies | 551 view(s)
  • jackrubin's Avatar
    September 25th, 2018, 07:47 PM
    jackrubin replied to a thread OS/8 programming overview? in DEC
    How about this? http://bitsavers.trailing-edge.com/pdf/dec/pdp8/os8/OS8_Handbook_Apr1974.pdf You'll definitely be chewing on this one for a...
    12 replies | 551 view(s)
  • jackrubin's Avatar
    September 25th, 2018, 06:32 PM
    jackrubin replied to a thread OS/8 programming overview? in DEC
    Here's the place to start - http://bitsavers.trailing-edge.com/pdf/dec/pdp8/handbooks/IntroToProgramming1969.pdf ...
    12 replies | 551 view(s)
  • Lou - N2MIY's Avatar
    September 24th, 2018, 03:26 PM
    Lou - N2MIY replied to a thread VT320 problems solved in DEC
    Al, This may be heresy, but why not use the opportunity to replace the MMJ jack with a normal 6P6C jack? Then you will not need to buy the...
    3 replies | 239 view(s)
  • billdeg's Avatar
    September 21st, 2018, 06:00 AM
    billdeg replied to a thread SFD-1001 not formatting in Commodore
    The easiest way to do this is to use BASIC to make it think it's drive 0 of an 8050, which is single sided. I can't find it at the moment...
    64 replies | 2289 view(s)
  • billdeg's Avatar
    September 20th, 2018, 07:43 PM
    billdeg replied to a thread SFD-1001 not formatting in Commodore
    I would not expect disk doctor 64 work on an SFD-1001. Did you try loading https://www.vintagecomputer.net/commodore/SFD-1001/sfd-1001%20test.PRG ...
    64 replies | 2289 view(s)
  • jackrubin's Avatar
    September 19th, 2018, 05:59 PM
    You and me both! http://www.computerarium.org/doku/doku.php?id=ac_inlet_filter_rebuild
    56 replies | 10759 view(s)
  • jackrubin's Avatar
    September 19th, 2018, 09:00 AM
    Those panels mount on the inside of the back cover (as dust covers?) -
    56 replies | 10759 view(s)
  • billdeg's Avatar
    September 17th, 2018, 06:57 AM
    billdeg replied to a thread SFD-1001 not formatting in Commodore
    Digitalman - please try to make a post without moderation. I bumped you up to 11 posts to give you member access. I assume it'll change your title...
    64 replies | 2289 view(s)
  • billdeg's Avatar
    September 17th, 2018, 06:53 AM
    billdeg replied to a thread SFD-1001 not formatting in Commodore
    Basically I think I should read this thread more carefully. Sorry using the mobile ap is clunky and now I am home at my main PC to be more thorough...
    64 replies | 2289 view(s)
  • billdeg's Avatar
    September 17th, 2018, 04:55 AM
    billdeg replied to a thread SFD-1001 not formatting in Commodore
    I uploaded it here (D80 and .prg): http://vintagecomputer.net/commodore/SFD-1001/ It could be the write protect sensor? Not sure if I remember...
    64 replies | 2289 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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