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  • AK6DN's Avatar
    July 11th, 2019, 02:23 PM
    AK6DN replied to a thread Build your own PDP 8I, Part 4.. in DEC
    Search this forum for "Rod (Panelman) Smallwood" (or posts by user PanelMan) ... maker of 100% accurate PDP-8efm plex panels. Not the logic board,...
    159 replies | 13404 view(s)
  • AK6DN's Avatar
    July 10th, 2019, 02:03 PM
    I have these two. Don't remember where I got them. MAINDEC-8E-D8AC-D-D.pdf MAINDEC-8E-D8AC-D-PB.bin
    3 replies | 127 view(s)
  • AK6DN's Avatar
    July 9th, 2019, 09:17 PM
    AK6DN replied to a thread UC17 question in DEC
    One thing I have found with RSTS is it is sensitive to the total physical size of the disk it resides on, in terms of file system. If you setup a,...
    38 replies | 562 view(s)
  • AK6DN's Avatar
    July 9th, 2019, 07:41 PM
    AK6DN replied to a thread UC17 question in DEC
    This is a really old version: PDP-11 simulator V3.9-0 Go to here: https://github.com/simh/simh to get the latest
    38 replies | 562 view(s)
  • AK6DN's Avatar
    July 8th, 2019, 08:45 PM
    AK6DN replied to a thread Atex PDP-11/34 in DEC
    Measured with respect to what reference? System GND? If you measure from -15V (on meter v-) to +15V (on meter v+) yes that would read +30V...
    24 replies | 812 view(s)
  • AK6DN's Avatar
    July 8th, 2019, 02:12 PM
    AK6DN replied to a thread Slow XXDP 2.5 on Emulex UC07? in DEC
    I find similar behavior running XXDPv2.5 on my 11/44 with a UC17 MSCP controller with attached SCSI drives. I have both SEAGATE 2.1G SCSI drives and...
    2 replies | 78 view(s)
  • AK6DN's Avatar
    July 6th, 2019, 03:17 PM
    AK6DN replied to a thread Extended Bootloader Blues in DEC
    I haven't assembled my combo card yet for my PDP-8m, but I might also suggest it depends on where the combo board is within the backplane, and what...
    17 replies | 670 view(s)
  • AK6DN's Avatar
    July 2nd, 2019, 08:20 PM
    AK6DN replied to a thread UC17 question in DEC
    You can also use PDP11GUI to download the .BIC (basically a .BIN file but 'chainable' in XXDP parlance) directly thru its download a binary image...
    38 replies | 562 view(s)
  • AK6DN's Avatar
    July 2nd, 2019, 06:49 PM
    AK6DN replied to a thread UC17 question in DEC
    If you are interested I have a very basic MSCP test program I wrote for checking out my UC17 when I first got it. Located here: ...
    38 replies | 562 view(s)
  • AK6DN's Avatar
    July 1st, 2019, 08:31 PM
    AK6DN replied to a thread UC17 question in DEC
    My 11/44 is rock solid. Never behaves, never have to reseat/wiggle boards or any of that stuff. Same for connectors. My 11/34 on the other hand is...
    38 replies | 562 view(s)
  • AK6DN's Avatar
    July 1st, 2019, 07:39 PM
    AK6DN replied to a thread UC17 question in DEC
    Well ... I have a UC17 MSCP in my 11/34, and a UC18 MSCP/TMSCP in my 11/44, and I follow the directions in the Emulex manual p.4-33...
    38 replies | 562 view(s)
  • AK6DN's Avatar
    June 26th, 2019, 03:06 PM
    AK6DN replied to a thread PDP-8/e earth leakage problem in DEC
    I had a problem with my PDP-8m tripping the GFI outlet (US version of RCD I believe) it was plugged into. All my available garage circuits were GFI,...
    12 replies | 533 view(s)
  • AK6DN's Avatar
    June 23rd, 2019, 01:37 PM
    AK6DN replied to a thread Build your own PDP 8I, Part 4.. in DEC
    Consider a generic schematic system that has the capability of producing netlists for various simulators (like verilog or vhdl). KiCAD might be a...
    159 replies | 13404 view(s)
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Recent Entries

RX01/RX02 Drive Emulator using Arduino and a custom shield

by AK6DN on February 4th, 2017 at 09:00 PM
Late in 2015, after retiring from full time work, I dug out my half-finished-never-quite-got-to-work PIC18F4550-based RX02 emulator project from about 10 years ago. It was based on the Dickman RXM code base ported to a USB capable PIC18 device. The intent was to emulate the RX02 device interface with a USB serial backend to a PC running my TU58EM code, kind of like a version of serial disk for the RX interface, with TU58EM as the server. For various reasons I was never able to get a stable USB comm

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Updated May 1st, 2019 at 12:47 PM by AK6DN

Categories
DEC

RX01/RX02 Emulator Passes PDP-11 Diagnostics!

by AK6DN on February 3rd, 2017 at 02:54 PM
So, mega success. I was finally able to get my RX02 emulator passing all three DEC RX02/RX211 diagnostics:

(1) ZXRDC0 : RX02 SS PERF EXER (it has been doing this for a while)
(2) ZRXEA0 : RX02 FMTR PROG (just tonight!)
(3) ZRXFB0 : RX02 FUNCTION-LOGIC TEST (just tonight!)

ZXRF the RX02/RX211 hardware function/logic diagnostic is the big one. Fooling the DEC diagnostic with the RX02 emulator so that this test passes 100% turned out to be a non-trival debugging

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Updated June 2nd, 2019 at 11:33 AM by AK6DN

Categories
DEC

DEC XXDP Image Manipulation - xxdpdir

by AK6DN on February 3rd, 2017 at 02:47 PM
So ... over the past month I was able (finally) to finish and test my version of XXDPDIR (actually xxdpdir.pl plus an XXDP.pm Perl module) that supports access to RX01 and RX02 media images (as well as simple linear block drives like TU58, MSCP, RL02, etc) so I could now build RX01 and RX02 bootable XXDP file systems just like I did for TU58 bootable XXDP filesystems. It is written in plain jane Perl, so I run it under CYGWIN 32b on Win7 64b, but it will run on just about any OS that supports Perl,

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Updated February 4th, 2017 at 07:02 PM by AK6DN

Categories
DEC

PDP-11 (or 8) worthwhile without disk drives?

by AK6DN on February 3rd, 2017 at 02:43 PM
There are several options for both PDP-11 and PDP-8 that don't use legacy spinning magnetic media.

PDP-11 TU58EM TU-58 emulator. Requires a Windows/Linux PC or equivalent to run the emulator server code (see https://github.com/AK6DN/tu58em) and an extra serial port on the PDP-11 as the hardware interface. Capable of running XXDP diagnostic images (useful for debug, not much else) but also large enough for a minimal RT-11 system. Search this forum for TU58EM, should find lots of activity.

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Updated February 4th, 2017 at 07:02 PM by AK6DN

Categories
DEC