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  • 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...
    115 replies | 10513 view(s)
  • AK6DN's Avatar
    June 14th, 2019, 07:48 PM
    AK6DN replied to a thread PDP-11/34A interrupt problem in DEC
    The basic TU58 serial protocol (RSP - Radial Serial Protocol) does not have an flow control. The master sends, and the slave must keep up, no option....
    28 replies | 650 view(s)
  • AK6DN's Avatar
    June 13th, 2019, 09:49 PM
    AK6DN replied to a thread PDP-11/34A interrupt problem in DEC
    Very good progress indeed! With respect to RX01/2, the disk images used under SIMH need to be physical sector-by-sector images of the disk;...
    28 replies | 650 view(s)
  • AK6DN's Avatar
    June 13th, 2019, 07:56 PM
    AK6DN replied to a thread PDP-11/34A interrupt problem in DEC
    I will correct my error in above ... the M9312, when started from a poweron, forces the ODT start address PC and supplies a PS with a value of...
    28 replies | 650 view(s)
  • AK6DN's Avatar
    June 13th, 2019, 06:43 PM
    AK6DN replied to a thread PDP-11/34A interrupt problem in DEC
    Actually the 11/34,etc ODT code runs at IPL<0>. The PSW is not loaded at all. The hardware relies on a bus INIT to clear all device interrupt bits. ...
    28 replies | 650 view(s)
  • AK6DN's Avatar
    June 13th, 2019, 09:09 AM
    AK6DN replied to a thread PDP-11/34A interrupt problem in DEC
    That is very good progress. The byte access to address 177234 (a reserved/unused I/O page address) is very strange. It would appear you are...
    28 replies | 650 view(s)
  • AK6DN's Avatar
    June 12th, 2019, 04:09 PM
    AK6DN replied to a thread PDP-11/34A interrupt problem in DEC
    Your code: 1000 / 012700 1002 / 176500 1004 / 012760 1006 / 000100 1010 / 000000 1012 / 000777
    28 replies | 650 view(s)
  • AK6DN's Avatar
    June 12th, 2019, 12:08 PM
    AK6DN replied to a thread PDP-11/34A interrupt problem in DEC
    XXDP should be able to be loaded, booted, and run without using interrupts at all. So the issue that you can't do that should be #1 on the list right...
    28 replies | 650 view(s)
  • AK6DN's Avatar
    June 4th, 2019, 01:04 PM
    AK6DN replied to a thread Bring 2.11BSD_rq.dsk to disk in DEC
    Well I think that program's interpretation of the MBR is totally bogus, it is not a Windows disk. That being said, the first bytes of block 0 are...
    4 replies | 174 view(s)
  • AK6DN's Avatar
    June 3rd, 2019, 05:52 PM
    Well, I sent an email to that address on 5/29 indicating I'd like two board kits as well, and I have not yet received a response. Is this expected? ...
    69 replies | 11410 view(s)
  • AK6DN's Avatar
    June 1st, 2019, 01:14 PM
    I bought a similar PDP-8m in very good condition (ie, perfect front panel) with similar boards, but with two core arrays for a total of 16KW core....
    2 replies | 256 view(s)
  • AK6DN's Avatar
    May 27th, 2019, 06:34 PM
    AK6DN replied to a thread New Atex PDP-11/34 in DEC
    That is the venerable BA11-K box. Search for schematics in here: http://www.bitsavers.org/pdf/dec/unibus/ (search for BA11-K). The manuals are...
    10 replies | 918 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