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  • AK6DN's Avatar
    December 2nd, 2017, 03:01 PM
    There are lots of variations of these around: https://www.amazon.com/StarTech-com-DB25-Serial-Cable-Adapter/dp/B00066HOWK There are also cabled...
    4 replies | 230 view(s)
  • AK6DN's Avatar
    November 18th, 2017, 12:32 PM
    AK6DN replied to a thread DEC register 8271 in DEC
    Probably the whim or experience of the designer that did that board. On the timing board they used the 74194 which could functionally replace the...
    9 replies | 445 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 10:00 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 February 5th, 2017 at 09:49 PM by AK6DN

Categories
DEC

RX01/RX02 Emulator Passes PDP-11 Diagnostics!

by AK6DN on February 3rd, 2017 at 03:54 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 February 4th, 2017 at 10:21 PM by AK6DN

Categories
DEC

DEC XXDP Image Manipulation - xxdpdir

by AK6DN on February 3rd, 2017 at 03:47 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 08:02 PM by AK6DN

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DEC

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

by AK6DN on February 3rd, 2017 at 03:43 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 08:02 PM by AK6DN

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DEC