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  • AK6DN's Avatar
    November 15th, 2019, 11:36 PM
    AK6DN replied to a thread WiFi Modem for VT-100/102? in DEC
    I would just start out using a standard USB/serial cable on your RPI and setting up the RPI to spawn a login shell on that line (see my post #4...
    14 replies | 280 view(s)
  • AK6DN's Avatar
    November 15th, 2019, 11:06 PM
    AK6DN replied to a thread WiFi Modem for VT-100/102? in DEC
    You CANNOT use TTL levels with the RS232 connector on the VT10x. It will be RS232 levels only (+/- 3V up to 25V). It is NOT TTL levels. You have to...
    14 replies | 280 view(s)
  • AK6DN's Avatar
    November 15th, 2019, 06:32 PM
    AK6DN replied to a thread WiFi Modem for VT-100/102? in DEC
    No, RS232-C (aka ANSI/EIA-232-E) is not TTL levels but rather +3V..+25V and -3V..-25V levels. Probably the simplest solution is to use a standard...
    14 replies | 280 view(s)
  • AK6DN's Avatar
    November 12th, 2019, 09:52 AM
    Yeah that is a change I made to the DEC standard BIN loader I use all the time. Here: https://www.ak6dn.com/PDP-8/MAINDEC/Binary_Loaders/ as...
    80 replies | 13424 view(s)
  • AK6DN's Avatar
    November 8th, 2019, 06:48 PM
    AK6DN replied to a thread New to me Rainbow 100A and VR201 in DEC
    The technical manual says ROM0 lives at 0xFA000, ROM1 lives at 0xFC000, ROM2 lives at 0xFE000 in 8088 address space. Each ROM is 8KB. Simple program...
    32 replies | 2646 view(s)
  • AK6DN's Avatar
    November 7th, 2019, 11:18 AM
    AK6DN replied to a thread Q/Q and Q/CD pinouts in DEC
    Go here: https://storage.googleapis.com/raremaps/img/xlarge/43898.jpg zoom and scroll to lower left corner. Measurex was 'across the street' from...
    12 replies | 517 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 August 10th, 2019 at 03:39 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 June 2nd, 2019 at 12:33 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

Categories
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

Categories
DEC