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  1. G

    Connect modern keyboard to VT100

    There’s this one, discussed not long ago: https://forum.vcfed.org/index.php?threads/find-a-vt125.1250309/
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    California RK05 emulator/tester v2 and accessories

    Although I’ve had some thoughts about this, probably not an RL emulator anytime in the near future. I don’t have any vintage hardware to connect to an RL01 or RL02
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    California RK05 emulator/tester v2 and accessories

    A number of RK05 Emulator/Tester v2 kits are now available. This is an updated version of the v1 emulator that was available in May. More information is available on github, here: https://github.com/G-Wiley/RK05_Emulator_Tester_System_v2 I’m still adding files to github, so more will be...
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    DF32/DS32 Platter Emulation

    Thanks, Mike. No plans to modify the RK05 emulator for this
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    DF32/DS32 Platter Emulation

    Both emulators, Vince’s and Dave’s, look very nice. Seems like one of them could be replicated. No need to make a 3rd one.
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    DF32/DS32 Platter Emulation

    Probably not many DF32's remaining in the world, and I'd imagine platter/drum interfaces would vary a lot depending on specific hardware configurations. You're looking to emulate this part? It might be possible to make this using the main board of the RK05 emulator as the hardware platform and...
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    Mystery Machine

    Be careful of that. Many of us have first reformed the big electrolytics and reformed or replaced the smaller ones in our vintage equipment to avoid damage after not being powered for many years. Here’s a recent post on that topic…...
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    RK8-E debugging

    Interesting fault given that so much other stuff seems functional. Is this the wrong cylinder address repeatable every time through the scope loop? Thanks for sending the timing details. I can create a seek loop sequence to cylinder 226 in the RK05 tester to observe the bus signals. Very...
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    RK8-E debugging

    Possibly a marginal threshold issue with the Chinese parts, although I'd think there would be well-defined digital level in this circuit. I had issues with Chinese counterfeit parts that had threshold voltages that were quite far off the mark. Maybe your parts have something like the Joyhot...
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    RK8-E debugging

    I loaded the M7104, M7105, and M7106 from so-much-stuff into EasyEDA to make it easier to trace RK8E signals. I believe the permissions of the imported files might be set to Public. Can check later when I’m on the computer. Google Vince M7104 and it might show up
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    RK8-E debugging

    The Doug Jones University of Iowa Omnibus Module page says: Two board set replaces RK8E on PDP-8/A systems (never released? several survive)
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    RK05 Drive and Controller Work

    My preference would be to keep the drive in its vintage form as much as possible. Isn't it just a NiCd pack? NiMH should suffice as a replacement. If the battery needs to be replaced because if unavailability, I'd probably look into designing an active charging and regulating circuit around a...
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    RK05 Drive and Controller Work

    Do you think it would be useful to use an RK05 emulator configured as a tester to exercise the drives, read/write loops and seek loops, etc., or are there a sufficient number of diagnostics that run on a PDP-11 to do this? It would be great to have fewer RK05's from becoming scrap or parts...
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    PDP-8/L Module Utilization Question

    Mine has an M216 in D10 and an M113 in D11. (The power supply was removed for restoration when this photo was taken) Boards with blank yellow stick dots have been cleaned and tested on the flip chip tester. Boards with an "o" on the yellow dot are replaced from the spares kit. Not shown here...
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    H214 core memory single bit error in single location mystery

    I'm not an 11/05 expert, but you could probe the output of the sense amplifier and see if the pulse is weak or non-existent when writing and then reading that location. Need to write first so you'll have the core flip when it's read. Could toggle in a simple scope loop program. Also would be...
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    Check Binary file xferred with Kermit

    I think what AndrewZ says is correct. The last time I used Kermit was probably in 1985. I thought the command was something like byte mode, but I searched a Kermit command reference and it appears that SET FILE TYPE BINARY is how it's done. I'd trust the actual command reference better than my...
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    PDP-11/05 DC Regulator Module (5409728) cable routing

    As mentioned, the PDP-8/M has the same regulator board and same deficient +5V power wiring and burning around the +5V Mate-n-Lok connector pin. I also implemented Roland's fix of doubling up the power wiring in my 8/M. It works great!
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    Automated backplane tracing tool

    It might be easier to find a cost-effective and electrically compatible solution with individual P and N MOSFETs. The problem is the two parts would be larger than the Si1553. It would be probably easier to find alternate parts later if you use separate parts, in case the dual MOSFET is out of...
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    Cleaning RK05 (2315-style) disk packs

    Ah, thank you! This is what I remember reading. Definitely remember the photos of the kitchen countertop. From your description and what Al said it seems quite important to disassemble the cartridge carefully to inspect both sondes of the platter.
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    Cleaning RK05 (2315-style) disk packs

    Somewhere, I think it was in this forum, I read a detailed post that describes a process for cleaning RK05 disk pack/cartridges. Does anyone recall seeing this post? It's possible that I just imagined it was here and was on a web page. There were photos of cartridges on a kitchen counter and I...
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