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Type: Posts; User: glitch

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  1. Replies
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    130

    Nice! Good to see an open version of this, I...

    Nice! Good to see an open version of this, I believe someone else has made a rather expensive closed-source version.
  2. Replies
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    255

    Great to see folks still running BBSes, and other...

    Great to see folks still running BBSes, and other folks actually still using them!
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    174

    Yep, either wire wrap or 66/110 block...

    Yep, either wire wrap or 66/110 block termination. I've got a few sections of stranded, I believe it was originally for station cables on key system phones (where a 25-pair goes from the telephone to...
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    174

    Whatever you do, don't buy those cheap breadboard...

    Whatever you do, don't buy those cheap breadboard jumpers with "Dupont" male connectors (they're invariably knockoffs) on the end. I currently have an Altair on the bench that was re-wired with...
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    296

    William Colley III's A85 is the closest I've...

    William Colley III's A85 is the closest I've found, Herb has a version with modifications to get it building under modern C compilers:

    http://www.retrotechnology.com/restore/a85.html

    I'm...
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    315

    Reducing voltage on a linear supply *can* result...

    Reducing voltage on a linear supply *can* result in reduced heat from regulators and diodes. Sometimes I turn the line voltage down a little if I'm working with my IMSAI, have very few boards...
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    1,529

    Excellent news, looking forward to it!

    Excellent news, looking forward to it!
  8. Replies
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    315

    Reducing line voltage isn't likely to make a...

    Reducing line voltage isn't likely to make a difference, especially on a PDP-11/03. If something fails at our slightly higher modern levels, it was on the way out anyhow!
  9. So, does the image end up being just a raw...

    So, does the image end up being just a raw filesystem-in-a-file, like when you make a floppy image with dd? If so, can even the larger ones be mounted under Linux?
  10. Cool project, especially nice that it can handle...

    Cool project, especially nice that it can handle much larger floppy images! And, being layer 2, you're not likely to be exposing your machine to any sort of Internet-exploitable vulnerabilities if...
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    98

    I've got a spare Data I/O 29A with UniPak, if...

    I've got a spare Data I/O 29A with UniPak, if that will do the devices you need. Beware, even before shipping, these aren't cheap -- you probably know that if you're looking at Data I/O though.

    If...
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    279

    Update: dead drive may not be dead, I may have...

    Update: dead drive may not be dead, I may have accidentally replaced three bipolar electrolytic caps with polarized ones, waiting on some parts to come in.
  13. Replies
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    z80pack is pretty good: ...

    z80pack is pretty good:

    https://www.autometer.de/unix4fun/z80pack/

    MYZ80 (DOS CP/M compat program) works well under DOSbox (and also real DOS):

    http://www.z80.eu/myz80cpm.html
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    It probably trickle charges the old SLA, which...

    It probably trickle charges the old SLA, which the NiMH cells probably won't like. Most of the better NiMH "trickle charge" circuits are really "maintenance charge" circuits and send pulses of charge...
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    617

    You can't go wrong with Eneloop, but you probably...

    You can't go wrong with Eneloop, but you probably don't want to use the old SLA trickle charge circuit on them.
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    499

    Oh, and don't forget that forced air cooling is...

    Oh, and don't forget that forced air cooling is mandatory! Just a few minutes here and there for testing without cooling would be OK, but if you're going to run it for, say, more than 5 minutes, you...
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    499

    I think you need separate boot ROMs for the...

    I think you need separate boot ROMs for the RQDX3, or you'd have to type in a boot loader every time, I don't think it has them on board. Some third party cards do have boot ROMs built in, like the...
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    617

    If you're going with 4x NiMH cells, you'll be at...

    If you're going with 4x NiMH cells, you'll be at 4.8V and that should be fine. If you're going to add a blocking diode, you can use a Schottky diode with lower forward drop, but with the low current...
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    499

    All of those CPU cards will have ODT in the...

    All of those CPU cards will have ODT in the microcode of the CPU itself, so with a CPU, serial, and console card, you should be able to get to ODT, load in a TU58 bootstrap, and boot from emulated...
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    617

    NEVER BUY RECHARGEABLE BATTERIES ON eBAY! Unless...

    NEVER BUY RECHARGEABLE BATTERIES ON eBAY! Unless you are buying them from a company's designated official eBay store (Tenergy has one). Amazon is often no better. I test every single battery I buy...
  21. He should definitely know about the rev 4 design,...

    He should definitely know about the rev 4 design, being as how that's what he copied for the version he sells. He took the copyright info off but it appears to be the same circuit, just rearranged.
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    SLA will have worse self discharge than modern...

    SLA will have worse self discharge than modern low self-discharge (LSD) NiMH cells, stick with something like Eneloop or Tenergy LSD cells and it'll probably be OK.

    I just use 3.6V 1/2AA...
  23. Texting and driving is supposed to be up there...

    Texting and driving is supposed to be up there with driving drunk. Glad you weren't hurt.
  24. Size is pretty much it. Relevant to some but not...

    Size is pretty much it. Relevant to some but not all of the designs I've personally worked on (obviously a huge issue for phones). But, if I'm going to stock a USB connector and cables, it'll be one...
  25. Heh, not that I'm aware of! I've been...

    Heh, not that I'm aware of! I've been less-than-impressed with even the nicer, more expensive micro USB sockets I've incorporated into projects/products. Certainly nothing like a twistlock! :D
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