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  1. The SD Direct Access mode is documented in this...

    The SD Direct Access mode is documented in this PDF: https://hxc2001.com/download/floppy_drive_emulator/SDCard_HxC_Floppy_Emulator_Direct_Access_mode.pdf

    Hope that helps!

    Edit: sample source in...
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    I deal more with larger transformers, and I don't...

    I deal more with larger transformers, and I don't have my copy of the NEC in front of me, but for larger transformers at least it's allowed to run one at 125% of the continuous rating. That would be...
  3. Thread: NEC V20 and CP/M

    by lowen
    Replies
    48
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    2,620

    Well, the "canonical" MP/M system would have been...

    Well, the "canonical" MP/M system would have been the Altos Sun Series 8000, later called the ACS 8000. With MP/M being available in 1979, and TI's first 4164's in late 1978, machines like the ACS...
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    Hmm, autoincorrect bit me again. My O2 is a 225...

    Hmm, autoincorrect bit me again. My O2 is a 225 MHz; the I2 is a 180.

    IP28 does have 12 slots for RAM, but can only address 1GB in those slots. Older RAM modules in the higher densities threw...
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    I have a purple Indigo2 myself, but not quite...

    I have a purple Indigo2 myself, but not quite that decked out. Mine has a 100mb/s fast ethernet card, HighIMPACT framebuffer, 18GB narrow SCSI drive, the special SGI audio-capable DAT drive (which...
  6. I would personally like the bare board option. ...

    I would personally like the bare board option. Depending on which GAL and EPROM, I can program those myself.
  7. Thread: Vaxen are $$$$

    by lowen
    Replies
    11
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    566

    The specific error in my .signature is from the...

    The specific error in my .signature is from the Tandy TRS-80 Model 16/16B/6000 Xenix system, with the error being written by one Frank Durda IV. Reference:...
  8. Thread: Vaxen are $$$$

    by lowen
    Replies
    11
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    566

    VMS and the follow on OpenVMS are quite secure by...

    VMS and the follow on OpenVMS are quite secure by default, and I would be very surprised to see a VAX/VMS system needing many updates. Search for the string "DEFCON OpenVMS" and read a bit from...
  9. I had a PDP-8 years ago that was used for...

    I had a PDP-8 years ago that was used for controlling a spherical photometer for a manufacturer of lighting systems. Seems a good match to the capabilities to use for machine control.

    PDP-11's...
  10. Wouldn't Alan Cox' Fuzix qualify? There is at...

    Wouldn't Alan Cox' Fuzix qualify? There is at least a stub for a cpu-pdp11 in git.
    https://github.com/EtchedPixels/FUZIX

    But it does seem like most people running old iron seem to want to...
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    Also not yet mentioned are the PC/Elevator cards...

    Also not yet mentioned are the PC/Elevator cards for Apollo DN series workstations with ISA slots and running Domain/OS. They rendered the PC screen in what Apollo called a 'pad.'
  12. Thread: Model 4 BBS

    by lowen
    Replies
    5
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    541

    I ran a Tandy Trader BBS back in the day under...

    I ran a Tandy Trader BBS back in the day under LDOS on a model 4. TTBBS is in the archives of the BBS Documentary as far as I can tell. If you want something really customizable, grab a copy of the...
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    The card you're looking for is the 2Mbps once,...

    The card you're looking for is the 2Mbps once, correct? The one that uses a Z180 MPU? (photo in this eBay listing)
  14. There were a few passive backplane systems that...

    There were a few passive backplane systems that big, but some server boards could be huge, particularly the somewhat rare quad PPro boards.
  15. My first guess would be the amount of cache. A...

    My first guess would be the amount of cache. A 486 at 25 with any cache will be faster than a 486 at 33 without cache. Cross-referencing the IBM FRU off of the processor complex would give you much...
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    Fin combs are meant to straighten from the back...

    Fin combs are meant to straighten from the back to the front, where fins have been pushed in; they're not meant to straighten out a built-in factory zig-zag.
  17. There's more to code speed than CPU clock, even...

    There's more to code speed than CPU clock, even with the same processor installed. Memory speed, wait states, interrupt load, etc can all impact the speed of any given program's run. You'd need to...
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    One of the more useful tools I have for this is a...

    One of the more useful tools I have for this is a fin comb ( https://www.supco.com/web/supco_live/products/FCR6.html is one example). The one I have has a handle with interchangeable combs. Very...
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    Cool. It's an interesting study as to why the...

    Cool. It's an interesting study as to why the VAX9000 did not sell well..... Bob Supnick's take is that the NVAX ate the 9000's lunch, and so, few were sold.
  20. Thread: Real Life Jobs

    by lowen
    Replies
    51
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    4,066

    Well, I've been a broadcast engineer for right at...

    Well, I've been a broadcast engineer for right at 30 years, 10 of those as a full-time Chief operator for a small three-station network. I specialize in directional AM stations.

    I was full-time...
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    The 6000 that I had years ago had the 'turbo'...

    The 6000 that I had years ago had the 'turbo' mod.

    My first system was an upgraded II, much like a 16A but not white and one SS drive.....
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    I have three Proteon 8200 routers of the same...

    I have three Proteon 8200 routers of the same age, with full docs. 68020 processor, ethernet and Pro-net/80 token ring cards, and software on 5.25 floppies. These are Multibus systems, and they are...
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    At my $dayjob it is part of my job description to...

    At my $dayjob it is part of my job description to get obsessive about grounding.... so maybe I do take it to a fault, but it's a big part of what I do day to day for my living.

    I have the...
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    Correct, the current is what kills you...

    Correct, the current is what kills you. Current and voltage are related to each other by Ohm's law:
    E=IR
    Where:
    E is the Electromotive force (aka voltage);
    I is, in André-Marie Ampère's words,...
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    No, actually, it isn't hair-splitting. The term...

    No, actually, it isn't hair-splitting. The term 'earthed' is not defined by the NEC, but, from NEC Article 100:


    The Grounded conductor is bonded to the grounding conductor which is bonded to...
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