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  1. Ok, so when I read the original post just now,...

    Ok, so when I read the original post just now, and the whole thread, I immediately thought of our own forum member gp2000. A few years ago, he worked up a program and content to play the Dr. Who...
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    The 4D will say 4D on the nameplate, and will...

    The 4D will say 4D on the nameplate, and will have double-sided drives with a rotating latch. The 4D keyboard has both the clustered keys AND a backspace key. I likewise have a non gate array model...
  3. Many of these manufacturers changed and adapted...

    Many of these manufacturers changed and adapted as floppies went out; one such company is near me, actually, and started out making the plastic cases for 3.5 inch floppies. As that market dried up,...
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    Either a Z80B rated for 6 or a Z80H rated for 8...

    Either a Z80B rated for 6 or a Z80H rated for 8 should work fine at 4. I don't know about the CMOS versions (Z84C00xx) chips, although you can get those in up to 20MHz ratings. There are some minor...
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    Indeed. TTL "outputs" don't actually output...

    Indeed. TTL "outputs" don't actually output voltage directly.... they sink current that is sourced by the "inputs." NMOS wa designed to be somewhat compatible with TTL, but MOS inputs are not...
  6. Hmm, a VAX named Rosencrantz was the first VMS...

    Hmm, a VAX named Rosencrantz was the first VMS system I had an account on, way back in 1985, at Brevard College in Brevard, NC. It was one of two 11/750's at BC; the other one, used by College...
  7. If Cannon XLR5 is good enough for DMX512, it's...

    If Cannon XLR5 is good enough for DMX512, it's good enough for pretty much anything. Point of sale systems have been known to use XLR4 for RS-485 drops, too.

    But use the improved Neutrik...
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    I read that line and almost spewed my coffee.......

    I read that line and almost spewed my coffee.... TRSDOS 2.3 and 'no issues' in the same sentence.... who'd a thunk it.
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    This is what the MSX Turbo R does in its CHGCPU...

    This is what the MSX Turbo R does in its CHGCPU and GETCPU routines ( see https://www.msx.org/wiki/R800_Programming#BIOS_routines ). This I believe is a pretty good template for a software design to...
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    Well, you might find it educational to look at...

    Well, you might find it educational to look at how the MSX Turbo R did this with a Z80 and an R800. Specifically, https://www.msx.org/wiki/R800_Programming#Deeper_knowledge has some pointers;...
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    Actually, yes. I have one. May not do much...

    Actually, yes. I have one. May not do much good, though, since a specific version of the install floppy is required, and I haven't located that yet, nor have I located the NetSentinel hardware key;...
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    Heh, smail 2.5 here I come! Time to dust off...

    Heh, smail 2.5 here I come! Time to dust off that HoneyDanBer and rev up C-News or Diablo.....we had social networking before that term was even invented..... Dave me a seat in alt.flame and...
  13. If we're going to split hairs here about the...

    If we're going to split hairs here about the meaning of 'band width'.... The bits per inch resolution is higher with RLL (2,7), but the number of potential flux transitions per inch is the same as...
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    The bug is that A is used directly in this...

    The bug is that A is used directly in this manner, not that IRQs are re-enabled..... IMO.
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    Having the IRQ re-enabling EI immediately prior...

    Having the IRQ re-enabling EI immediately prior to RETI was standard practice; EI enables the maskable IRQ after the instruction FOLLOWING the EI; that is, after the RETI. RETI is of course used so...
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    The 4D keyboard (and maybe some later 4GA non-D...

    The 4D keyboard (and maybe some later 4GA non-D keyboards) added the backspace key back to where it had been, but left the PC-style clustered arrow key layout. At least my 4D did.
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    NMI on the Z80 goes to 0066H; IM 1 interrupts go...

    NMI on the Z80 goes to 0066H; IM 1 interrupts go to 0038H. What's interesting about RST 38H is that the hex code is 0FFH.

    I would likewise like to see photos of the unit.
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    So, hello world in Z80 hex, for the TRS-80 Model...

    So, hello world in Z80 hex, for the TRS-80 Model III:


    5200: 210652C31B0248656C6C6F20576F726F
    5210: 64210D00000000000000000000000000


    In assembler (MRAS' format):
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    Computer News 80 did some refurbished Model 4's...

    Computer News 80 did some refurbished Model 4's with both a green screen and clustered PC-style arrow keys, and yet they were non-gate-array models (I have one). The ONLY easily visible external...
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    Poll: CentOS 7 for me. Anything else is in a VM.

    CentOS 7 for me. Anything else is in a VM.
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    If you did indeed get a gate array version (...

    If you did indeed get a gate array version ( RS-232 out the back) then you don't need the PAL U72 to do the 128K upgrade; it's just a jumper change.
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    There was a Mythbusters episode with a segment on...

    There was a Mythbusters episode with a segment on high-speed CD drives....

    https://en.m.wikipedia.org/wiki/MythBusters_(2003_season)#Episode_2_%E2%80%93_%22Cell_Phone_Destroys_Gas_Station%22
    ...
  23. ST4096 has 9 heads.

    ST4096 has 9 heads.
  24. First, I want to clarify something: this would...

    First, I want to clarify something: this would not have been possible without the concerted effort of the group that traveled to Fort Worth, put down money, hauled the stuff, and did the imaging work...
  25. Frank Durda's SCSI Host Adapter Schematic found.

    All, here is the schematic to Frank Durda IV's SCSI host adapter for the Model III/4/4P expansion bus. This design says right on it that it's AS-IS and licensed for non-commercial educational use...
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