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    Yeah, DOSMAX 2.1. Here's a copy of my config...

    Yeah, DOSMAX 2.1. Here's a copy of my config file. (Slightly cleaned up, I removed some commented-out things like a redundant SHELLMAX command.) Almost the same config works on 5 and 6.22. (With the...
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    With DOSMAX's help you can load MS-DOS 5 through...

    With DOSMAX's help you can load MS-DOS 5 through PC-DOS 7's kernels into a UMB and free up the equivalent amount of space as you get from loading them into the HMA. Essentially DOSMAX fakes out the...
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    FWIW, "The Last Byte" does work on DOS 3.3 with...

    FWIW, "The Last Byte" does work on DOS 3.3 with static upper memory blocks. Running the "chipset" auto-detect program automatically sniffed out the 96k of memory type PHYSICAL in the right place, and...
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    Here's the "advanced" pack: ...

    Here's the "advanced" pack:

    http://files.mpoli.fi/unpacked/software/dos/utils/misc/tlb_a252.zip/

    I have a DOS 3.3 boot partition on my Tandy, I suppose I could probably see if it does anything...
  5. For the aforementioned reasons I'll assume this...

    For the aforementioned reasons I'll assume this was a joke. ;)

    Just to be clear, I didn't mean to encourage you to trash the machine, there certainly are tasks out there it's capable of, and if...
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    I'm not actually sure the distinction matters...

    I'm not actually sure the distinction matters here. Both can serve as a static memory register, which is what the '273 is doing here. (Although I did technically say the wrong thing, I'll certainly...
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    I'm pretty sure Tandy used a bog-standard NEC 765...

    I'm pretty sure Tandy used a bog-standard NEC 765 up through at least the start of the TL series, so it shouldn't be too hard to find a replacement, if that's the problem. The drive select and...
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    A QRAM "FAQ"/technical document from Quarterdeck...

    A QRAM "FAQ"/technical document from Quarterdeck that also seems to confirm it doesn't probe for nor use statically mapped upper memory, you *have* to have some kind of memory mapping unit:
    ...
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    Here's the manual I was going off of: ...

    Here's the manual I was going off of:

    ftp://computermuseum.informatik.uni-stuttgart.de/misc/Quarterdeck_qram.pdf

    I couldn't find anything about forcing it to use some particular shadow memory...
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    I tried it, the "RAM" parameter still involves...

    I tried it, the "RAM" parameter still involves backfilling from EMS. (The manual is kind of confusing about the distinction between RAM and INCLUDE but, trust me, neither work. Unless someone can...
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    Except, as noted, from what I can tell you can’t...

    Except, as noted, from what I can tell you can’t use QRAM with a UMB that’s not created with either EMS or 286 shadow memory. If you know the secret syntax to have it use “hardwired” memory I’m happy...
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    Heh. It's certainly an interesting puzzle. I'm...

    Heh. It's certainly an interesting puzzle. I'm learning just enough about DOS internals to be even more intimidated by it.

    My wild guess is the reason those programs like VIDRAM are walking the...
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    Totally ignorant thought about the disappearing...

    Totally ignorant thought about the disappearing UMB link... found this link about DOS memory management functions:

    https://dos4gw.org/Memory_Management_Functions

    Could those functions...
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    The "UMB Disappearing" thing happens if you have...

    The "UMB Disappearing" thing happens if you have a Tandy 1000(*) with upper memory blocks and run a TGA program that uses more than 16K of memory so, yeah, apparently the crudest possible "hit it...
  15. I can attest that the C7 is a dog. Made the...

    I can attest that the C7 is a dog. Made the mistake of getting one of these HP-2133 Mini-Notes back in the day; it's a physically beautiful piece of hardware, but I think it may perform worse than a...
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    I wish I knew enough about the Model 16 family to...

    I wish I knew enough about the Model 16 family to actually comment intelligently on this thread, but here's some blather anyway.

    I've been sort of curious for a while what the "MMU" in the Tandy...
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    I've been eyeballing this myself, and to expand...

    I've been eyeballing this myself, and to expand on this here's my thoughts:

    1: Don't have both drives hooked up at once, let's try one at a time. Work up from there.

    2: I concur that those...
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    Seems like the Z8 was pretty popular for time...

    Seems like the Z8 was pretty popular for time critical bit-shuffling stuff too. It showed up on at least a few hard disks...
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    Huh. Looking at an ISA reference it says "Devices...

    Huh. Looking at an ISA reference it says "Devices using this signal to insert wait states should drive it low immediately after detecting a valid address decode and an active read or write command"....
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    USE!UMB.SYS takes 192 bytes of conventional RAM,...

    USE!UMB.SYS takes 192 bytes of conventional RAM, according to "mem /c", although I think you also need DOSMAX stacked on top to enable the LOADHIGH/DEVICEHIGH commands? "mem /c" pegs the usage for...
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    Interesting. So, yeah, I guess those DOSes just...

    Interesting. So, yeah, I guess those DOSes just hate 704k.com.

    PC-DOS 2000 does work with VIDRAM.COM and friends, which apparently do "something else" to move the top of memory instead of that...
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    I’m still wondering about the “full operating...

    I’m still wondering about the “full operating mode” thing. If that is actually the problem I wonder if the DOSes that “work” might crash if you overwrite that area.
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    If the light comes on and the motor spins...

    If the light comes on and the motor spins endlessly as soon as itís powered on thatís the classic sign of the floppy connector being plugged in backwards. Iím a veteran of having done that more than...
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    If you just need to stuff a value in a register...

    If you just need to stuff a value in a register maybe the code framework I used for my EMS2UMB enabler shim would interest you. Lets you make an .EXE that you can run either from a command prompt or...
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    I think that LDOS ad speaks for itself. GO FOR...

    I think that LDOS ad speaks for itself. GO FOR IT! :winkingdevil:

    (I totally would, seriously, but then I already own one pitchfork-worthy Tandy-trocity. Just make sure you use a real, proper,...
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