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  1. Why do you want to stay away from cracks? You...

    Why do you want to stay away from cracks? You can prove ownership, so under the DMCA you're legally allowed to circumvent any copy-protection measures to get the programs working.
  2. The AT&T PC 6300 (a rebadged Olivetti M24)...

    The AT&T PC 6300 (a rebadged Olivetti M24) published their source in their service manual.
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    Right off the bat, don't use FreeDOS unless you...

    Right off the bat, don't use FreeDOS unless you are 100% positive the distro you're using works on 808x systems. Most FreeDOS distros do not, so just stick to MS-DOS for your testing.
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    These were interesting, oddball cards. Rather...

    These were interesting, oddball cards. Rather than offer something more recognizable like 640x400, the early boards offered 512x480 resolution in 256 colors. If your card had more memory, it could...
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    I do, but I'm swamped until about 1-2 weeks after...

    I do, but I'm swamped until about 1-2 weeks after VCFMW is over.
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    A good theory, however the PCjr's slowdown at...

    A good theory, however the PCjr's slowdown at very high interrupt rates (16 KHz) is much worse than on a Tandy 1000. So the Tandy 1000 is slower, but only by 1%, just enough to be audible. On an...
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    Not to derail the conversation too much, but I'm...

    Not to derail the conversation too much, but I'm publishing a video this weekend that proves the Tandy 1000 (the original) can be just a hair slower than the IBM PC, found when doing a...
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    My recollection of the eduquest mwave's sound...

    My recollection of the eduquest mwave's sound blaster emulation is that it is not very good and not very compatible.
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    Love the conclusions, thanks to Eudimorphodon and...

    Love the conclusions, thanks to Eudimorphodon and eeguru for clarification!
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    There are no ISA cards that can add a PS/2...

    There are no ISA cards that can add a PS/2 keyboard.

    Wouldn't it be much faster and easier to just get a Tandy keyboard?
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    Your stated goals conflict with the whole point...

    Your stated goals conflict with the whole point of writing an opcode exerciser (to be as accurate as possible). Why not just fork DOSBOX and be done?
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    Sandsifter requires a 386+ because it relies on...

    Sandsifter requires a 386+ because it relies on invalid opcode exceptions (and while 286 has those, sandsifter is written in python so it still needs a 386-class system to run on). So you can't run...
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    An x86 validation test would be extensive since...

    An x86 validation test would be extensive since the behavior of the x86 line changed with every CPU. It is more practical, IMO, to pick a single CPU and concentrate on just that until all of the...
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    The search space can be reduced considerably by...

    The search space can be reduced considerably by using bit patterns commonly used for memory testing: 55h, CCh, 00h, 01h, FEh, both by themselves as well as rotated 0-15 times as appropriate (ie....
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    We disagree on what "rather general math...

    We disagree on what "rather general math calculations" means.
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    You don't have to ask :-) but getting the "best"...

    You don't have to ask :-) but getting the "best" price for each of them may involve a combination of private sales, ebay, and amibay.

    I'm sitting on a lot of valuable hardware, but I have this...
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    Sadly, Heritage Auctions is getting in on this...

    Sadly, Heritage Auctions is getting in on this with console games and it's leaking over into software collectibles.



    Strike while the iron is hot.
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    BUFFERS in CONFIG.SYS defines the number of...

    BUFFERS in CONFIG.SYS defines the number of 512-byte buffers to be used as a read cache. When DOS loads data, it does so in two ways:


    If the user-provided destination is paragraph-aligned and...
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    This is likely. It's happening in the software...

    This is likely. It's happening in the software collectibles market too; a loose official Wolfenstein 3-D disk (registered, contained all 6 episodes) sold recently for about $1000 US. If you were a...
  20. If the BIOS uses software loops for timing...

    If the BIOS uses software loops for timing hardware events, a faster CPU will disrupt them. Is there a BIOS listing for the Amstrad PC1640?
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    Tony and Friends uses 320x400 and 320x480, not...

    Tony and Friends uses 320x400 and 320x480, not 400x300.

    400x300 needed a very good multisync monitor so I'm pretty sure that specific mode was never used; I didn't even get it to work consistently...
  22. Without the compiler package, can programs...

    Without the compiler package, can programs written in the system be distributed without the entire UCSD environment?
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    Thanks for the update, and welcome to the...

    Thanks for the update, and welcome to the wonderful world if IBM PC vintage computing :-)
  24. This sounds like the way to go, although I can't...

    This sounds like the way to go, although I can't help with a parts list, sorry. Also, you may not be able to reduce the interference noise 100%. The original Tandy 1000 has very low/no interference...
  25. Search this forum for posts by "carlostex" who...

    Search this forum for posts by "carlostex" who has done much of this work and posted about it.
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