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  1. Replies
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    I've got a few HP (Neoware) thin clients that are...

    I've got a few HP (Neoware) thin clients that are useful for minor things. I ran a C7-equipped CA21 for years as an email server under Linux; I use a CA19 C3-equipped one to drive an EPROM...
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    Were there any third party hardware vendors for...

    Were there any third party hardware vendors for the JX?
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    No comments about the "no guts in here" VIA CPUs?

    No comments about the "no guts in here" VIA CPUs?
  4. Thread: DOS mysteries

    by Chuck(G)
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    I suspect that (4) may be the most fruitful.

    I suspect that (4) may be the most fruitful.
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    Actually, a well-implemented P4 design isn't too...

    Actually, a well-implemented P4 design isn't too bad for 32-bit hardware. A Gallatin 3GHz for the time, IIRC, turned in pretty good numbers for Socket 478 CPU. I still use on in one of my systems. ...
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    Those are the good ones--the 16Mhz bad ones don't...

    Those are the good ones--the 16Mhz bad ones don't have the double-sigma.
  7. Thread: DOS mysteries

    by Chuck(G)
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    I want to see the 69h floppies to see what...

    I want to see the 69h floppies to see what follows that magic byte...
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    What about the 386s (pre double-sigma) with the...

    What about the 386s (pre double-sigma) with the floating point bug?
  9. Depends on the platform, but the most...

    Depends on the platform, but the most straighforward way, IMOHO, is to hook Interrupt 1ch This is a dummy routine called by the INT 8 servicer and normally contains only an IRET instruction.

    Why...
  10. Thread: DOS mysteries

    by Chuck(G)
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    So, for me, here's the $2⁶ question: Does any...

    So, for me, here's the $2⁶ question: Does any one have or has anyone seen one of these mysterious 69h floppies? I certainly haven't.

    If one crops up, I'd like to see the boot sector.
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    Answer of why IBM teleget: As best as I can...

    Answer of why IBM teleget: As best as I can recall, it was because IBM had a few disks that didn't conform to standard 512-byte sector layout; i.e. there were intentional quirks in it. It was...
  12. Thread: 8085 vs 80c85

    by Chuck(G)
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    The undocumented instructions are the same in...

    The undocumented instructions are the same in both. Intel originally distributed the information about the added instructions as an internal company memo. But they're there even in the i8085...
  13. Thread: Adding NOPs

    by Chuck(G)
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    Tinkering with a practical problem is a wonderful...

    Tinkering with a practical problem is a wonderful way to learn how a machine works. By the time you have things solved to your satisfaction, you've accumulated a whole pile of understanding--and...
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    Please, it's Sydex. Sybex published real books...

    Please, it's Sydex. Sybex published real books on paper.

    Long time ago, but my recollection is that Tulip and a few other vendors wanted to distribute image files and wanted to keep them unique...
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    Odd that it's not availble in England, but I can...

    Odd that it's not availble in England, but I can still order the stuff through my big-box office supply store here. I even have a nearly-full box of the stuff here.
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    It's not an EMS card, but rather a standard...

    It's not an EMS card, but rather a standard memory card, as an earlier poster has already mentioned. No drivers needed. Without seeing the reverse side however, we don't know if this takes 64Kb...
  17. Thread: Adding NOPs

    by Chuck(G)
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    You can double your note storage by packing more...

    You can double your note storage by packing more information per byte. Way back when (what, 45 years ago/) when I did the code for my Altair, I thought about things this way and keyed it all in via...
  18. Thread: DOS mysteries

    by Chuck(G)
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    No, the system in question would have to write...

    No, the system in question would have to write FAT12-format floppies routinely. So none of the non-Intel *nix would apply. Perhaps the iAPX 432, which, in 1981 was a hot topic? I've never seen a...
  19. Thread: DOS mysteries

    by Chuck(G)
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    Were there any non-x86 architectures that wrote...

    Were there any non-x86 architectures that wrote DOS-format floppies? (I already checked 68K (GEM))
  20. Thread: DOS mysteries

    by Chuck(G)
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    Anent PSP:50h, probably a dead-end development. ...

    Anent PSP:50h, probably a dead-end development. It would be interesting to see the internal PCDOS 2.0 design documents.

    Discussion on the 69h thing here

    As noted, the comment in MSDISK doesn't...
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    Yeah, I think you'd better qualify the title on...

    Yeah, I think you'd better qualify the title on the other thread--there's Amiga DOS....
  22. Thread: DOS mysteries

    by Chuck(G)
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    That doesn't mean anything, in my opinion. The...

    That doesn't mean anything, in my opinion. The DOS code is littered with kludges that deal with prior errors.
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    IBM's use of "DOS" marked a sea-change in...

    IBM's use of "DOS" marked a sea-change in thinking at IBM, I think. Before this, IBM systems, if capable, usually had something called "Monitor" (e.g. Monitor II-D, FMS, etc.). Univac claimed...
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    But, at the time, PC98 (or NEC PC) had 70% of the...

    But, at the time, PC98 (or NEC PC) had 70% of the market in Japan. Penetration would have been costly and difficult.

    Contrast the NEC APC--came out at about the same time as the 5150. Superior...
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    How can you tell what the tip temperature is on...

    How can you tell what the tip temperature is on the Chinese cheapie?

    Personally, I have reservations about having full line voltage on a metal-tipped tool cheaply made in China.

    But maybe I'm...
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