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Type: Posts; User: Chuck(G)

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  1. IBM IR keyboard for $3 on Goldmine-electronics.

    $3 NOS in box

    Negotiate shipping with them and it's a real deal.

    Note that I did a github project using a Blue Pill and a simple 3-terminal IR receiver to produce PS/2 keyboard output with one...
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    Of course, you mean x86 processors, right?

    Of course, you mean x86 processors, right?
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    ALTINST is implemented in NASM, but that's as far...

    ALTINST is implemented in NASM, but that's as far as it goes. Here's the link to the original Domas paper. Not terribly helpful if you're looking for specific instruction descriptions, however.
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    Does this help? It's pretty recent....

    Does this help? It's pretty recent.
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    Look up the thread a few postings. I believe I...

    Look up the thread a few postings. I believe I posted something to this effect.
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    I'd always understood the C3 to be a VLIW core...

    I'd always understood the C3 to be a VLIW core design. Is this not true?
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    I didn't say that the drive selects weren't the...

    I didn't say that the drive selects weren't the second (DS1 or DS2, depending on the manufacturer's naming) drive in the chain. After all, all the DSx pins wind up in the same place, right? The...
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    I've seen words about the C3+ chips having an...

    I've seen words about the C3+ chips having an alternate instruction set. Looks interesting, but never had the urge to test it out.

    AIS info
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    Someone must think they're worth something....

    Someone must think they're worth something.

    Note that this one has 14 300GB drives installed.
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    Take a look at the maintenance manual...

    Take a look at the maintenance manual, page 6-29. Note that the upper head assembly uses a felt pad. I can't tell with the drive you've shown.
  11. Thread: DOS mysteries

    by Chuck(G)
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    That's true--there was no standard to DOS 1.x...

    That's true--there was no standard to DOS 1.x disks wrt boot sector data. Originally, you read the second sector and looked at the FAT ID byte and worked from there.

    But then, FAT ID F9h kind of...
  12. Thread: DOS mysteries

    by Chuck(G)
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    737

    But such disks were not bootable, obviously. ...

    But such disks were not bootable, obviously.

    Back in the old 1.x and 2.0 days, we wrote our own IO.SYS, so the check probably wasn't there.
  13. Thread: DOS mysteries

    by Chuck(G)
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    737

    How about the DEC Rainbow? Here's the first few...

    How about the DEC Rainbow? Here's the first few bytes of their MSDOS boot disk. Note that the Rainbow-100 starts off in Z80 mode.


    00000000 f3 1e 00 31 00 11 db 40 e6 03 32 fa 0f 3e 02 32 ...
  14. Thread: DOS mysteries

    by Chuck(G)
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    You're assuming that the boot code is standard. ...

    You're assuming that the boot code is standard. That's a big assumption--my own format utility didn't use the standard MS/IBM code. In 1985, the bulk of PCs out in the world were still 8088; it...
  15. Thread: DOS mysteries

    by Chuck(G)
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    You miss the point--and on the 8088, 69h is the...

    You miss the point--and on the 8088, 69h is the same as 79h (try it yourself, though it's been documented). or JNS. On the 80186 and above, it's IMUL.

    The point is to have something that will...
  16. Thread: DOS mysteries

    by Chuck(G)
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    While it's not likely that it will ever happen,...

    While it's not likely that it will ever happen, it's also why I'm interested in a 69h floppy sample. The next two bytes would tell the story of what would happen if a boot were attempted.

    If it...
  17. Anything that I can do to make things more...

    Anything that I can do to make things more cromulent. :)
  18. Thread: DOS mysteries

    by Chuck(G)
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    You'd have to ask the person who coded that and...

    You'd have to ask the person who coded that and the code review people.

    But it was harmless (i.e. there were no unexpected negative side effects) and useful for testing; the disk still has to pass...
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    It's been discussed before; before the debut of...

    It's been discussed before; before the debut of the 5150, the rumor mill was thick with rumors about a "new" IBM PC using the 68K. Indeed the Lab computer uses one.

    The problem is that, in 1981,...
  20. Thread: W95 Woes

    by Chuck(G)
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    NDIS belongs to the network interface. ...

    NDIS belongs to the network interface.

    Personally, I'd stick with 98SE and look for drivers. They're certainly out there.
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    Not only that, but the earlier photos clearly...

    Not only that, but the earlier photos clearly show that the upper head is MIA.
  22. Thread: DOS mysteries

    by Chuck(G)
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    I suspect that this was intended to prevent...

    I suspect that this was intended to prevent accidental booting--during testing, looking away while some bit of code accidentally or intentionally does an INT 19h could lead to disaster. Probably...
  23. Thread: DOS mysteries

    by Chuck(G)
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    OS2museum says they've got the OAK for DOS 3.21...

    OS2museum says they've got the OAK for DOS 3.21 (DOS-in-ROM support). I'm not tight with those folks, but perhaps someone could ask them for the relevant code.

    But thinking about the problem...
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    In my meager experience, I've found that, by and...

    In my meager experience, I've found that, by and large, perceived errors in alignment are mostly due to the track 0 sensor being contaminated by dirt. In almost all drives, this is an optical...
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    No, obviously you'd never visited the IBM PCC...

    No, obviously you'd never visited the IBM PCC BBS, but other divisions used our diskette self-extractor for both DOS and OS/2. The Teleget thing was special; it was required, but I don't recall the...
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