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Type: Posts; User: Chuck(G)

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  1. Replies
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    The P4 board in question is 865GV-based and uses...

    The P4 board in question is 865GV-based and uses an ITE8888 PCI-to-ISA bridge. Doesn't work worth spit. Nice motherboard, too - Advantech AIMB-742.
    Same picture for my P3 I820 chipset board with...
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    I've got a couple of AM3+ quad cores, the same...

    I've got a couple of AM3+ quad cores, the same situation--have both legacy floppy and IDE as well as SATA.

    Sadly, the latest ISA-equipped board I have is a P4--and ISA DMA doesn't work.
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    That's strange. I have EBCDIC character...

    That's strange. I have EBCDIC character generator ROMs from the early-mid 70s. They weren't rare--and given that this thing was circa 1979, "rolling your own" from a 2716 was a very practical...
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    EBCDICASCII perhaps? But what of the third...

    EBCDIC<->ASCII perhaps? But what of the third 1702?
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    Good point, Dwight. I was a little murky on that...

    Good point, Dwight. I was a little murky on that one also.

    Unless and until we can actually see how at least one 1702A is connected to the surrounding circuitry, I'm really suspicious about their...
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    For the time, it makes sense. Go a few more...

    For the time, it makes sense. Go a few more years toward, say, 1989 and 3.5" drives and drawers were common. But not in 1986.
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    Is there continuity between the PSU ground/common...

    Is there continuity between the PSU ground/common and the heat sink? If so, you have your answer.
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    If you're talking about 1.44M 3.5" drives, none...

    If you're talking about 1.44M 3.5" drives, none that I'm aware of; not even the earliest.
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    They were actually more common than you'd think. ...

    They were actually more common than you'd think. One reason is for data security (remember, this is pre-Internet). At the end of the day, you pull the drive and stick it in the company safe. ...
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    Depends on the vintage. I have some NEC HH...

    Depends on the vintage. I have some NEC HH units that require 12v; some older Sony drives do as well. Haven't checked, but I suspect my 3.25" drives do as well--they're old enough.

    Card edge...
  11. I would have supposed that MOS Technology's own...

    I would have supposed that MOS Technology's own cross-assembler would be the standard.

    http://retro.hansotten.nl/uploads/6502docs/CrossAssemblerMOSmanual.pdf
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    Yes, you can leave the batteries in, as they...

    Yes, you can leave the batteries in, as they supply a bias current; they don't actually take any part in operation and the current draw is in microamperes.

    Are you old enough to remember "C" bias...
  13. Yup, still have a bunch of the parallel ones. ...

    Yup, still have a bunch of the parallel ones. Of course, if you're talking to a "modern" computer, that parallel port may be a myth.
  14. Serial laplink running at 115K isn't awfully much...

    Serial laplink running at 115K isn't awfully much slower than the parallel variety--and it's often the most reliable. No fiddling with EPP, ECP, etc.
  15. A serial laplink cable is little more than 3...

    A serial laplink cable is little more than 3 wires and some jumpering on the back of each connector.

    Parallel "nibble mode" cables are only a little more complicated.
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    There is--the Vbb needs are very low...

    There is--the Vbb needs are very low current--it's basically a substrate bias. A resistor and a zener off of any of the -V supplies should have done it nicely, though there is a power sequencing...
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    First order of business, electrolytics. Then...

    First order of business, electrolytics.
    Then tantalums, if they're failing.
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    Well, they might be used in sequencers also. ...

    Well, they might be used in sequencers also. But I can't figure out why they're needed.
  19. Yeah, well, that's the reason that all of my...

    Yeah, well, that's the reason that all of my systems are multiple-boot. Win7 has terrible QIC80 support as well...
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    I wonder if this was a game for the 5150...

    I wonder if this was a game for the 5150 (cassette input).
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    The 14.3818 crystal is there to provide a...

    The 14.3818 crystal is there to provide a spec-required signal on the ISA bus--and also quite likely to clock the 8254 counter-timer. You don't want to fool with that.
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    Start by powering up the supply without a load. ...

    Start by powering up the supply without a load. It's a linear one and so should sit up and work. The big electrolytic is 50-50 probable dry.

    If you connect up the thing, make sure to add two...
  23. That tells something. The error has nothing to...

    That tells something. The error has nothing to do with DMA. The code is timing out waiting for an interrupt. I suspect it's the way the 8259 is set
    up, but that's just a hunch. I don't have...
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    No microprocessor here, for certain. We see a...

    No microprocessor here, for certain. We see a Moto 8K character generator ROM, which requires a Vbb of -3V; hence the battery holder.

    The 1702s are a mystery. Why anyone would be using them...
  25. Another possibility--a parallel port network...

    Another possibility--a parallel port network adapter.
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