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Type: Posts; User: Chuck(G)

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  1. Replies
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    Al, have you dropped a line to this guy...

    Al, have you dropped a line to this guy? He claims to have done the extensions for the Mindset at Microsoft.
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    That pretty much agrees with my...

    That pretty much agrees with my suspicion--Weltec, back in the day (ca. 1986) offered a rather unsuccessful drive that allowed the use of 1.2MB floppies on a stock PC-XT by switching the spindle...
  3. There are some nice photos here...

    There are some nice photos here ICON 2 and 3

    Anyone collect the older UNISCOPE terminals?
  4. Perhaps not a typo (which indicates an unwitting...

    Perhaps not a typo (which indicates an unwitting error). Could also be clickbait. Anyone for SP7? :)
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    I don't partake in PS/2 stuff, but this has a...

    I don't partake in PS/2 stuff, but this has a familiar ring to it. Could it be that the controller firmware or BIOS uses 6-byte CDBs exclusively? I've seen that this is the case for older SCSI...
  6. I'm very interested in this. I'm aware that an...

    I'm very interested in this. I'm aware that an 8086 could be replaced by a NEC V30 (70116) CPU for the same end, but I've never heard of a copro chip to provide extended 286 instruction support.
  7. Well, I suspect that SP5 includes a rollup of...

    Well, I suspect that SP5 includes a rollup of various KB patches; if you install the old "unofficial SP4" and then update, there is perhaps more than 100 KB updates to go, particularly if you're...
  8. Well, if you dig into some of the publications of...

    Well, if you dig into some of the publications of that time (e.g. PC Week), kits were being offered to kick the speed of the 5170 up. They were mostly assortments of crystals--just pick the fastest...
  9. There have been updates to the unofficial SP4,...

    There have been updates to the unofficial SP4, since 2014.
  10. If you changed the crystal, sure (and assuming...

    If you changed the crystal, sure (and assuming that you didn't have the IBM BIOS that prevented it). But why? The die is almost certainly just a licensed copy by IBM of the Intel original, given...
  11. Used on the 5170 512K motherboard 6480148-XM. ...

    Used on the 5170 512K motherboard 6480148-XM. Here's one

    Probably fairly late in the 5170 production; CPU is almost certainly an 8Mhz model.
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    Sure, I've got a couple of free VoIP lines from...

    Sure, I've got a couple of free VoIP lines from Google voice, as well as my regular VoIP service, all going though VDSL.

    I keep my cell phone for the times when the power goes out. Not even old...
  13. Perhaps the disclaimer on the CC II applies to...

    Perhaps the disclaimer on the CC II applies to some specific revision; revision "D" uses a UMC8326 data separator, which will definitely handle FM--that 8 pin DIP on the left side, just below the...
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    Other things that will cause the spindle motor to...

    Other things that will cause the spindle motor to shut down without restarting include a bad servo track on drives that use that positioning technology. The drive is then essentially trash, as...
  15. I'll toss my knowledge in here. Compaticards...

    I'll toss my knowledge in here.

    Compaticards can be grouped into two broad categories; the I and II; and then the IV. They are very different internally.

    The I and II are essentially the same...
  16. Thread: Ebay 'offer'

    by Chuck(G)
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    When this sort of thing comes up, some sellers...

    When this sort of thing comes up, some sellers create a listing with a very high BIN and accept whatever offer that has been previously agreed upon.

    But it depends on the item and the nature of...
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    Sounds as if the drive couldn't maintain the...

    Sounds as if the drive couldn't maintain the speed desired and so shut down. Dry-ish bearings, perhaps? Not unknown on ST-225s.
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    Well, I think that silver-oxide ones are still...

    Well, I think that silver-oxide ones are still made, but really, plain old alkalines do just fine. I'm not sure that lithiums would give you any additional life.
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    I suspect that the SWTPC uses a 15.7KHz...

    I suspect that the SWTPC uses a 15.7KHz horizontal 60 Hz veritcal scanning rate; the 5151 is 18KHz 50 Hz, so no, not quite right. It might work, given that the 5151 lacks a horizontal oscillator per...
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    The use of a NiMH or NiCd battery in this...

    The use of a NiMH or NiCd battery in this application has always confused me. The CMOS RTC draws but 50 microamps or so in quiescent mode. On the other hand, an NiMH or NiCd battery...
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    Mobile coverage is still crap out here--I get 3G...

    Mobile coverage is still crap out here--I get 3G and one bar.
    PagePlus does it for me--I get a phone that I can at least make calls with for $10/month. Forget apps and web browsing.
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    Almost every manufacturer of an MPU offered a...

    Almost every manufacturer of an MPU offered a development system. This extends to AMD, National Semi, General Instruments, TI, etc. That's why I'm a bit nonplussed about the Mostek one.
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    What makes this system special? Is it any more...

    What makes this system special? Is it any more so than, say, an Intel MDS or Zilog MCZ?
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    That's because the external battery jumper isn't...

    That's because the external battery jumper isn't intended for rechargeable batteries, but for primary batteries. Just get a 3x or 4x AA or AAA battery holder and some alkaline cells. You'll be...
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    ...and of course, I published actual source code...

    ...and of course, I published actual source code for communicating with the BP floppy device. But the links were scrambled in the vintage-computer-to-vcfed changeover. And I can't go back and edit...
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