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Thread: Compaq Portable I Lo-Tech ISA XT CF adapter boot issues

  1. #11
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    A couple more grasps at straws then - you say with the XT CF card in it will only power up once after being powered down for an extended amount of time. About how long is that? If we are talking perhaps 5 minutes or more, perhaps try removing the other ISA cards from the system (within this extended amount of time) and see if it powers up.

    What about with the floppy drive unplugged? I don't recall there is anything else that is easily disconnectible.

    When it does power up with the XT CF, does anything seem to get hot? Does the machine actually stay on for an indefinite amount of time until power cycled?

    Do you have any other random ISA cards you can plug in? (Perhaps borrowed from the other Compaq? Anything that conflicts and prevents booting is fine as long as you can see it is powering up or not)

    With the XT CF plugged in and the machine powered down, perhaps check with a volt meter for stray voltages. Might be worth checking the power voltages while powered on (with or without the XT CF card) to see if they are close to normal.

    Any issues with your power outlets? (Properly grounded, not backwards, using a good bar strip, nothing else sucking power on that circuit?)

  2. #12
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    Quote Originally Posted by acenewman View Post
    works only when the slot 8 jumper is set for slot 8 use. when not set for slot 8 it gives a disk access error message. still has the issue with tripping the supply if the slot 8 jumper is used.
    I don't see this covered in previously in the thread, but: When you configure it *not* for slot 8 use, have you tried every single slot in your system, shuffling around the graphics card to accommodate?

    Most of the time the motherboard power light lights briefly and then goes out. If I power cycle it it will continue to light only briefly.
    Have you used a multimeter to check the power coming from the PSU? Are the voltages and current within spec?
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  3. #13

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    quick update. I have done a little experimenting and it seems that as long as I give it 1.5-2 min after power down it boots right back up every time. It will do a hot reset with out any issues.

    Now that I have gotten some software onto the CF card and started using it it's not the huge inconvenience I initially thought it would be.

    I did do a little experimenting, unplugging one or both floppy drives and trying different slots with the slot 8 jumper set and not and none of it made a difference.

    Still struggle with the whole weak power supply theory as it behaves the same in both machines. Plus the machine has no issues when I fill all of the expansion slots with cards. One of them being a memory expansion.

    Time to go play around in Lotus123 and WordPerfect. I want to test a Victor 6020 printer I picked up recently.

    Thanks for all the suggestions, Chris

  4. #14
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    You wrote previously "I have tested the CF card in my 5170 and it boots up fine with no issues." but then just now you wrote "Still struggle with the whole weak power supply theory as it behaves the same in both machines." Hard to offer troubleshooting advice when we're getting mixed messages...
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  5. #15

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    sorry if I was not clear with my previous post. I tried the adapter and CF card in both of my Compaq Portables with the same results.

    When I mentioned trying the CF card in my 5170 I meant only the CF card itself. Just to verify that there were no issues with the CF card or the DOS install on it. I did not try the card adapter in the 5170. I have a completely different CF card reader setup in the 5170. Again, sorry for any confusion. Chris

  6. #16
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    Very strange that it doesn't work without the slot 8 option selected. The compaq doesn't have the slot 8 card select signal requirement that the IBM XT has for slot 8 only. Do you have the optional SMD components on the back side of the card? Have you tried to contact the creator of the XT-CF? He is a member here pearce_jj but I don't think he's been active this year.

  7. #17

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    Quote Originally Posted by acenewman View Post
    ...... I did not try the card adapter in the 5170. I have a completely different CF card reader setup in the 5170......
    Can you try the lo-tech ISA - CF adapter in your 5170 ? or another AT PC with ISA slots, Setting Hard drives to "None" in the system BIOS setup. and see if it still gives the same issues ?,

  8. #18

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    Yes it does have the SMD components on the back.

  9. #19

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    I have to pull the AT out to look at some issues with the serial card soon. Will try the card in it as well. Wont be tomorrow, but probably in the next week or so.

  10. #20
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    The 5170 and 5162 (IBM AT and XT-286) can't use XT-IDE cards as there is an incompatibility with the XUB and the BIOS on those systems. The only way the XUB works on them is if the BIOS is replaced with one from AMD. So the 5170 and 5162 are not good systems to test XT-IDE cards in.
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