1. Forum
  2. Usenet
  3. COMP.SYS.HP48

  • 48GX card contacts cause resets?

    From jibanes@21:1/5 to All on Tue Feb 19 04:43:49 2019
    Seems that my trusty 48GX's 2MB extension card causes resets; wiping all memory in the process. My guess is that, with time (~25 years?) the contacts between the 48gx and cards became rusty, causing the resets; but I can't confirm that.

    Other than migrating to the 50, which options are available?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Bruce Horrocks@21:1/5 to jibanes on Tue Feb 26 18:42:51 2019
    On 19/02/2019 12:43, jibanes wrote:
    Seems that my trusty 48GX's 2MB extension card causes resets; wiping all memory in the process. My guess is that, with time (~25 years?) the contacts between the 48gx and cards became rusty, causing the resets; but I can't confirm that.

    Other than migrating to the 50, which options are available?


    I take it you have checked the coin cell battery in the card?

    It could be the contacts but since the card stays in place most of the
    time (I assume that's what you do) then it's unlikely. More likely
    whatever form of RAM it has in the card is breaking down.

    It could be the 48 though!

    --
    Bruce Horrocks
    Surrey
    England
    (bruce at scorecrow dot com)

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Neon John@21:1/5 to All on Fri Mar 15 13:31:45 2019
    On Tue, 19 Feb 2019 04:43:49 -0800 (PST), jibanes <jibanes@gmail.com>
    wrote:


    Other than migrating to the 50, which options are available?

    I strongly urge you to get a 50 if you still can. I was and am a
    hard-core HP-41 guy. I had all the HP-IL peripherals including the
    tape drive and voltmeter. Gradually things started going bad. The
    pinch roller in the tape drive was the first to go. Then the
    voltmeter started producing squirrly readings. Then the card reader.
    I nursed the calculator itself until the 48 series came out. I bought
    one and HATED it. It's like RPL was an afterthought. I bought another
    41 off sleezebay. Then the 50 came out. Reviews convinced me to buy
    one.

    Despite the similaries to the 48/49 series, the RPL is nice enough to
    use. Plus I've become a pretty good programmer.

    When they announced the discontinuation, I bought 5. One I've hacked
    to make the printer work. That's my daily user. The others are in
    cool, dry storage. I'm 65 now and expect to work another 20 years so
    I should have a lifetime supply.

    I suggest you do the same.

    John
    John DeArmond
    http://www.neon-john.com
    http://www.tnduction.com
    Tellico Plains, Occupied TN
    See website for email address

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From DavidM@21:1/5 to jibanes on Sun Mar 17 08:45:19 2019
    On Tuesday, February 19, 2019 at 7:43:51 AM UTC-5, jibanes wrote:
    Seems that my trusty 48GX's 2MB extension card causes resets; wiping all memory in the process. My guess is that, with time (~25 years?) the contacts between the 48gx and cards became rusty, causing the resets; but I can't confirm that.

    Other than migrating to the 50, which options are available?

    If it turns out to be the calculator, it's still possible to find decent used 48GX's on the usual auction and "for sale" sites. Like John, though, I would also encourage you to consider a 50g as a replacement. While I prefer the keyboard configuration
    of the 48's, the additional built-in functions, display, and speed of the 50g are compelling features once you start using it.

    - David

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Hic quondam locutus sum@21:1/5 to jibanes on Thu Apr 4 14:26:08 2019
    On Tue, 19 Feb 2019 04:43:49 -0800 (PST), jibanes <jibanes@gmail.com> wrote:

    Seems that my trusty 48GX's 2MB extension card causes resets; wiping all memory in the process. My guess is that, with time (~25 years?) the contacts between the 48gx and cards became rusty, causing the resets; but I can't confirm that.

    Other than migrating to the 50, which options are available?

    A problem with a memory card in port 2 would usually just cause a warmstart. Have you checked WSLOG for a "B" entry? That would indicate a bad RAM card or a low battery in the card.

    If you're losing all your memory, including HOME and port 0, then that would indicate that there's something wrong with the RAM in your 48 or perhaps something wrong with some other hardware component, such as the Yorke SoC.

    I'd recommend that you perform the looping BIST to check for problems. As for checking memory cards, I'd recommend this program for the HP48G/GX : https://www.hpcalc.org/details/7394 . Note that it's a destructive memory test, so be sure to backup.

    Regards,

    Hic quondam locutus sum

    --------------------------------------------------------------------------------

    Send e-mails to "NOhp48 Sat Palephnaught Adot Morg"

    ( Remove the capitalized letters spelling "NOSPAM" )

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)