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Help with an Intel Above Board/AT

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  • AndyM1981
    replied
    Also, for what it's worth the board uses the NEAT chipset.

    Leave a comment:


  • AndyM1981
    replied
    Originally posted by mikey99 View Post
    AndyM1981, can you provide more detail about the computer you are testing the Above Board in ? Is this a 286 clone ?
    Also, how much memory is installed on the motherboard ?

    I also have an Intel Above board but have only used it in an IBM 5170 AT.
    Sorry about the delay in responding, I'm still on a delay of my posting going through.

    Sure thing. The computer is a Packard Bell PB800 AT Clone with 1MB of RAM installed on the motherboard. The memory is configured for 640 KB of conventional and the rest is remapped as 384 KB of extended memory. I have both video and system BIOS shadowing turned off. I've only found a couple of links relating to the board. There isn't a lot out there. I have a revision C board.

    https://stason.org/TULARC/pc/motherb...EVISION-C.html
    https://web.archive.org/web/19991109...0/pb800man.asp

    The system has a 12 MHz CPU. Apart from not initializing the 64K chips the Above Board seems to run as stable as can be so I don't think it's a bus speed issue. There are no jumpers to change the conventional/extended memory split on the board and I can't change it in the BIOS. It seems that I'm "stuck" at 640K and thus no backfill is possible.

    Leave a comment:


  • mikey99
    replied
    AndyM1981, can you provide more detail about the computer you are testing the Above Board in ? Is this a 286 clone ?
    Also, how much memory is installed on the motherboard ?

    I also have an Intel Above board but have only used it in an IBM 5170 AT.

    Leave a comment:


  • AndyM1981
    replied
    Originally posted by jafir View Post
    There is a floppy image, that I think is for this card, at minuszerodegrees. I don’t know if it will help. There is also a manual, but it’s for a slightly different card.

    http://www.minuszerodegrees.net/manuals.htm#Intel
    This was actually where I initially got the drivers. I also thought that the manual would be useful, however it turns out that the DIP switch settings between the two cards are completely different much to my surprise.

    Leave a comment:


  • AndyM1981
    replied
    So I ran Checkit and it did not report any errors. That being said it only saw the 1536 KB of memory on the card that was initialized in the driver, so it didn't really test the 64K chips.

    I have ROM and and Video shadowing turned off. That 384 KB have been turned into extended memory. I tried disabling that to see if it made a difference and there was none.

    Sadly my motherboard has no jumpers to allow me to change the conventional memory allotment. It's stuck at 640 KB.

    This has me stumped. I'm thinking in the end the only way to fix this is to either pull the chips and leave it at 1.5 MB, or remove the 64K ones and replace them with 256K.

    Leave a comment:


  • jafir
    replied
    There is a floppy image, that I think is for this card, at minuszerodegrees. I donít know if it will help. There is also a manual, but itís for a slightly different card.

    http://www.minuszerodegrees.net/manuals.htm#Intel

    Leave a comment:


  • Moogle!
    replied
    Also, do you have any rom shadowing or memory remapping options turned on in the BIOS? Does the motherboard have jumpers that define the amount of ram, which was common on older 286s.

    Leave a comment:


  • AndyM1981
    replied
    Originally posted by Moogle! View Post
    Is your ISA bus also running at 12Mhz? If so, are all your chips 80ns or faster? If it is 6Mhz, are they all at least 150ns or faster? Does it has jumpers for RAS and CAS? Are they set correctly? Have you tried 3rd party programs like Checkit and such to see what they say?
    I'll give Checkit a try and see what it says.

    As far as I know the bus is running at the ISA standard 8 MHz. I actually thought it might be the case and downclocked via the Turbo button, but the memory test on the board then froze on POST. It was fine back at the faster 12 MHz clock.

    All the chips on the board are rated for 150ns. Other than the error on startup the board is working fine and the remainder of the memory is accessible. I've loaded it hard in Windows/286 with multiple applications open at once to test it and it has been fine.

    No jumpers for that on the board. Just the DIP switches to select memory split between conventional backfill, extended and expanded as well as the chip size and the IO address.

    If I remember correctly the ISA bus includes a wait state specifically to stabilize things on higher clocked machines like 286s, I could be wrong however.

    Leave a comment:


  • Moogle!
    replied
    Is your ISA bus also running at 12Mhz? If so, are all your chips 80ns or faster? If it is 6Mhz, are they all at least 150ns or faster? Does it has jumpers for RAS and CAS? Are they set correctly? Have you tried 3rd party programs like Checkit and such to see what they say?
    Last edited by Moogle!; March 18, 2020, 08:26 AM.

    Leave a comment:


  • AndyM1981
    replied
    Originally posted by maxtherabbit View Post
    Tried these versions offered here?
    http://files.mpoli.fi/hardware/SETUP/INTEL/
    Just gave those both a try and still the same.

    I've also tried versions from 1987 and 1989 that give the same error. At least the one from 1989 does it without screaming out the PC speaker so I've switched to that one for now.

    Did anther test on the chips for 15 rounds of the Intel confidence tool and they still checked out, so I'm stumped.

    Perhaps the 64K chips are dedicated to providing conventional memory backfill and if they're not used it generates an error?

    Leave a comment:


  • maxtherabbit
    replied
    Originally posted by AndyM1981 View Post
    Thanks for the link!

    After reading through the relevent files it definitely confirms that having 64K chips in bank 0 with 256K chips everywhere else is a valid configuration. I also confirmed that my DIP switches are set correctly. Still no idea why the EMM.SYS driver is reporting the smaller chips as faulty.

    I'm going to hunt around and see if I can find another version of the driver other than the two that I have.
    Tried these versions offered here?
    http://files.mpoli.fi/hardware/SETUP/INTEL/

    Leave a comment:


  • AndyM1981
    replied
    Thanks for the link!

    After reading through the relevent files it definitely confirms that having 64K chips in bank 0 with 256K chips everywhere else is a valid configuration. I also confirmed that my DIP switches are set correctly. Still no idea why the EMM.SYS driver is reporting the smaller chips as faulty.

    I'm going to hunt around and see if I can find another version of the driver other than the two that I have.

    Leave a comment:


  • Cimonvg
    replied
    okay , same file another server..
    http://annex.retroarchive.org/cdrom/...R40/index.html

    /cimonvg

    Leave a comment:


  • AndyM1981
    replied
    Originally posted by Cimonvg View Post
    hello
    some information here:
    http://cd.textfiles.com/pier02/010a/
    INTMEMRY.ZIP Above Board Technical Specs for Adding/
    Dealing with Memory - all.
    ..but if it answers you question - i dont know
    /cimonvg
    Sadly the zip file seems to be empty.

    Leave a comment:


  • Cimonvg
    replied
    hello
    some information here:
    http://cd.textfiles.com/pier02/010a/
    INTMEMRY.ZIP Above Board Technical Specs for Adding/
    Dealing with Memory - all.
    ..but if it answers you question - i dont know
    /cimonvg

    Leave a comment:

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