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Thread: Replacement 286 BIOS for 286 Modular.

  1. #1
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    Default Replacement 286 BIOS for 286 Modular.

    Is there a better BIOS I could put in my Metalis 286. It has the BIOS on a little daughter board so I could replace it. Can I replace it and hopefully unlock the 60MB HDD limit?

  2. #2

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    Quote Originally Posted by twistedpneumatic View Post
    Can I replace it and hopefully unlock the 60MB HDD limit?
    There's no need to replace the system BIOS. Just install a copy of XTIDE Universal BIOS.
    Looking for a cache card for the "ICL ErgoPRO C4/66d V"

  3. #3
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    You can use Dynamic Drive Overlay software to get around the bios limit as well.
    Thomas Byers (DRI)- "You'll have a million people using the A> [MS-DOS prompt] forever. You'll have five million using [nongraphic] menu systems such as Topview, Concurrent PC-DOS, Desq, and those types. But there'll be 50 to 100 million using the iconic-based interfaces."

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    I recently had a 286 system with a faulty bios and found the the best solution was to put a working copy of the same bios back into the board. The keyboard controller often doesn't play well with a bios from another vendor.

    I also used an old network card to host a copy of XT-IDE (AT) to overcome the drive table limitation.

  5. #5

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    You may be able to get by with another BIOS, but I would check that it's for the same chipset. Also this is a laptop right? If so, I would also recommend the Dynamic Drive Overlay software.
    Looking for: OMTI SMS Scientific Micro Systems 8610 or 8627 ESDI ISA drive controller, May also be branded Core HC, Please PM me if you want to part with one.

  6. #6

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    Quote Originally Posted by Krille View Post
    There's no need to replace the system BIOS. Just install a copy of XTIDE Universal BIOS.
    May I point you to my site: A bigger hard disk drive for your 80286 PC? It describes a hack to add the XTIDE BIOS to the existing BIOS. Condition: you must have at least some 12-16 KB of free space on it. And yes, it describes the hack for this type of Commodore PC but the general idea should be clear

    Be careful, it is not something done in a few minutes and yes, it describes the hack for this type of Commodore PC but the general idea should be clear IMHO.

    Have fun!
    With kind regards / met vriendelijke groet, Ruud Baltissen
    www.Baltissen.org

  7. #7
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    There are some "generic" IBM AT compatible BIOSes listed here: http://www.minuszerodegrees.net/bios/bios.htm The AMI bios allows custom drive types.

    To use a generic BIOS, your 286 must be 100% IBM AT compatible internally.

    You should also consider editing the drive types in your existing BIOS. Of course you will need an EPROM programmer and some extra EPROMS. Personally, I would consider that the "cleanest" solution with the lowest probability of compatiblity issues. I think there were some tools to help with that, but it is mainly a matter of editing a few bytes in a lookup table,recalculating a checksum, and on a 286 splitting back up in to HI/LO roms.

    If you dump and post the ROMs perhaps someone can help out with that. And it would be good to archive the ROM set.

  8. #8

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    Quote Originally Posted by RuudB
    I could either calculate a new checksum or disable the routine. The last was the most simple solution by replacing a 'je' command (Jump if Equal, read: jump if checksum is zero) by a 'jp' command (JumP). Again changing only one byte.
    JP means Jump if Parity which is not the same as an unconditional jump (JMP). BTW, I would just update the checksum instead of disabling the check.
    Looking for a cache card for the "ICL ErgoPRO C4/66d V"

  9. #9
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    I will try the Dynamic Drive Overlay thing and see how it works. It only supports 20,30,40 and 60MB preset drives. No CHS settings listed but it will recognize other drive types but only the ## drive types (1-37)

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