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BIOS for Toshiba T2100

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  • pavery
    replied
    20211009_092914[1].jpg
    Hi Branko. You were going to double check that second Debug command. As it's written, I just get an error.
    Last edited by pavery; October 8, 2021, 12:34 PM. Reason: Added screen pic

    Leave a comment:


  • silence012
    replied
    Hey, that is pretty cool. This was version of BIOS in my original chip. Could you maybe send me "bin" file produced by first and second command?

    Leave a comment:


  • pavery
    replied
    The BIOS chip is located bellow keyboard middle-left.
    Just the info I was looking for as with the top lifted up but with the display still attached, it was easy to lift the keyboard & reveal the BIOS chip. See photo showing I have ver 4B:

    Philip

    20211003_174358[1].jpg

    Leave a comment:


  • silence012
    replied
    Hi Philip,

    In order to open it, you have to disassemble display first. I don't have Maintainence Manual for it, but yoi can download one for T3100 and the procedure is the same.
    Anyway, it is a little bit time consuming

    The BIOS chip is located bellow keyboard middle-left.

    If it is complicated for you, just do not open it..BIOS export will be enough...I can compare it with the one I have and see if it is different.

    For the BIOS export, second command should be ok, but I will double check. It should be address space between F800 and FFFF, so the last 32K from address space.

    When you export file...you should check it if it is only have FF in it, or different values. When I export file using first command it was exported successfully but all file was filled with FF.

    Good luck with FDDs

    Branko

    Leave a comment:


  • pavery
    replied
    OK, I've opened up my T2100 but... the display cabling is all shrink-wrapped shut. I don't really want to open all that up as there's a lot of it. Is there a way of glimpsing the BIOS chip without fully dismantling the machine? Where is the BIOS on the motherboard?

    I did the above Debug & the first variant worked fine & wrote a file to disk. The second declared an error at: -M F800:0 FFFF 0100. Shouldn't FFFF be 8000?

    My disk drives are flaky and it takes multiple attempts to get a write, but hopefully I'll get two files written, then I can see about reading them on a later PC & send them to you.

    Philip

    Leave a comment:


  • pavery
    replied
    Great that you got yourself a BIOS. I'll try this weekend to open up my T2100 & see what BIOS version I have.

    Philip

    Leave a comment:


  • silence012
    replied
    Hi Pavery,

    I managed to get BIOS dump, and burned it into chip. It is newer version then my was, but it did work This one is version 004C and it is probably dumped by some ROM reader.

    Anyway, I played little bit with DEBUG after that. Both commands are here:

    C:\> DEBUG
    -N MYF000.BIN (resulting file will be named MYF000.BIN)
    -R BX (set BX=0000H/CX=8000H as count of bytes to write, 00008000H = 32K)
    BX 0000
    :0000
    -R CX
    CX 0000
    :8000
    -M F000:0 8000 0100 (copy 32K bytes from F000:0 to offset 0100 in local segment)
    -W 0100 (write from offset 0100 in local segment)
    Writing 8000 bytes
    -Q


    C:\> DEBUG
    -N MYF800.BIN (resulting file will be named MYF000.BIN)
    -R BX (set BX=0000H/CX=8000H as count of bytes to write, 00008000H = 32K)
    BX 0000
    :0000
    -R CX
    CX 0000
    :8000
    -M F800:0 FFFF 0100 (copy 32K bytes from F800:0 to offset 0100 in local segment)
    -W 0100 (write from offset 0100 in local segment)
    Writing 8000 bytes
    -Q

    My T2100 has only one BIOS ROM. And content of BIOS rom is identical with export of second command (F800 - FFFF).

    I guess that first command is for other rom chip which I don't have. Also not sure what it would be...maybe some testing tools, etc.

    If you have time, you can try execute both commands and see how it looks like. Would be also good if you can open your computer and see which BIOS version do you have. It is on the sticker on top of BIOS chip.

    Cheers,
    Branko

    Leave a comment:


  • pavery
    replied
    Hi Branko. I'm home now so can dump BIOS contents. Have you devised a software method yet?

    Philip

    Leave a comment:


  • silence012
    replied
    Hi Philip,

    I usually do it with EPROM programmer....just read the chip. Never try do it with program.

    If you don't have EPROM programmer, I saw some solutions on internet:

    https://www.vcfed.org/forum/forum/ge...bios-to-a-file
    http://www.dosdays.co.uk/topics/bios.php

    I'll do a little bit research about this topic as it sounds really interesting to me. It is at least safer as you cannot put chip opposite

    Branko

    Leave a comment:


  • pavery
    replied
    OK, I'll also need to get a 3.5" drive connected up to my XP box, it currently only has 5.25" capability. You see 8086 & MSDOS are at the "modern" end of my collection, my specialty is 8-bit TRS-80. I haven't had the T2100 long & have barely used it, but as I'll need 3.5" disk capability to move programs from the internet to the T2100, then that job needs to be done anyway.

    Also, how do I dump the BIOS? Have you got a program that will do this? Perhaps you could send it to me?

    Philip

    Leave a comment:


  • silence012
    replied
    Hi Philip,

    Thanks for info. I would really appreciate if you can do it for me. If anyone else can do it in mean time it is also good

    My version is also with two floppy drives. So far screen is ok, no dead spots. Hinge plastics were broken but I will fix them. It worked fine...I opened it for cleaning...and accidentally put chip back in opposite direction and I burned it

    For now, I only have image of original DOS (in German) and image of Toshiba Test/setup tools. I don't have manual, and it is impossible to find online

    I ordered new chip from e-bay and if I find BIOS hopefully I can bring it back to life
    Branko

    Leave a comment:


  • pavery
    replied
    Hi Branko

    I have an 8086 T2100 & could probably dump the BIOS, but I'm away from home for 2 weeks so it would have to happen after that. Perhaps someone else can do it sooner for you? The T2100 are super-rare (well, online at least). What status is yours in? Do you have the Technical Manual (Repair) for it by any chance?

    Mine is an early unit with 2 x floppy drives. Their operation is a bit intermittent & 1 column of gas-plasma pixels is out, but otherwise works fine.

    Philip

    Leave a comment:


  • silence012
    replied
    BTW, I am talking about older version of T2100 with 8086 processor.

    Leave a comment:


  • silence012
    started a topic BIOS for Toshiba T2100

    BIOS for Toshiba T2100

    Hi there,

    I managed to burn my bios chip on my Toshiba T2100.

    I would really appreciate if anyone can make a dump of it's BIOS and send it to me.

    My BIOS version is 004B, but I am happy to try any other version of the T2100.

    My T2100 model is PA7031E

    Thanks,
    Branko
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