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JDR MCT 8-bit IDE controller

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  • Krille
    replied
    Originally posted by modem7 View Post
    Per [here], in the file that mikey99 posted, I do not see a partial string just prior to offset 1800h.
    Yeah, I made a mistake when removing the header. The string is not cut off.

    Is the situation perhaps:
    * 8 KB ROM fitted, with first 6 KB containing BIOS expansion code.
    * Card maps into motherboard memory space only the first 6 KB of the ROM.
    * Card contains one or more RAM chips.
    * With JP4 set to its default value of 2KB, card maps 2 KB of the card's RAM from address [ROM base + 6KB] onwards. JP4 can increase that to 8KB (perhaps requiring additional RAM to be fitted to the card).
    Yes, looking at the image of the card at the beginning of the thread there's a Goldstar GM76C28A-10 chip which is a 2 KB SRAM. You can replace that with an 8 KB chip (and move the JP4 jumper) to get an additional 6 KB RAM in the UMA. I don't know what the BIOS will do when/if it detects the additional RAM - probably nothing. It doesn't seem to use that much of the 2 KB RAM to begin with. My guess is that you can probably use that extra 6 KB as a block of UMB memory with something like USE!UMBS.SYS.

    Leave a comment:


  • vwestlife
    replied
    Mine has ROM version 3.3. MSD's Memory Browser reports it as 6 KB in size. It has separate messages for 8086/8088 and 286+ systems, although mine still shows the 8086 message even when used with a 286 system. It also suggests there should be a way to manually define the drive parameters, but I don't know how to access that -- the normal DEBUG g=c800:5 command doesn't work. And I don't know if the CI-1010 was a typo or a reference to a previous model.


    Leave a comment:


  • erikarn
    replied
    hm, what's the RAM being used for? Has anyone figured out?

    Leave a comment:


  • modem7
    replied
    Originally posted by vwestlife View Post
    The card has jumpers for 2 KB and 8 KB, and 2 KB is the factory default. So maybe the ROM is only 2 K in size?
    In regard to the jumper you write of, JP4, I see that the manual does not indicate the function of the jumper.
    I see that page 1-3 of the manual indicates that the default address range for the ROM BIOS is C8000 to C9FFF, i.e. 8 KB sized.
    And if the image of the BIOS ROM that mikey99 posted is examined, it is not a 2 KB block that has been repeated three times (i.e. code size is greater than 2 KB).

    Originally posted by Krille View Post
    EDIT: You're right, the BIOS ends with a cut off string.
    Per [here], in the file that mikey99 posted, I do not see a partial string just prior to offset 1800h.

    Originally posted by Krille View Post
    It looks like the area after the BIOS is actually RAM. The BIOS appears to be storing variables in offset 1Cxxh (beyond the 7 KB boundary).
    Is the situation perhaps:
    * 8 KB ROM fitted, with first 6 KB containing BIOS expansion code.
    * Card maps into motherboard memory space only the first 6 KB of the ROM.
    * Card contains one or more RAM chips.
    * With JP4 set to its default value of 2KB, card maps 2 KB of the card's RAM from address [ROM base + 6KB] onwards. JP4 can increase that to 8KB (perhaps requiring additional RAM to be fitted to the card).

    Using DEBUG, can you successfully write/read values to [ROM base + 6KB] ?

    Leave a comment:


  • Krille
    replied
    vwestlife, is your BIOS a different version?

    Leave a comment:


  • vwestlife
    replied
    The card has jumpers for 2 KB and 8 KB, and 2 KB is the factory default. So maybe the ROM is only 2 K in size? There is no setup or formatting routine in it. It just auto-identifies whatever drive(s) you connect to it. And yes, it does work with a CF card adapter, although it may display "Drive failure" during POST and then proceed to actually work fine with it.

    Leave a comment:


  • Krille
    replied
    Originally posted by modem7 View Post
    A possible problem:
    The 'ROM size' byte (see [here]) is 0C indicating that the code size in the 2764 ROM (8 KB) ROM is 6 KB.
    Because of that, the PCJRCART utility fetched and wrote 6 KB to file.
    I have encountered BIOS ROM's where the code extends past what the 'ROM size' byte indicates.
    It looks like the area after the BIOS is actually RAM. The BIOS appears to be storing variables in offset 1Cxxh (beyond the 7 KB boundary).

    EDIT: You're right, the BIOS ends with a cut off string.
    Last edited by Krille; May 24, 2021, 03:15 AM.

    Leave a comment:


  • modem7
    replied
    Originally posted by mikey99 View Post
    Adding that BIOS file here......
    BTW, mine also contains this header info, I think this is from the program I used to extract the BIOS (years ago)

    Filename: CE00.bin
    Created: 1980-01-01 00:03:26
    Desc: PCJRCART v1.1 ROM Extension dump
    Start: CE00:0000, len 0x1800
    1. I removed the header that was added by Mike Brutman's PCJRCART utility.
    2. Then I padded out the image to make an 8 KB sized file.
    3. Then I added the image to [here].

    A possible problem:
    The 'ROM size' byte (see [here]) is 0C indicating that the code size in the 2764 ROM (8 KB) ROM is 6 KB.
    Because of that, the PCJRCART utility fetched and wrote 6 KB to file.
    I have encountered BIOS ROM's where the code extends past what the 'ROM size' byte indicates.

    Leave a comment:


  • mikey99
    replied
    Adding that BIOS file here......
    BTW, mine also contains this header info, I think this is from the program I used to extract the BIOS (years ago)

    Filename: CE00.bin
    Created: 1980-01-01 00:03:26
    Desc: PCJRCART v1.1 ROM Extension dump
    Start: CE00:0000, len 0x1800






    Attached Files

    Leave a comment:


  • Krille
    replied
    mikey99 A copy of the BIOS from your card would also work for me.

    Leave a comment:


  • mikey99
    replied
    I'd also be interested in getting a copy of the BIOS to see if it's a more recent version.

    My card's BIOS contains the following string:
    Centos CI-1020 ROM BIOS Version 3.30for ISA 286, 386SX, 386DX, 486SL, 486 System.
    (c) Copyright 1990, 91. Centos Inc. All rights reserved.

    Leave a comment:


  • Krille
    replied
    "-Tested and Working condition"

    Somehow I doubt that (the tested bit that is - I'm sure it works fine).

    vwestlife, would you mind dumping the BIOS when you receive the card? Perhaps I can add support for it to the XUB. BTW, it's funny how the manual says JP4 is used during "factory testing" when it's very obvious that it's used for selecting the ROM size.

    Leave a comment:


  • framer
    replied
    You got lucky. "Genuine Rom Bios CI-1020 UC960029 PCI Card Desktop PC" I would have never found it with that description. PCI, card LOL.

    Leave a comment:


  • vwestlife
    replied
    I just got one on eBay for $12.99:

    https://www.ebay.com/itm/174562467027

    Leave a comment:


  • framer
    replied
    Thanks, I copied the images and save them for future reference. That's a card I'd buy if it could be had a a reasonable price. I've always like most of the MCT line of cards.

    11 years between posts, cool...

    Leave a comment:

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