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Thread: A2091 14Mhz SCSI mod

  1. #41
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    If you have a Guru ROM it will assume the 33C93A is still running @ 7 MHz.

    EDIT: The 33C93A_14MHz Util does NOT seem to work with the Guru ROM so you should use rdbctrl to set the RDB flag to ASYNCHRONOUS or for versions 6.11+ setting JP5-4 on disables the initial SDTR. Another option is to install a jumper block to switch back to 7 MHz if you really want to enable SYNCHRONOUS mode.

    (Sorry this Util was a quick hack for the C= 7.0 ROMs).


    P.S. If you don't have a Guru ROM but you have something faster than a stock 68000 see this thread:

    http://www.amibay.com/showthread.php?t=47494
    Last edited by SpeedGeek; 5th October 2013 at 03:54.

  2. #42
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    Quote Originally Posted by waltermixxx View Post
    I just hacked my 2091 and everything seems to be working fine...I burned a U12 eprom with the mod, and it seems to be working fine

    my transfer speed for the drive i have in place went from 1.3mb/sec to about 1.95 that is with 1 meg of ram added to the scsi card... ( yup got it working)

    Thanks again for this great thread
    I introducted a Fusion40 into my system and it is working fine, ( it has 20megs of ram in the 32bit space) my 2091a scsi card has 2megs of ram, but now my speeds have dropped to 0.354 mb per second....

    any suggestions speedy

  3. #43
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    Quote Originally Posted by waltermixxx View Post
    I introducted a Fusion40 into my system and it is working fine, ( it has 20megs of ram in the 32bit space) my 2091a scsi card has 2megs of ram, but now my speeds have dropped to 0.354 mb per second....

    any suggestions speedy
    Hi waltermixxx!

    Your Fusion40 has probably configed it's Fast memory as extended 32 bit memory. So you can try to config some of it in 24 bit address space (just like the A2091 Fast memory) or you can try 2 solutions already posted on this thread:

    vbak2091 and A2091ToFastV2.0

    http://aminet.net/package/driver/media/vbak2091

    http://www.amibay.com/showthread.php?t=47494

    I hope this helps!
    Last edited by SpeedGeek; 3rd October 2013 at 22:35.

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    neither seemed to help, i'm going to try to unmod it and see what happens... see if its worse or better than the 345k i was getting ...

  5. #45
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    ** 3RD NEWS UPDATE **

    The 33C93A_14MHz util in post #1 has been replaced by a new 33C93A_Config tool. Since you now have the option of using a 14MHz patched ROM or BindDrivers version you don't need to use an unreliable kludge to attempt to correct SCSI timings post boot.

    All you need to do is verify the correct 33C93A Config settings for your CLK speed and this is exactly what the new tool does!
    Last edited by SpeedGeek; 12th April 2014 at 02:22.

  6. #46
    ...is there some beer left? maw2k's Avatar
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    I assume I need GuruROM v6.16 that this works properly? I have 6.14 and get only 1mb/s.

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  7. #47
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    @maw2k

    Your assumption is probably wrong. Also, you don't provide any details about the hardware config which provided the above results. So, your still quite a long way from making any better assumption(s).

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