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Thread: A2091 14Mhz SCSI mod

  1. #51
    gseb's Avatar
    Join Date
    Apr 2012
    249 (100%)


    Unfortunately, there is nothing special about sync mod in Aztecmonster user guide.
    As far as I know, some people have the Aztecmonster running sync on other Amiga scsi boards... Should be OK.

    Just in case, I upgraded the A590 scsi chip with a -008.

    I put the switches like this on my A590 : 1,2,3 up and 4 down. Close means up in the A590 FAQ if I understood well.

    As in the GuruRom guide, I only put the device number. It's written "providing the address (TID) is sufficient"

    The scsi device ID (Aztecmonster) is set to 0 per jumper.

    I modified the the S-S : C:OmniScsiCtrl 0 SYNCHRONOUS

    Sysinfo gives the same result as in my previous post. No differences.

    Select timeout reg $2D
    synch Transfer reg $2C

    Are the registers as it should be ?

    Thank you

    I am using sysinfo for now just because I am connecting my A500+ test machine to a monitor through VGA adapter. Resolution used by RSCP is not good for this monitor......

    EDIT :

    I just connected the Amiga to a TV to give it a try with RSCP.

    Strangely, sysinfo does not show differences between SYNC and ASYNC.

    RSCP does, see pictures. First one in ASYNC and second with SYNC enable in s-s.
    Sync is eating all the CPU ressource....

    Click image for larger version. 

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    Last edited by gseb; 30th June 2019 at 15:02.

  2. #52
    Finger lickin' good Amibayer! matt020's Avatar
    Join Date
    Dec 2009
    Western Australia
    Western Australia
    7 (100%)


    Any updates to this? I have performed the 14mhz mod, and noticed no issues so far.
    Amiga 500 / 2000 / 1200 / CD32

  3. #53
    voyager_1701e's Avatar
    Join Date
    Jan 2014
    Maitland, NSW
    125 (100%)


    Quote Originally Posted by Tajmaster View Post
    I did this today on an A2091 card thats going in an A2000 I will be sellling, the results are AWESOME!
    I did this mod yesterday, what a pleasant surprise.....same result, 2.2mb / sec on a stock 68k system - very pleased

    A1200 ACA1221 ACA1221lc, A600 ACA620/Vampire II Black, A500,A500+ and A500++ ACA500+ and Vampire II, A2000 Recreated with VXL30, C64 / C64 Reloaded

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