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Thread: A2630 @ 54.2 MHz! Mod

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    Lightbulb A2630 @ 54.2 MHz! Mod

    Hello my fellow AmiBayer's, I finally decided to upload images of my first accelerator speed up project. This is NOT a DIY thread! But it's the perfect thread for window shoppers.

    This mod or hack if you prefer is 10x more complicated than my A3640 speedup hacks... and you would have to be crazier than me just to try it! But I haven't forgotten about the window shoppers so here is a brief summary of what very many hours of hard work and stupidity can accomplish:

    - 68030 + 68882 @ 54.2 MHz
    - Memory timing optimized for 70 ns DRAM
    - Refresh cycle time reduced 2 clocks
    - 68000 state machine optimized
    - DKB2632 memory timing optimized with burst support @ 54.2 MHz
    - DKB2362 memory modified for NOWRAP burst support
    Attached Thumbnails Attached Thumbnails A2630_AIBB54B.PNG   DKB2632_54.jpg   A2630_54.jpg   A2630_AIBB54A.PNG   DKB2632_AIBB54A.PNG  

    DKB2632_AIBB54B.PNG  
    Last edited by SpeedGeek; 8th May 2018 at 23:15.

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    that's a lot of wires jumping around on that board....

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    Ooh, spiffy. That'd be fun to have for mine...
    Computers: Amiga 1200, DEC VAXStation 4000/60, DEC MicroPDP-11/73
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    Amibayer! LTAC's Avatar
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    Do you notice that the CPU&FPU are overheating or not?
    CBM AMIGA: 500/600/1000/1200/2000/3000D/A3000T :thumbsup:/CD32/A4000T+CSPPC+PicassoIV+Deneb...No CDTV :-(
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    Amiga tweaker Amibayer! Buzzfuzz's Avatar
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    Well, why not make a detailed post with all you have done and some better photos.
    I'm sure most of us can do it, so we would like to now how
    Wonderful Indonesia

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    Wink

    @Nathanieltolbert:
    The jumper wires are only part of the story my friend, the logic has major (unseen) modifications!

    @commodorejohn:
    Yes, it's possible to overclock an A2630 but whats possible can also be very impractical!

    @LTAC:
    The original 25 MHz 68030 & 68882 were replaced with 50 MHz versions so they are barely overclocked @ 52 MHz!

    @Buzzfuzz:
    Sorry, my DSC is an El-Cheapo and doesn't take very good close ups. I can get slightly better quality with the flash than in flouresent light. So the next time I'll use the flash. I did upload some exellent quality GIF AIBB images but they were degraded to poor quality jpegs by Amibay's server!
    Last edited by SpeedGeek; 21st September 2012 at 20:26.

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    I'm really interested in how you accomplished this! I would like to see the detailed instructions as well. Ed has several of these cards hanging out in A2000's he has in the shop and I think it would be a mighty cool hack project to try this!

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    Ya' Like it Retr0? VIP Zetr0's Avatar
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    @SpeedyG

    this is a delight to see =)

    my sincere thanks for sharing
    8)Flux Mastah' Zee8)
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    Can we get a Sysinfo result please? Very good work my friend.

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    Smile

    @Nathanieltolbert:
    I don't have detailed instructions for this project. I started working on this project in 2003 and finished in 2008! Maybe all the hints I made about how difficult this project really was were mistaken as sarcasm or dry humor. If someone had done this before me and given me some idea of what I was getting into I would "JUST SAY NO!"

    @Zetr0:
    Thanks for the kind remark my friend! I knew you would appreciate this extraordinary work of hackery!

    @abraXXious:
    SysInfo is a really nice looking benchmark program but when it comes to accuracy AIBB is Par-Excellence second to none. (excepting the 68060 of course!). SysInfo almost always miscalculates the CPU speed. It's small cachable MIPS benchmark makes 040 and 060 machines appear much faster than they really are. (AIBB uses a loop of six thousand diverse instructions so it's instruction test is much more realistic on CPU+CACHE+MEMORY performance). On my A3000 9 out of 10 times SysInfo reports N/A for Ramsey and Gary. Enough said.

    P.S. I just uploaded much better quality PNG AIBB images!
    Last edited by SpeedGeek; 4th March 2011 at 17:12.

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