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Thread: ACA 1233n

  1. #21

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    After speaking to Individual, he says the boards bitlord has modified will fail. It’s due to the memory being pushed beyond its spec.

  2. #22
    anemo's Avatar
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    Quote Originally Posted by cypher007 View Post
    Did you change the cpu to a 50mhz one?
    The crystal frequency is divided by two so running at 50 MHz would require a 100 MHz crystal.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

  3. #23

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    Yes I know. I meant when you tried the overclock did you change the cpu from a 40mhz one to a 50mhz?

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    Quote Originally Posted by cypher007 View Post
    Yes I know. I meant when you tried the overclock did you change the cpu from a 40mhz one to a 50mhz?
    Sorry, I misread your comment

    No, I used the stock 40 Mhz CPU. I *think* that the CPU should do at least 48 Mhz which I also tried but I guess it's depending on the CPU mask (mine is 1F91C). I'm not sure my 96 Mhz and 100 Mhz crystals are 100% OK since I bought them from Alibaba. I may try other from a more reliable source in the future.

    In the 90s, I overclocked my Blizzard 1230/50 to 60 Mhz and it ran pretty good but crashed a few times when playing Doom. The CPU got pretty hot and I had not additional cooling like a heatsink but it recided in a tower with pretty good airflow.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

  5. #25

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    Have you checked to see what the ram is rated for?

    id also like to find out if people who bought or used overclocked cards from users have had any fail before I risk it.

  6. #26
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    Quote Originally Posted by cypher007 View Post
    Have you checked to see what the ram is rated for?

    id also like to find out if people who bought or used overclocked cards from users have had any fail before I risk it.
    The RAM (EM63A165TSC-6G) seems to be rated for 166 Mhz. Maybe the ACA CPU clock frequency (80 Mhz stock) is multiplied by two to generate 160 Mhz. I'm just guessing now.

    EDIT: It would be interesting to find out how the clocks are configured for the ACA1233n-55 too and if it has the same RAM modules.
    Last edited by anemo; 3rd June 2020 at 07:20.
    A1200 | WB3.1 | 4Gb CF | ACA1233n/40+FPU | PCMCIA wifi card + C64 (-82 Breadbin) | C1541 | Pi1541

  7. #27

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    Yes it’s x2 which the problem. So will be running at 200mhz.

  8. #28

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    Apparently it’s a differently configured CPLD on the 55.

  9. #29
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    What's the point in overclocking an 030 by 10MHz? What's the real world difference vs. the risk of damage and instability
    Amiga A1200, 3.1 ROMs, ACA 1233n with FPU, 4GB KingSpec DoM SSD, Workbench 3.1

  10. #30

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    Quote Originally Posted by A1200 View Post
    What's the point in overclocking an 030 by 10MHz? What's the real world difference vs. the risk of damage and instability
    I would use my 50mhz 030 I have from my dead blizzard mk3, if I was going to try it. But it seems it would need the timings altering in the CPLD, something beyond my knowledge.

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