| KISS68030 running at 40MHz [message #10640] |
Wed, 27 March 2024 05:59  |
denis2342
Messages: 23
Registered: February 2017
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Junior Member |
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Hi
After converting the KISS68030 CPU board to a MAX707 chip for startup I was interested if it could run with 40MHz. On the logic analyser I could see it running for about 10ms but then it stopped. I assumed the board was accessing the MFPIC card which is way to slow for such speed even with the max Wait States. So I made a special version of the really awesome gogoboot.rom which puts the console on the USBFIFO card and disabled anything else accessing the MFPIC board.
Then I turned on and the board did run fine. Also started the Memtest and it is happily running without problems. I know this is not useful in any way. But I just want to report it anyway what this board is capable of.
Denis
PS: the max 707 chip monitors the voltage at startup and only releases the RESET line after about 200ms so the CPU starts after all other components have started.
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