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alenppc · 14 August 2013, 15:16

I received the new MC68040RC40A, K63H mask and fitted it to the A3640 to replace the old 25 MHz D50D mask cpu supplied by Commodore. It runs a lot cooler!

Unfortunately the Amiga would not boot at 33 Mhz even with the delay line hack, it is possible that new IDE chips might be responsible.

However, it runs stable at 30 MHz, with a nice 20-22% performance increase except that some zorro cards refuse to work at this speed. Not sure if the delay line hack might have something to do with this, or is it just a clock issue. I should try reversing it and running at 30 Mhz to compare.

14 August 2013, 15:16	#9
alenppc Registered User Join Date: Apr 2012 Location: Canada Age: 44 Posts: 910	I received the new MC68040RC40A, K63H mask and fitted it to the A3640 to replace the old 25 MHz D50D mask cpu supplied by Commodore. It runs a lot cooler! Unfortunately the Amiga would not boot at 33 Mhz even with the delay line hack, it is possible that new IDE chips might be responsible. However, it runs stable at 30 MHz, with a nice 20-22% performance increase except that some zorro cards refuse to work at this speed. Not sure if the delay line hack might have something to do with this, or is it just a clock issue. I should try reversing it and running at 30 Mhz to compare.