Is it possible to upgrade a Lisa to run at 8 MHz or more by replacing the CPU?

[TorZidan]

I know about the unobtainable proprietary Lisa XLerator card and the relevant discussion at https://lisalist2.com/index.php?topic=594.0

But I wonder if anyone was able to speed up their Lisa by replacing just the CPU and the clock generator  with faster one?

I am sure this has been discussed in the past and also at 68kmla.org, but I can't find a good answer.

People mention the custom video refresh timings and the slow RAM, but somehow XLerator was able to overcome them. It seems that it is using the Lisa RAM for video buffer, and its own faster on-board RAM for system memory. 

Relevant links:

https://bitsavers.org/pdf/apple/lisa/hardware/1983_Whopper/Whopper_ERS_V2.0_Jul83.pdf describes a Lisa "Whopper" project  at Apple that never got completed. They wanted to run the CPU at 10 MHz: "A 10 MHz CPU clock has been selected because 10MHz  is 1/3 the 30MHZ clock used in the video circuit".

Why Lisa didn't use 8MHz 68000? https://68kmla.org/bb/threads/why-lisa-didnt-use-8mhz-68000.39609/

A 68010 in a Lisa? https://lisalist2.com/index.php?topic=43.0

[ried]

You know, I was recently wondering the same thing. Some time ago I picked up a Macintosh Plus with a 16MHz "Brainstorm Accelerator" installed and wondered what it might take to get that part working in a Lisa. It looks to be quite simple.

I'm sure there are quite a few Lisa-specific complications to consider, and sigma7's XLerator is a much more robust and capable solution with additional RAM, SCSI, FPU support and so on.

Still, I wonder.