his, but it would NOT be cheap. On a level of a 575 board if not more, I reckon.
still, swapping a logic board in a CC is easier that removing a PDS accelerator - in both cases the board has to be extracted from the machine.....
Well I guess if I get a full 68040 for my LC630 I guess I would have a spare 680LC40 which could go into such a device. But there is quite a bit of work on that 68040 board. A 68040 is still going to run slow sucking down from a 16Mhz, 16bit bus.
However, its getting much harder to get 575 boards in Australia, and buying from the EU and US is a waste of time, several times I paid buy now prices or won an auction, then the sellers just cancelled the sale and relisted rather than trying to post the item internationally or deal with an international sale, annoying a few days later. The annoying thing about that is other opportunities are lost or additional equipment is acquired for something you no longer have. I don't see this getting any better soon, and for some reason my currency has taken a huge dive, items are now twice as expensive, and post covid, it seems no prices have fallen either.
The other issue with accelerators is you loose the single slot of expansion. So no ethernet, no external video, or no DOS cards (on machines that can support them). I guess I could use a wifi modem on the serial port.
In the PC world there are some accelerators that disable the CPU, or go in and replace the CPU thus, don't harm expansion. I guess I am also interested in learning more about accelerators, and sticking a mystic motherboard, after half a dozen failed attempts to get one, I am not sure will fill my satisfaction hole.
Swapping a 20mhz or 25Mhz crystal would be an easy try and would still make an accelerator faster. A spicey-clock that actually outputted 32-50 Mhz would be ideal for non-040 macs