maceffects
Well-known member
Maybe someone can correct me but I thought the the speed should match the speed of the processor? Shouldn’t they be 16mhz/16mhz?
Nope, see the datasheet for the MC68882 (specifically page 5-98/PDF page 3). The CPU and the MC68882 work fine together at different clock speeds.Maybe someone can correct me but I thought the the speed should match the speed of the processor? Shouldn’t they be 16mhz/16mhz?
Thanks, I remember some processors used to be really fussy about that. I’m glad this allows for flexibility.Nope, see the datasheet for the MC68882 (specifically page 5-98/PDF page 3). The CPU and the MC68882 work fine together at different clock speeds.
If you look at my screenshot from MacBench, you can see the results for two frequencies (@16M and @40M; the CPU was always at the default 16M). 40M gives a slight boost to the benchmark score. The card itself has a jumper to configure which clock to use (OSC means the oscillator on the card, SYS is using the C16M signal from the logic board which is 16M).Thanks, I remember some processors used to be really fussy about that. I’m glad this allows for flexibility.
Well, you can buy individually, or i can order a load en-masse, and distribute?Thanks everyone. So I'd definitely buy one, and hopefully Kai can give us a link to the NOS 40s...I'd be all in!
Super cool, glad to see someone picked up on this, let us know how it goes!I am currently working on a derivative of this design that would support the 50 MHz part 68882.
I realized I still have two units of my original batch that I planned to sell (but the thread disappeared in the forum crash) - if you're interested just shoot me a PM!Any good place to get one of these assembled? A Classic II recently came into my possession and I'm interested in giving it toys, but my soldering skills are pitiable.