techknight:
It's much, much simpler than that. Whenever the m68040 is talking to the motherboard, it is running at 25 MHz. Whenever it isn't, it's running at 50 MHz. This is why purely synthetic benchmarks such as dhrystone show 50 MHz speed - the whole main loop of the benchmark fits in the m68040's caches, so 99% of the time the benchmark is running, it's running at 50 MHz. There are no wait states - just slow states
rsolberg:
I bought one a while back, but when I installed it, I immediately knew it was a counterfeit because it was an LC040. I got my money back, but I'll definitely check any I get in the future.
Aside from seeing how hot the chip gets, I don't know if there's a way to verify that it's a late mask - errata all appear to have been fixed in the E71M and E42K masks. Hmmm...
Also, I didn't go with that seller because of the ridiculous shipping price, although I was going to make an offer, but instead I got mine for $55 USD shipped.
It's much, much simpler than that. Whenever the m68040 is talking to the motherboard, it is running at 25 MHz. Whenever it isn't, it's running at 50 MHz. This is why purely synthetic benchmarks such as dhrystone show 50 MHz speed - the whole main loop of the benchmark fits in the m68040's caches, so 99% of the time the benchmark is running, it's running at 50 MHz. There are no wait states - just slow states
rsolberg:
I bought one a while back, but when I installed it, I immediately knew it was a counterfeit because it was an LC040. I got my money back, but I'll definitely check any I get in the future.
Aside from seeing how hot the chip gets, I don't know if there's a way to verify that it's a late mask - errata all appear to have been fixed in the E71M and E42K masks. Hmmm...
Also, I didn't go with that seller because of the ridiculous shipping price, although I was going to make an offer, but instead I got mine for $55 USD shipped.