CompuServe Messages

My reply to this: ——————– >consider >a 68020 at 14 MHz, like the a1200, is equivalent to a 28MHz 68000. However, the SupraTurbo 28 MZ 68000 accelerator that I have seems to have performance numbers that are much better than the A1200 (14Mz 68EC20). ——————— You're right and I'm wrong for a couple reasons. The accelerator you have, with a cache, makes the 68000 at 28MHz have MORE than 4 times a stock 68000. I wasn't aware of a cache, this would basically take away the 68020 advantage. The 68030 has two caches, its main advantage over the 68020. The other major mistake I made is that I FORGOT the CPU in a 1200 isn't a 68020, its an EC020 and does not access memory to a full 32 bits in all cases, reducing the "double speed" apparent advantage a 68020 has on a 68000. I still believe my comparison would be true with a full 68020 versus a cacheless 68000, but since neither of those is true, the comparison was inaccurate. I do believe your computer is faster than a 1200 (but not the one next to me, with a 40MHz 68030 :-> I hate those 68EC0x0 chips, they are degraded a lot more than they would have you believe. The 3000 wouldn't even work with a 68EC030. The EC020 isn't missing much – but is 24-bit memory address space, like a 68000. The EC030 and EC040 are missing the MMU, confusing to the user since you will run a Virtual Memory program, and it won't work, even though you have a 68030. But you don't have a 68030… And worse there is a version, of the 68040 without the FPU. Great, how do you add it on later. You can somehow try to add a 68882, but no program will use it right because they think you have a 68040… The EC chips are throw-away processors. You will always upgrade them eventually, it seems.