John wrote:
I am wondering what the speed differences are between the Z80, Z80A, Z80B, and any other Z80 versions? I have a box of old Apple II cards that I am culling. Among them are several Z80 cards wih different speed processors. I'd like to keep the fastest.Here's another source Z80 2.5 MHz Z80A 4.0 MHz Z80B 6.0 MHz Z80C 4.0 MHz CMOS Z80H 8.0 MHz I also saw something with Z?? 180 at the end which was, I think, faster still, or at least 8 HHz or more.
There actually was Z-180, Z-280, and Z-380. I seem to recall hearing of speeds up to at least 16 mhz.
The X80 series was supposed to be software compatible with the Z-80, but to have certain enhancments allowing for more memory and speed. Something along the line of the X86 series.
Roy