Posted By
JamesD
on 2017-02-15
19:37:21
|  Re: A mathematical demo
Ugh... huge mistake on my part.
The ez80 *is* binary compatible with the Z80/Z180.
It's the Rabbit that is only source code compatible.
Du-Oh!
*edit* I somehow deleted part of my reply. The other ez80 memory mode uses more than 16 bits for addresses, and it requires differences to the code, but I haven't used it, I've only used the HD64180.
I did a little reading on the Z280. It has a supervisor mode where the R800 does not.
I don't know if the R800 is a stripped down Z800 or if the Z280 is a souped up Z800.
So... if the ez80 is 30 times faster than a 4 MHz Z80... 30 x 4 = roughly the equivalent of a 120 MHz Z80.
I don't know what the comparison the pipelined Z80 cores I mentioned would be vs Z80, but since they are faster at the same speed, and can be clocked faster than 120 MHz in a custom ASIC, they must be faster than the ez80. But then there's no off the shelf part for them.
ARM, Coldfire, PowerPC, Spark, Arduino.... so many cheap microcontroller options with better compiler support than the old 8 bits.
*edit*
50 MHz ez80 CP/M system.
http://noplabs.com/cpm50/cpm50.html
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