> In addition to the recent "CPU discussion", I want to point at the
AB180-20
> microprocessor made by AB-Semicon.
>
> Features:
> * Z80, Z180 compatible
So is Z380.
> * 20MHz, 20 MIPS
Z180: 33MHz, don't know about MIPS.
> * 1MB memory, 64k I/O
Same on Z180. The Z80 already had 64k I/O, when using OUT (C),r or IN A,(n).
So that's nothing new either. And it's certainly not useful, because to
remain compatible with the architecture of the MSX, we can only use 265 of
the existing 64k I/O ports.
> * two 16-bit timers
Z180 has even got an entire RS232 interface built into it!!!
> * MMU
Don't know about that...
> * add. instructions: TST TSTIO MLT
Already there on Z180.
> The AB181E-20 microprocessor has an additional fixed math accelerator.
> Anyone familiar with this CPU? Could this be a third alternative?
No. Then you could as well use the Z180, which is almost the same, and runs
at a higher (clock) speed.
It was a nice suggestion though.
~Grauw
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