I REALLY liked the structure of PDP-11 instructions. 3 bits were the mode
of the source, 3 bits for the source register, 3 bits for the mode of the
destination, and 3 bits for the register of the destination. The MSBs were
the instruction itself. By choosing the appropriate mode and register, you
could put things on a stack, do immediate values (literals on pics), do
indirect, direct, register, whatever you wanted. Really clever!

Harold


>> Although I have been wondering whether it would be worthwhile these
>> days to put an entire PDP11 or a small PDP10 into a microcontroller
>> style configuration (on board memory and peripherals.)  Probably not;
>> they may have had wonderfully elegant assembly languages, but the
>> processor core itself isn't too useful unless it runs one of the
>> popular operating systems as well...  (Hmm.  Did RT11 and RSX and such
>> get released the
>> way the pdp-10 software did?)
>
> That got me thinking and I found that you can find all you want about
> PDP-11 stuff at:
>     http://www.pdp11.org/
>
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