PDP-8s and -10s

Paul Koning pkoning at equallogic.com
Thu Jun 16 11:06:03 CDT 2005


>>>>> "Andy" == Andy Holt <andyh at andyh-rayleigh.freeserve.co.uk> writes:

 >> Gate count is not the issue.  Routing is.  The 6600 has an amazing
 >> design...

 Andy> Indeed ... weren't the 10 PPUs multiplexed through one
 Andy> arithmetic unit - a FPGA implementation would almost certainly
 Andy> find it simpler to have 10 non-multiplexed identical units
 Andy> (would up the gate count but simplify almost everything else).

Actually, that's unlikely to simplify matters, since it introduces
concurrency problems that don't exist in the real system.  Two PPUs
cannot do things "at the same time" in the real hardware...

       paul




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