PDP-11

[Bill (Smithville NJ)]

(10-28-2022 02:20 PM)KeithB Wrote:  You can do a PDP-8, too:
https://spectrum.ieee.org/put-the-classi...your-shelf

But I have trouble believing this line from the article:
"The PDP-8 had just eight machine-code instructions operating on 12-bit words,"

Just 8? I would think the math instructions would take more than that.

Here's a reference to the instruction set:

PDP-8 Instruction Set

Quote:

Quote:The PDP-8 instruction set is so small that many operations that are usually single instructions on a larger machine must be performed by instruction sequences on the PDP-8. While these are referred to as macros here, the memory resources of the PDP-8 are limited enough that these are usually not coded as given, but rather, carefully folded into other computations.

73
Bill WD9EQD
Smithville, NJ