Re:What is the PDP-11 instruction set?
by mikequinlan on Sunday October 18, 2020 @04:11PM
(#24820729)
Is somebody going to do this for the PDP-10? My first programming experience was on the PDP-10 and I loved how symmetrical the instruction set was. Of course a maximum user address space of 256K 36-bit words would never fly nowadays, but for the time it seemed awesome.
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Re:What is the PDP-11 instruction set?
by codesmythe on Sunday October 18, 2020 @04:31PM
(#24820901)
Checkout http://pdp10.nocrew.org/docs/instruction-set/pdp-10.html for detailed info on the PDP-10 instruction set
Get the Panda Tops-20 distribution for the Ka10.
Then find either an assembler or use the debugger.
The final KL10B permitted up to 32 256K word sections.
Re:What is the PDP-11 instruction set?
by mikequinlan on Monday October 19, 2020 @10:06AM
(#24826469)
I am curious, do you know if user-mode programs had access to more than a single 256K word address space? Did they add something like segment registers or a split between Data and Instruction space?
The answer is yes they did. I think the PC was extended and you switched explicitly between segments via a small set of instructions, so code/data can't span segments. I think of it as being like an overlay system without actually overlaying.