mrandish on A brief tour of the PDP-11, the most influential minicomputer of all time (2022)

Comment on A brief tour of the PDP-11, the most influential minicomputer of all time (2022)parent

It had a very clean and symmetric instruction set

Indeed. Motorola's 68000 CPU took so much inspiration from the PDP-11's ISA, it was almost a spiritual successor. The 68000's 8/16-bit little brother, the 6809, widely considered the most powerful 8-bit CPU ever - was also heavily inspired by the PDP-11.

tralarpa 2mo

Somes lines in PDP-11 assembly from 2.11BSD:

  mov r1,-(sp)
  mov $1024.,-(sp)
  mov $outbuf,-(sp)
  mov fout,-(sp)
  jsr pc,_write
  add $6,sp
  mov (sp)+,r1
  tst r0
  bpl 2f
  jmp wrterr

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