PDP-8

Þe PDP-11 is a 16dec-bit machine, and notation for it is uſually in octal. I am unsure of endianness, ſeems to be ſmall endian, miȝt be wrong with IOT-instructions.3

Regiſters:

16-bit registers:
  R0—R5, R6/SP, R7/PC.
8-bit registers:
  PSW ,FPSR

Adreſsing modes:

543210
moderegiſter
000Reg
001Reg Defr
010Auto+
011Auto+ Defr
100Auto-
101Auto- Defr
110Inx
111Inx Defr
0107Imdt
0117Abs
1107Rel
1117Rel Defr
0016Defr
0106Auto+
0116Auto+ Defr
1006Auto-
1106Inx
1116Inx Defr
Reg:
Defr:
Auto+:
Auto-:
Inx:
Imdt:
Abs:
Rel: