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
| 5 | 4 | 3 | 2 | 1 | 0 |
|---|---|---|---|---|---|
| mode | regiſter | ||||
| 0 | 0 | 0 | Reg | ||
| 0 | 0 | 1 | Reg Defr | ||
| 0 | 1 | 0 | Auto+ | ||
| 0 | 1 | 1 | Auto+ Defr | ||
| 1 | 0 | 0 | Auto- | ||
| 1 | 0 | 1 | Auto- Defr | ||
| 1 | 1 | 0 | Inx | ||
| 1 | 1 | 1 | Inx Defr | ||
| 0 | 1 | 0 | 7 | Imdt | |
| 0 | 1 | 1 | 7 | Abs | |
| 1 | 1 | 0 | 7 | Rel | |
| 1 | 1 | 1 | 7 | Rel Defr | |
| 0 | 0 | 1 | 6 | Defr | |
| 0 | 1 | 0 | 6 | Auto+ | |
| 0 | 1 | 1 | 6 | Auto+ Defr | |
| 1 | 0 | 0 | 6 | Auto- | |
| 1 | 1 | 0 | 6 | Inx | |
| 1 | 1 | 1 | 6 | Inx Defr | |
|
Reg: Defr: Auto+: Auto-: Inx: Imdt: Abs: Rel: | |||||