Source register
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Source register (abbr. <sr>) is encoded in bits 5..3 of Register Operation (ROP) instructions.
The source registers are specified as follows:
| MAC mnemonic | Register name | Value | Octal value to add to ROP instruction |
|---|---|---|---|
| SD | D register | 1 | 108 |
| SP | Program counter | 2 | 208 |
| SB | B register | 3 | 308 |
| SL | L register | 4 | 408 |
| SA | A register | 5 | 508 |
| ST | T register | 6 | 608 |
| SX | X register | 7 | 708 |
If no source register is specified (value: 0), zero will be taken as the source register (i.e. the value 0 as input to operations).
References
- Norsk Data Document ND–06.014.02 ND-100 REFERENCE MANUAL Page 3-37
- Norsk Data Document ND–06.029.01 ND-110 Instruction Set Pages 39-40