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--- sd:appendix_4_instruction_set_architecture [2026/03/30 11:48] – appledog
+++ sd:appendix_4_instruction_set_architecture [2026/03/30 21:11] (current) – appledog
@@ Line 106: / Line 106: @@
 | | INT  | | Software interrupt | |
 | | RTI  | | Return from Interrupt | |
+=== MMU/Block Operations
+| 8C | MEMCOPY  | | Return from Interrupt | |
+| 8D | SCAN  | SCAN H, N | Scan ptr H for needle N | |
+| 8E | CMPC3 | CMPC3 ELM, FLD, C | Compare Characters | Z C |
+=== Bit Packing
+| 98 | PAB | PAB | Pack low 4 bytes of A and low 4 bytes of B into AL | |
+| 99 | UAB | UAB | Unpack AL into low 4 bytes of AL and low 4 bytes of BL | |
 === Flag Operations