| Function name | Opcode | Purpose |
| Dreadlabel() | 0x0152 | Read disk label |
| Dwritelabel() | 0x0153 | Write disk label |
| Dxreaddir() | 0x0142 | Extended Dreaddir() |
| Pgetauid() | 0x0145 | Get process' audit id |
| Pgetgroups() | 0x0147 | Get process' supplementary group ids |
| Pgetpriority() | 0x0158 | Get process' priority |
| Psetauid() | 0x0146 | Set process' audit id |
| Psetegid() | 0x0144 | Set process' effective group id |
| Pseteuid() | 0x0143 | Set process' effective user id |
| Psetgroups() | 0x0148 | Set process' supplementary group ids |
| Psetpriority() | 0x0159 | Set process' priority |
| Psetregid() | 0x014f | Set process' real and/or effective group id |
| Psetreuid() | 0x014e | Set process' real and/or effective user id |
| Psigintr() | 0x013e | Assign an interrupt to a signal |
| Scookie() | 0x014a | Cookie Jar management (obsolete). |
| Shutdown() | 0x0151 | Shut the system down |
| Ssystem() | 0x0154 | Control various system settings |
| Suptime() | 0x013f | Get system's uptime and load averages |
| Sync() | 0x0150 | Sync filesystems |
| Tadjtime() | 0x0157 | Adjust the clock (not implemented yet) |
| Talarm() | 0x0120 | Set SIGALRM delivery |
| Tgettimeofday() | 0x0155 | Interrogate the high resolution system clock |
| Tmalarm() | 0x013d | Set SIGALRM delivery |
| Tsetitimer() | 0x0149 | Set timer intervals |
| Tsettimeofday() | 0x0156 | Set the high resolution system clock |