Privileged Instructions

Privileged instructions can only be executed in Supervisor Mode. This is indicated by a map index from 0 to 3. If a privileged instruction is executed in User Mode, an abort trap occurs.

Of interest, 56 - EAO and 57 - DAO are not privileged instructions, although they will enable or disable an abort trap on buffer overflows on the Big Number instructions.

The list of privileged instructions is:

Instruction byte	Opcode/Description
00	HLT
04	EI
05	DI
0A	RI
0E	DLY
0F	RSV
2E	Page Table
2F	DMA
76	EPE
86	DPE
96	SOP
A6	SEP
B6	ECK
C6	DCK
D7	SAR
E6	LAR
F6	LIO/SIO