Varian Data 620/i System Reference Manual page 152

Table H-1
Interrupt Module Reserved Instruction Codes
The following instruction codes are for use with the first interrupt module. Device
addresses 40
8
through 478 are reserved for interrupt modules.
Mnemonic
Octal
Function
A. Externa I Control
EXC 140* 100140
Clear AC Register
EXC 240 100240
Enable Interrupt Module
EXC 440
100440 Inhibit Interrupt Module
EXC 540
100540
Initial ize Interrupt Module
B. Transfer
OME 40
103040
Load Mask from Memory
OAR 40 103140
Load Mask from A Register
OBR 40
103240
Load Mask from B Reg ister
C. Sense
None
*AC option only
H-1