HP 3000 III Series Manual page 332

Interrupt System
ENTERING PCAL
INSTRUCTION PORTION
OF MICROCODE
DETERMIN CST
TABLE USAGE.
(DETERMINE IF
CST OR XCST IS
TO BE USED.)
FETCH CST BASE
MASK OFF STT
OF PLABEL
VALIDATE CST
TABLE ENTRY.
SAVE A.M.R.T.
BITS OF CST FOR
LATER TEST
SET PB-BANK
SET PB It PL REG.
IF CODE SEG IS
ABSENT, REGISTERS
CONTAIN DISC ADRS.
FOR THE MOMENT
Figure 8-7.
SAVE "P" CALCULATED
IN THE P REGISTER
A· ABSENCE
M - MODE
R - REFERENCE
T- TRACE
THIS WILL FETCH AND
EXECUTE THE FIRST INST.
OF THE SOFTWARE INTERRUPT
RECEIVER'
Interrupt Handler Flowchart (Sheet 2 of 2)
8-26