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Summary Of Interrupt Logic - RCA Spectra 70 Training Manual

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SUMMARY OF 70/25 INTERRUPT LOGIC
Instruction
Op Code Trap
Store:
1.
CC in HSM 43
2.
Op Code in HSM 42
Arith. Overflow
Store CC
in
HSM 43
Interrupt
Indicator
Set?
Yes
I/O or
Op Code Trap?
Neither
Arithmetic
Overflow or
Elapsed Timer?
Transfer
to
Interrupt State
Identify Interrupt
(CC Setting) and
Process
Accordingly
STP2
Register
Return to Processing State
12
No
I/O
Instruction
Interrupt
"Pending!!
Interrupt
Inhibi ted By
Mask?
HSM 49
No
Yes
Store:
1.
CC in HSM 43
2.
TK
and
DV#
in HSM 47
3.
Stand.
DV.
Byte in HSM 48
Set CC
to
(00)2
r
HARDWARE
PROGRAMMING
1

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This manual is also suitable for:

Spectra 70/25