RCA Spectra 70 - Page 68

2
No
Set Condition Code to 3
and Terminate Check Channel 3
In structi on
Next Instruction
Yes
Set Condition Code to 1
and Terminate Check Channel
Instruction
Next Instruction
4
5
Start
Is Privileged Mode
Bit Set to Zero?
Yes
Is Specified Selector
Channel on System?
Is Specified Channel:
1. Busy Sel ector
2. Selector with Interrupt
Pending
3. Multiplexor in Burst
No
No
Set Condition Code to 0
and Terminate Check
Channel Instruction
Next Instruction
Yes
Figure 8. Functional Logic of Check Channel Instruction
59
Input/Output Opera.tim
Set Condition Code to 2
and Terminate Check
Channel Instruction
Next Instruction