RCA Spectra 70 - Page 64

Input/Output Operation
7
I
No
Is the Specified Device
I
Control Electronics
Operable?
Set Condition Code to 3
I Yes
and Terminate Halt Device
8
Instruction
Receive Standard Device
t
Byte from Device
Next Instruction
1
Store Standard Devi ce Byte
in Multiplexor Channel
Registers in
SPM
1
Tell Device to Set an
End Condition
I
Reset Chain Command (CC)
Flag in CCR-II in Non-
Addressable Main Memory
9
I
Terminate Halt
Device Instruction
Next Instruction
Figure 6. Functional Logic of Halt Device Instruction (Cont'd)
55