PRINTER Control Byte
Advance the paper up to fifteen
single spaces, or selection of
Paper Tape Loop
Paper advance following next
Paper advance immediately.
Paper advance by 2 0 -22 count.
Paper advance by Paper Tape
Loop as selected by the 2 0 -22
Assuming the following bytes in memory:
The instructions: (Base Addresses implied)
1(1) , CTL1, CTL1
4(3) , CTL2, CTL2
3(1), CTL3, CTL3
Select Output Stacker #1 on the Card Reader
Unwind one gap on Magnetic Tape 3
Advance the paper on the printer two lines im-
An error condition that develops during the execution
of an I/O instruction does not halt the computer.
If the selected device is busy the instruction is
staticized until the device is available. I/O instruc-
tions set the Condition Code to one of three conditions.
If the device is inoperable, the instruction terminates
and the Condition Code is set to one (1). If the in-
struction has been accepted for execution by the Con-
trol Electronics, the Condition Code is set to zero
(0), and the normal mode is free to staticize the next
instruction in sequence. If an interrupt is pending
on a device, and an instruction selects that device,
the instruction terminates and the Condition Code
is set to (2).
If inter rupt is inhibited on an I/O channel, the
termination interrupt generated by the end of
a command using that channel, will be pending
and the channel will remain busy until a Post
Status Instruction resets the busy bit in the