A Guide to the IBM System/370 Model 155
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This routine is the Interrupt Service Routine performed by the card in response to a Receive character interrupt from the UART. This routine services one
Setting this bit will cause a channel initiated sequence to be answered by the DX11 with a Control Unit Busy Sequence.. This bit causes the BSY bit to assert to
Telegraph Type Input-Output (Output Buffer off line. Status) Power off2. Local telegraph unit is not
Seven rows of lights indicate: assembly register, command counter, address counter, word counter, con- trol counter, assembly ring, character ring, operation register,
If an I/O device is addressed and the I/O device is executing a previously initiated operation, or a control unit to which it is attached is busy or has status
these control units is used to provide the CPU interlock control for changing the enable/disable states of the units (the signal must be down to
If character phase is established and a control character such as SOH or STX is received, the line attachment sets adprep monitor mode and text mode but does
drastically by the use of high-speed buffer storage, which eliminates CPU to processor storage fetches for approximately 95% of the fetches required. The
