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Internal Status Lines (10 lines, ISL, A)
These lines are used to test the status of various special conditions.
THE MEMORY UNIT
M Register (18 bits, no abb., N)
The M register is the memory output register. References to M in many places in this manual
refer to the contents of a memory location, which is actually made available in the M register.
Memory Drivers (18 drivers, no abb., N)
The memory drivers are used to write a new word into the memory and to regenerate a word when
it
is read out of the memory.
Memory Address Lines (15 lines, no abb., N)
These contain the address of the memory location being accessed.
THE BUFFER SELECTOR
Receive Data Lines (21 lines, R, A)
These lines are used to receive data from a buffer channel.
Transmit Data Drivers (21 drivers, T, A)
These drivers are used to send data to a buffer channel.
External Function Drivers (10 drivers, EFD, A)
These drivers are used to send control signals to a buffer channel. The function of each driver
depends on the particular type of buff er.
External Status Lines (10 lines, ESL, A)
These lines are used to test various conditions in a buffer channel. The condition tested by each
line depends on the particular buffer.
Buffer Address Decode (128, N)
This unit decodes the C register into a 1 out of 128 signal to select the desired buffer address.
rID&iT&~~lY~ ~®------------
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