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Internal Function Drivers {10 drivers, IFD, A)
These drivers can activate special control functions. These functions are listed under "Special
Instructions" as the Drive Internal Function (DIF) instructions.
Internal Status Lines {10 lines, ISL, A)
These lines are used to test the status of various special conditions. These conditions are
listed under "Special Instructions" as the AND Internal Status (NIS) instructions.
THE MEMORY UNIT
M-Register {18 bits, no abb., N)
The M-register is the memory output register. References to Min many places in this manual
refer to the contents of a memory location, which is actually made available in the M-register.
In the step/stop mode, the register will contain the contents of the last memory location accessed
as specified by L.
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 (14 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 all buffer units on the buffer selector.
Transmit Data Drivers (21 drivers, T, A)
These drivers are used to send data to all buffer units on the buffer selector.
External ]function Drivers (10 drivers, EFD,
A)
These drivers are used to send control signals to a buffer unit. The function of each driver
depends on the particular type of buffer unit. The functions are listed under "Buffer Selector
Instructions" as the DEF instructions.
@&11&~~11c:J ~@------------
I-14
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