Lamps Data Register (LDR)Similar to LAR, the Lamps Data Register (LDR) holds the DATA display reading.
LDR register is fed from the Lamps Bus (L-BUS) which is fed in turn from the selected register or memory (M) as the operator selects so in the Console.
When the machine is in normal program execution, if M is selected, LDR is updated for each memory read or write cycle. If a register is selected instead, LDR remains open passing to the Display the L-BUS content (that is, the selected register).
When the machine is halted, LDR is the destination of memory reading cycles made by the Console circuitry when the Operator examines memory content.
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