such as relocation and the BDP instructions.

Memory

All 3000 series computers use magnetic-core memory. The CDC 3500 machine use the same core memory modules as used in the CDC 6000 / Cyber 70 series computers.

Architecture

The lower 3000 CPU uses a 24-bit architecture: instructions are 24 bits in length, as are the two operand registers A and Q. There are four index registers of 15 bits, B0 through B3, though B0 is always zero (zero when read; writes do not

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