Control Data Cyber 170 State Hardware Reference Manual page 20

C M Characteristics
Central Memory
The CM has the following characteristics.
72-bit data word (60 data bits; 8 single-error correction, double-error
detection bits; and 4 unused bits).
2097K words ( 1 6 Mbytes) of dynamic random access memory; options available
to 167 76K words (128 Mbytes).
Organization of eight independent banks.
Two memory ports (located in the central processor cabinet).
Bounds register to limit write access.
6411s
clock period.
Maximum data transfer rate of one word every 32 ns.
4643s read access time.
384-8 readhite cycle time.
768-8 partial write cycle time.
Read and write data queuing capability.
Single-error correction, double-error detection (SECDED) on stored data.
Parity checking of all major data, address and control paths.
Unified extended memory (UEM), which serves as extended memory within CM.