IBM 770 manual Performance Specifications, System Overview

Specifications

Figure 1-4 to Figure 1-7 on page 1-9 list the specifications for the computers.

Performance Specifications

Device/Cycle						Clock	Counts
						(66	MHz)
Microprocessor						200	or		233
L1 cache		(64bit)				MHz
read/write hit						1	CPUCLK
L2 cache (64bit) (for					not all
models)						90	ns	(60		ns)
read hit (back-to-back)						90	ns	(60		ns)
write hit (back-to-back)
Memory	(64bit)		(see	Note)
read,	page		hit			240		ns
read,	raw	miss				285	ns
read,	page		miss			345		ns
posted write						90	ns
write	retire		rate	from		135		ns
write buffer
Note:
The cycle times shown for							access			to	system
board	RAM	are based on				70		ns	EDO	memory.

Figure 1-4. Performance Specifications

System Overview 1-7