Varian Data 620/i System Reference Manual page 8

Specification
Type
Memory
Arithmetic
Table 1-1. DATA 620/i Specifications
Characteristics
General-purpose digital computer for on-I ine data system
applications. Magnetic core memory: binary, parallel,
single-address, with bus organization.
Magnetic core, 16 bits (18 bits optional); 1.8 micro-
seconds fu II-cycle, 700-nanosecond access time, 4096
words minimum, expandable in 4096-word modules to
32,768 words. Power-fai lure protection optional, non-
volatile. Thermal over-load protection is standard.
Parallel, binary, fixed point, 2
1
s complement.
Word Length
Speed (fetch and
execute)
Add or Subtract
16 bits standard; 18 bits optional.
3.6 microseconds.
Multiply (optional) 16 bits - 18.0 microseconds.
18 bits - 19.8 microseconds.
Divide (optional) 16 bits - 18.0fo25.2 microseconds.
18 bits - 19.8to28.8 microseconds.
Register Change
Input/Output
Registers
A Register
B Reg ister
X Register
1.8 microseconds.
From A or B register - 3.6 micro-
seconds.
From memory
seconds.
- 5.4 micro-
Accumulator, input/output, 16
or 18 bits.
Low-order accumulator, input/
output, index register, 16 or
18 bits.
Index register, multi-purpose
register, 16 or 18 bits.
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