Author: Bruce D. Geelhood,

University of Washington, Seattle, WA

Operating System: Paper Tape

Source Language: PAL-III

Abstract: This is a revised and extended version of the double preci-

sion interpretive package submitted by Roger Anderson in 1968 (DECUS

8-115a). This package performs double precision signed integer arithmet-

ic operations using specially defined single word memory reference

instructions. The package is similar to the Floating Point Package

(DIG-8-5-S) but occupies much less core. Only two pages of memory and

15 words on page zero are required. This package performs the arithmetic

operations of addition, subtraction, multiplication, and division. It can

also jump in the interpretive mode, execute external subroutines, store

into core double precision, and perform several non-MRI operate com-

mands. The operate commands enable clearing, branching, negating. and

exiting. This extended version is superior to its predecessor in that it has

complete overflow protection, several operate instructions, and an easy

method of adding additional functions. In spite of these extensions the

new package occupies the same amount of memory.

Media Price Code: D2, F5, G12

Catalog: August 1978