EXPO: A flexible PDP-8 Data-Acquisition Program

8-161

Bruce Arne Sherwood, California Institute of Technology,

Pasadena, California

EXPO is a PDP-8 program which reads various kinds of data

from experimental apparatus, optionally logs data on mag-

netic tape, and accumulates one - or two - dimensional

histograms of selected variables. These histograms may be

displayed on the Teletype or scope, simultaneously with data-

acquisition. From the keyboard the user defines what

variables are to be histogrammed and under what conditions;

variable names are symbolic and numerical parameters are

decimal. Also from the keyboard, the user may call for

Teletype or scope output with some control of format.

Because of its flexible user-oriented input-output, EXPO

has proven to be very useful in debugging and utilizing

complex apparatus in a high-energy physics experiment; it

is likely to be useful in similar experimental situations in

science or engineering. The write-up includes a useful

general discussion of interrupt handling on the PDP-8.

lvAiinimum Hardware: 4K PDP-8 with EAE, Magtape,

Scope display, and Plotter

optional

Source Language:
LRL Assembler (DECUS No. 5-13)

on cards

Storage Requirement:
0-7177 if all options used

Catalog: November 1969

Source Language:	LRL Assembler (DECUS No. 5-13) on cards
Storage Requirement:	0-7177 if all options used
Catalog:	November 1969