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