A Laboratory and Real Time Patch With FNEW FOCAL
FOCAL 5/69
Author: G. Schayes and L. Zandarin,
Institut d'Astronomie et de Geophysique, Louvain-Ia-Neuve,
Source Language: PAL-III
Memory Required: 8K
Other Software Required: FOCAL 5/69 (DECUS No. FO-

Abstract: Allows laboratory experiments to be connected in real time
to the computer in FOCAL language. There are three main parts:
1) A FOCAL function FNEW is created having two independent
features: a) it allows PDP-8/E core memories to be read (or to
be written in) in FOCAL language; b) it allows to read in or to
output pulses on the DR8/EA 12 channel buffered digital I/O.
2) Pulses coming on this DR8/EA interface are creating a dynamic
interrupt of the inner program by executing the FOCAL group
15 instructions (equivalent to a "DO 15").
3) The KP8E Power Fail Detect option is used to save active
registers as AC, LINK and PC when a power low condition is
detected in order to restart the program at the interrupt point
when power is restored.

Media Price Code: D2, F5, G14
Catalog: August 1978