Robert Berger, Bell Telephone Laboratories, New York,

New York

One problem with programs written in Program Assembly

Language (PAL) for operation on a PDP-5/8 computer is the

danger of an untested program being self-destructive,

running wild, destroying other programs residing in memory

such as loading programs. PALEX prevents any of the above

unwanted operations from occuring while it gives the operator

programmer valuable debugging information and enables him

to make changes in his program and tryout the modified

program. Once running, PALEX cannot be destroyed by any

program or instruction in memory, the operator need not touch

any manual console controls, and all required information is

printed in easy-to-read format on the Teletype console.