Editor and Assembler for 57A Magnetic Tape System
8-180

Donald C. Uber, Lawrence Radiation Laboratory, Livermore,
California

The symbolic Editor and MACRO-8 Assembler have been
modified to replace paper tape with IBM-compatible magnetic
tape for more rapid and convenient program development.
The system requires an 8K PDP-8 and a 57A Tape Control
with one transport.

The Editor reads and writes ASCII text in a file on magnetic
tape. Text is stored in "pages" which may be individually
accessed by Teletype commands. All the original operations
are retained, including paper tape I/O.

MACRO-8 assembles the text file, completing all three passes
before halting. Binary output is on high or low speed paper
tape. The symbol table and Pass 3 listing may be on Teletype
or written in a second tape file for listing on a line printer.

A third program moves pages of text from one area of tape
to another whenever re-editing and re-assembly are
necessary.

Minimum Hardware:
PDP-8, 8K memory, ASR-33,
57A Magnetic Tape Control with
one transport.

Other Programs Needed:
Symbolic Editor (DEC-08-ESAB)
High-Speed MACRO-8 (DEC-8-8-
S)

Storage Requirement:
Fields 0 and 1; locations 0-7577

Source Language:
MACRO-8

Restrictions:
The 57A needs modification for
Extended Memory operations.

Catalog: November 1969