Real Time Display Processor for a KV8 Graphic System and
KW8 Clock

Terrence D. Lagerlund, Virginia Polytechnic Institute and
State University, Blacksburg, Virginia

This is a package of 10 subroutines For an 8K FORTRAN
system which allows FORTRAN or SABR programs to display
changing graphic data on a VT01 scope used in a non-storage
mode. The display processor performs the necessary refresh-
ing, using program interrupts, at the maximum speed of the
KV8 hardware. Provision is provided for displaying points,
lines, and circular arcs, For reading ioystick coordinates,
testing the joystick flag, reading characters From the teletype
and obtaining elapsed time from the real time clock, which
may be used to calculate coordinates as a Function of time.
Core required is five (5) pages.

Minimum Hardware:
PDP-8, TTY, KV8/VT01/H306;
KW8(E) Real Time Clock*
Other Programs Needed:
8K FORTRAN (Paper Tape,
PS/8 or OS/8)
KW8 Model "E" clock assumed;
others may also work
*C|ock only used by timer sub-
routines, not required for display
Source Language:

Catalog: July 1974