Real Time Display Processor for a KV8 Graphic System and

8-695

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)

Restrictions:
KW8 Model "E" clock assumed;

others may also work

Miscellaneous:
*C|ock only used by timer sub-

routines, not required for display

Source Language:
SABR

Catalog: July 1974

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)
Restrictions:	KW8 Model "E" clock assumed; others may also work
Miscellaneous:	*C\|ock only used by timer sub- routines, not required for display
Source Language:	SABR
Catalog:	July 1974