Preliminary Specifications: Programmed Data Processor Model Three Part 8

MAINTENANCE ROUTINES

Maintenance Routines are used exclusively to check the operation of the machine. These routines are operated while varying the bias supply voltages, and thus a check is made on possible degradation of all components which would affect the operation of the machine.

MISCELLANEOUS ROUTINES

A variety of additional programs are provided with PDP-3.

One of the more important programs is the Typewriter Interrogator Program (TIP). TIP allows the typewriter to be used most effectively as an input-output link by which programs and data are examined and modified. The features include request for printing of a series of registers, interrogation and modification of the contents of registers, and the ability to request new tapes after programs have been suitably modified. Communication is done completely via the typewriter in either octal numbers, decimal numbers, or alphanumeric codes. Register contents are presented in similar form.

Other miscellaneous routines handle arithmetic processes, e.g., number conversions, and communication with the input or output devices. These routines include various format print outs, paper tape and magnetic tape read in programs, and display subroutines.

[Ill.u.s.tration: SYSTEM BLOCK DIAGRAM FIGURE 1]

[Ill.u.s.tration: INSTRUCTION FORMAT FIGURE 2]

[Ill.u.s.tration: FIGURE 3]