Signed Decimal Print, Single Precision

Summary

This document provides technical documentation for a subroutine designed for the PDP-8 computer. The subroutine's primary function is to output the contents of a computer word as a signed, four-digit decimal integer. It interprets binary numbers stored in two's complement format: if the number is negative, it prints a minus sign; if positive, it prints a space.

Key details include:

• Requirements: The subroutine occupies 51 core memory locations and is intended for use with a basic PDP-8 system equipped with an ASR-33 teletype.
• Usage: It is invoked using the "JMS" instruction. The subroutine does not preserve the contents of the Accumulator (AC) or the Link register upon return.
• Implementation: The document includes the assembly source code (in PAL III or MACRO-8 format), a detailed flowchart, and a test program to verify its operation.
• Dependencies: The method relies on power-of-ten conversion logic, with references to other Digital-8 library subroutines for related formatting tasks (like carriage returns or tabulations).