A Programmer's Guide To The X-6 Assembly System.pdf

# A Programmer's Guide to the X-6 Assembly System

## Introduction
This guide provides a comprehensive overview for programmers preparing data processing programs for the X-6 assembly system on USS 80 or 90 Tape systems. It covers coding according to X-6 conventions, input deck preparation, and understanding the assembly process.

## General Description
After coding an object program, punched card input decks are prepared for the X-6 Assembly System. The guide details various card types (Label, Restrict, Tag Equals, Interlace, Tables, Specifications, Operation Header, Detail, and End-of-Run Sentinels) and their specific processing.

## Instruction Addressing
The X-6 system supports several addressing modes:

- Space Addressing: Direct access to storage locations.
- Tag Addressing: Uses tags (absolute or temporary) for indirect addressing.
- Overflow Addressing: Handles addresses exceeding the available space.
- Absolute Addressing: Direct referencing of memory locations.
- Register Addressing: Accesses processor registers.

## Latency Minimization and Library Routines
The guide also covers techniques to minimize latency, clock modification, and the use of library routines to enhance assembly efficiency.

## Assembly Input Cards
It outlines the structure of input decks, including:

- Symbolic Deck Organization: Grouping related cards.
- Input Card Format: Types 1 through 10 with specific fields and processing rules.

## Programming Procedures
The document offers guidance on:

- Flow-charting for program logic.
- Coding practices and conventions.
- Preparation steps for assembly, including error and stop code handling.
- X-6 storage layout information.