Copyright (C) 2004-2009 by Anton Treuenfels

• License and Terms
• Contact Information
• Scope of This Document
• Related Resources
• Hardware and Software Requirements
• Executing HXA_T
• T_XX Processors
  • Instruction Set
  • Variants
• ASSUME Pseudo Opcode

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

Snail-mail:

• Anton Treuenfels
• 5248 Horizon Dr
• Fridley MN 55421

E-mail:

• hxa@earthlink.net

HXA is designed to be fairly portable between various processors.

This document describes the imaginary "T_XX" family of test processors and the portions of the HXA_T variant of HXA dependent upon them.

HXA_T is the assembler used for all general test and demonstration programs.

HXA

• Main Documentation

HXA_T

• General Tests : basic functionality tests
• General Demos : intermediate functionality tests
• Module Source : customization of HXA to create HXA_T

HXA for Windows

• Win 98SE or higher (through WinVista 64-bit)
• execute at Command Line Interface (MS-DOS prompt)

HXA for MS-DOS

• PC compatible (floating point unit used if available)
• 512 KB or more memory (extended or expanded memory used if available)
• MS-DOS 2.1 or higher

HXA_T accepts a single filename as a command-line argument:

HXA_T filename

There are no other command-line arguments, options or switches.

The "T_XX" family is an imaginary processor series created for the purpose of testing all the components of HXA which do not depend upon any particular processor.

"T_XX" processors currently share only two attributes with real processors:

• a program counter size (8- to 32-bits)
• a native byte ordering convention (MSB or LSB)

The "T_xx" family was created in 2004. Although primarily created to test HXA, this variant has also been used to assemble real processor instruction sets implemented as macro include files. Examples of these are found among the general demo programs.

None.

All variants of the "T_XX" family are distinguished by their names. Names take the form T_ PC_Width _ Native_Byte_Order .

• PC_Width is a two-digit decimal number in the range eight to 32 indicating the program counter size in bits
• Native_Byte_Order is either the character L (for a Least-significant-byte first processor) or M (for a Most-significant-byte first one)

Examples:

• T_08_L - 8-bit program counter, least significant byte first
• T_16_L - 16-bit program counter, least significant byte first
• T_32_M - 32-bit program counter, most sigificant byte first

HXA_T simply echoes every string given to it by the "ASSUME" pseudo op.

HXA_T also reports an error for any string which contains the substring " reject ".