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Microsoft BASIC for 6502
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MIT License
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Copyright (c) Microsoft Corporation.
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SOFTWARE
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README.md
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# Microsoft BASIC for 6502 Microprocessor - Version 1.1
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||||
|
||||
## Historical Significance
|
||||
|
||||
This assembly language source code represents one of the most historically significant pieces of software from the early personal computer era. It is the complete source code for **Microsoft BASIC Version 1.1 for the 6502 microprocessor**, originally developed and copyrighted by Microsoft in 1976-1978.
|
||||
|
||||
### Why This Document is Historically Important
|
||||
|
||||
#### 1. Foundation of the Personal Computer Revolution
|
||||
|
||||
- This BASIC interpreter was the software foundation that powered many of the most influential early personal computers
|
||||
- It democratized programming by making it accessible to non-technical users through a simple, English-like programming language
|
||||
- Without this software, the personal computer revolution might have developed very differently
|
||||
|
||||
#### 2. Microsoft's Early Success
|
||||
|
||||
- This represents some of Microsoft's earliest and most successful software
|
||||
- The licensing of this BASIC interpreter to multiple computer manufacturers was crucial to Microsoft's early business model
|
||||
- It established Microsoft as a dominant force in personal computer software before MS-DOS or Windows
|
||||
|
||||
#### 3. Multi-Platform Compatibility
|
||||
|
||||
- This single codebase was designed to run on multiple different computer systems of the era
|
||||
- The conditional compilation system allowed the same source code to target different hardware platforms
|
||||
- This approach influenced how software would be developed for decades to come
|
||||
|
||||
## Supported Computer Systems
|
||||
|
||||
The source code includes conditional compilation support for multiple pioneering computer systems:
|
||||
|
||||
- **Apple II** (`REALIO=4`) - Steve Jobs and Steve Wozniak's revolutionary home computer
|
||||
- **Commodore PET** (`REALIO=3`) - One of the first complete personal computers
|
||||
- **Ohio Scientific (OSI)** (`REALIO=2`) - Popular among hobbyists and schools
|
||||
- **MOS Technology KIM-1** (`REALIO=1`) - An influential single-board computer
|
||||
- **PDP-10 Simulation** (`REALIO=0`) - For development and testing purposes
|
||||
|
||||
## Technical Specifications
|
||||
|
||||
- **Language**: 6502 Assembly Language
|
||||
- **Target Processor**: MOS Technology 6502 8-bit microprocessor
|
||||
- **Memory Footprint**: 8KB ROM version
|
||||
- **Features**: Complete BASIC interpreter with floating-point arithmetic
|
||||
- **Architecture**: Designed for both ROM and RAM configurations
|
||||
|
||||
## Key Features
|
||||
|
||||
### Programming Language Support
|
||||
|
||||
- Full BASIC language implementation
|
||||
- Floating-point arithmetic
|
||||
- String handling and manipulation
|
||||
- Array support (both integer and string arrays)
|
||||
- Mathematical functions and operators
|
||||
- Input/output operations
|
||||
|
||||
### Memory Management
|
||||
|
||||
- Efficient memory utilization for 8-bit systems
|
||||
- String garbage collection
|
||||
- Dynamic variable storage
|
||||
- Stack-based expression evaluation
|
||||
|
||||
### Hardware Abstraction
|
||||
|
||||
- Configurable I/O routines for different computer systems
|
||||
- Terminal width adaptation
|
||||
- Character input/output abstraction
|
||||
- Optional disk storage support
|
||||
|
||||
## Development History
|
||||
|
||||
The source code includes detailed revision history showing active development:
|
||||
|
||||
- **July 27, 1978**: Fixed critical bugs in FOR loop variable handling and statement parsing
|
||||
- **July 1, 1978**: Memory optimization and garbage collection improvements
|
||||
- **March 9, 1978**: Enhanced string function capabilities
|
||||
- **February 25, 1978**: Input flag corrections and numeric precision improvements
|
||||
- **February 11, 1978**: Reserved word parsing enhancements
|
||||
- **January 24, 1978**: User-defined function improvements
|
||||
|
||||
## Cultural Impact
|
||||
|
||||
### Educational Influence
|
||||
|
||||
- This BASIC interpreter introduced millions of people to computer programming
|
||||
- It was the first programming language for countless programmers who later became industry leaders
|
||||
- The simple, interactive nature of BASIC made computers approachable for non-technical users
|
||||
|
||||
### Industry Standardization
|
||||
|
||||
- Microsoft's BASIC became the de facto standard for personal computer programming
|
||||
- The design patterns and conventions established here influenced later programming languages and development tools
|
||||
- The multi-platform approach pioneered techniques still used in modern software development
|
||||
|
||||
### Business Model Innovation
|
||||
|
||||
- The licensing of this software to multiple hardware manufacturers created Microsoft's early business model
|
||||
- It demonstrated the viability of software as a standalone business, separate from hardware
|
||||
- This approach became the template for the entire software industry
|
||||
|
||||
## Technical Innovation
|
||||
|
||||
### Compiler Technology
|
||||
|
||||
- Advanced macro system for code generation
|
||||
- Sophisticated conditional compilation for multi-platform support
|
||||
- Efficient symbol table management
|
||||
- Optimized code generation for memory-constrained systems
|
||||
|
||||
### Runtime System
|
||||
|
||||
- Stack-based expression evaluator
|
||||
- Dynamic memory management
|
||||
- Real-time garbage collection
|
||||
- Interactive command processing
|
||||
|
||||
## Legacy
|
||||
|
||||
This source code represents the foundation upon which the modern software industry was built. The techniques, patterns, and business models pioneered in this BASIC interpreter directly influenced:
|
||||
|
||||
- The development of MS-DOS and subsequent Microsoft operating systems
|
||||
- The standardization of programming language implementations
|
||||
- The establishment of software licensing as a business model
|
||||
- The democratization of computer programming
|
||||
|
||||
## File Information
|
||||
|
||||
- **Filename**: `m6502.asm`
|
||||
- **Lines of Code**: 6,955 lines
|
||||
- **Copyright**: Microsoft Corporation, 1976-1978
|
||||
- **Version**: 1.1
|
||||
- **Assembly Format**: Compatible with period assemblers for 6502 development
|
||||
|
||||
---
|
||||
|
||||
*This document represents a crucial piece of computing history - the source code that helped launch the personal computer revolution and established Microsoft as a software industry leader.*
|
||||
14
SECURITY.md
Normal file
14
SECURITY.md
Normal file
@@ -0,0 +1,14 @@
|
||||
<!-- BEGIN MICROSOFT SECURITY.MD V1.0.0 BLOCK -->
|
||||
|
||||
## Security
|
||||
|
||||
Microsoft takes the security of our software products and services seriously, which
|
||||
includes all source code repositories in our GitHub organizations.
|
||||
|
||||
**Please do not report security vulnerabilities through public GitHub issues.**
|
||||
|
||||
For security reporting information, locations, contact information, and policies,
|
||||
please review the latest guidance for Microsoft repositories at
|
||||
[https://aka.ms/SECURITY.md](https://aka.ms/SECURITY.md).
|
||||
|
||||
<!-- END MICROSOFT SECURITY.MD BLOCK -->
|
||||
Reference in New Issue
Block a user