: Keil (an ARM company) offers the industry-standard development toolchain for all 8051 derivatives. A free, code-limited evaluation version is directly accessible via the Keil Product Download Page.

Opening a new text instance and explicitly choosing Assembler Files as the document type.

ProView-32 was built for 16-bit and 32-bit legacy Windows operating systems (such as Windows 95, 98, NT, or XP).

: The industry standard for 8051 development, often bundled with Franklin Software's compilers in the past. Silicon Labs Basic Usage Guide

Their PC software typically allowed users to:

Before downloading ProView 32 (3.9), ensure that your system meets the minimum requirements:

Franklin Software's ProView 32 is a legacy Integrated Development Environment (IDE) specifically designed for developing and debugging code for the 8051 microcontroller Download and Availability