DOS · Free download · Assembly Language
AS65v1.30
is an assembler for the 6502 and 65SC02 microprocessors.
- Operating system
- DOS
- File size
- 51 KB
- License
- Freeware
- Last updated
- Apr 28, 2026
371 downloads·1039 page views
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Overview
What is AS65?
is an assembler for the 6502 and 65SC02 microprocessors.
In depth
A closer look at AS65
It reads input from an ASCII text file, assembles this into memory, and then writes a listing and a binary or hex file.
Features of AS65 include: fast two-pass assembly; support for binary, s-records or intel-hex output file formats; optional generation of a debug information file; three segments (code, data, bss) for ROM-based programs; a 'struct' keyword for easy declarations; an instruction cycle count in the listing; full conditional assembly with CPU identifying defines; C-style expressions; support for long file names when running in a Windows DOS box; and full macro capability.
It accepts 65SC02 instruction set extensions to the 6502. This can be enabled from the commandline using -x option.
AS65 runs under MS-DOS 3.x+ or compatible systems.
Verdict
Should you download AS65?
AS65 runs on DOS and is available under the Freeware license — the installer is 51 KB. We’ve catalogued it under Assembly Language.
Verified clean. Every AS65 build on SoftLookup is scanned for viruses, spyware, adware, trojans and backdoors. We re-test on every update.
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At a glance
AS65 specifications
- Category
- Assembly Language
- Publisher
- Frank Vorstenbosch
- Last updated
- Apr 28, 2026
- License
- Freeware
- Operating system
- DOS
- File size
- 51 KB
- Price
- Free
- Page views
- 1039
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