DAdavidfekke·Sep 2, 2026
Here is the 6502 assembly source code for Microsoft Basic:
https://github.com/microsoft/BASIC-M6502
In Altair Basic Interpreter Source Code (1975) [pdf]microsoft
BASIC-M6502
Assembly2025–2026
microsoft / BASIC-M6502 · Archived
BASIC-M6502
Microsoft BASIC for 6502 Microprocessor - Version 1.1
11Distinct people
11Mentions
0Explicit recommenders
4.5KGitHub stars
What to know before exploring
What it is
Microsoft BASIC for 6502 Microprocessor - Version 1.1
GitHub
Where it is used
No documented product use has been verified yet.
What people are saying
No recommendation phrase was found in the indexed comments.
No classified warning is attached to this page. Read the discussions before treating silence as approval.
Also in these discussions
No other repository is repeatedly linked in the same discussions.
This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 12:54:37 PM UTC.
No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.
Mentions over time
HN mentions by month11 dated mentions
Observed mentions: 2025-09-03 16:29:59 UTC to 2026-09-02 21:29:21 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| Sep 2025 | 2025-09-01 00:00:00 UTC | 2025-10-01 00:00:00 UTC | 8 | 1 | 7 |
| Oct 2025 | 2025-10-01 00:00:00 UTC | 2025-11-01 00:00:00 UTC | 1 | 0 | 1 |
| Nov 2025 | 2025-11-01 00:00:00 UTC | 2025-12-01 00:00:00 UTC | 0 | 0 | 0 |
| Dec 2025 | 2025-12-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 0 | 0 | 0 |
| Jan 2026 | 2026-01-01 00:00:00 UTC | 2026-02-01 00:00:00 UTC | 0 | 0 | 0 |
| Feb 2026 | 2026-02-01 00:00:00 UTC | 2026-03-01 00:00:00 UTC | 0 | 0 | 0 |
| Mar 2026 | 2026-03-01 00:00:00 UTC | 2026-04-01 00:00:00 UTC | 0 | 0 | 0 |
| Apr 2026 | 2026-04-01 00:00:00 UTC | 2026-05-01 00:00:00 UTC | 0 | 0 | 0 |
| May 2026 | 2026-05-01 00:00:00 UTC | 2026-06-01 00:00:00 UTC | 1 | 0 | 1 |
| Jun 2026 | 2026-06-01 00:00:00 UTC | 2026-07-01 00:00:00 UTC | 0 | 0 | 0 |
| Jul 2026 | 2026-07-01 00:00:00 UTC | 2026-08-01 00:00:00 UTC | 0 | 0 | 0 |
| Aug 2026 | 2026-08-01 00:00:00 UTC | 2026-09-01 00:00:00 UTC | 0 | 0 | 0 |
| Sep 2026 | 2026-09-01 00:00:00 UTC | 2026-10-01 00:00:00 UTC | 1 | 0 | 1 |
What Hacker News says
11 sourcesEven the README here is (erroneously?) timestamped as 1978 https://github.com/microsoft/BASIC-M6502
Which is unlikely since it seems to be written by AI
In Microsoft open-sources “the earliest DOS source code discovered to date”Repo in question: https://github.com/microsoft/BASIC-M6502
In Microsoft's first-ever programming language was just open-sourcedThose are all disassemblies, not the original code (although the original code for 6809 BASIC was recently found, see https://github.com/davidlinsley/DragonBasic). Similarly, the blog post links a version of 6502 BASIC by Michael Steil on Github that's set up to build the BASIC ROMs for a variety of computers, but that appears to be based on a disassembly rather than the original code as well. Here's a random bit of code (the code handling processing a FOR statement) from Microsoft's repo, vs. the same code from Steil's repo: https://github.com/microsoft/BASIC-M6502/blob/main/m6502.asm... https://github.com/mist64/msbasic/blob/master/flow1.s#L3
In Microsoft BASIC for 6502 Microprocessor – Version 1.1Speaking about .gitignore. What is this?
# MightyMoose
*.mm.*
I could only find this: https://github.com/MonzUn/MightyMooseCore
Link to the file: https://github.com/microsoft/BASIC-M6502/blob/main/.gitignor...
Regardless, thank you Mr. Hanselman. This is great!
In Microsoft BASIC for 6502 Microprocessor – Version 1.1Love the comments:
"7/27/78 FIXED BUG WHERE FOR VARIABLE AT BYTE FF MATCHED RETURN SEARCHING
FOR GOSUB ENTRY ON STACK IN FNDFOR CALL BY CHANGING STA FORPNT
TO STA FORPNT+1. THIS IS A SERIOUS BUG IN ALL VERSIONS."
Not far off from a comment I might make these days
https://github.com/microsoft/BASIC-M6502/blob/main/m6502.asm...
In Microsoft BASIC for 6502 Microprocessor – Version 1.1If you love that, check out the auto/AI generated issues:
https://github.com/microsoft/BASIC-M6502/issues/5
https://github.com/microsoft/BASIC-M6502/issues/3
https://github.com/microsoft/BASIC-M6502/issues/1
In Microsoft BASIC for 6502 Microprocessor – Version 1.1https://github.com/microsoft/BASIC-M6502/blob/main/m6502.asm...
RETURN: BNE GORTS ;NO TERMINATOR=BLOW HIM UP.
In Microsoft BASIC for 6502 Microprocessor – Version 1.1Microsoft BASIC for 6502 Microprocessor – Version 1.1
290 points · Open discussionDefinitely nice to see this as an official release from MS.
https://github.com/microsoft/BASIC-M6502
In Microsoft BASIC for 6502 Microprocessor – Version 1.1