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2026

Why not everyone on the left thinks trans women in women’s sports is always a great ideaoriginal ↗
22 Sept 2026
PKLITE supplement 9: Min/max alloc. part 4original ↗
19 Aug 2026
PKLITE supplement 8: Min/max alloc. part 3original ↗
20 Jul 2026
The boy born on Tuesday puzzleoriginal ↗
11 Jun 2026
The universe is very, very fine-tunedoriginal ↗
25 May 2026
PKLITE supplement 7: Min/max alloc. part 2original ↗
24 Apr 2026
PKLITE supplement 6: Min/max alloc., part 1original ↗
5 Apr 2026
Spacemaker executable compressionoriginal ↗
23 Mar 2026
The easiest unsolved math problemoriginal ↗
24 Feb 2026
Details of Okumura’s LZSS compressionoriginal ↗
23 Jan 2026

2025

Notes on PFS:First Publisher ART formatoriginal ↗
29 Dec 2025
My two cents, rounded down, on penniesoriginal ↗
25 Nov 2025
The dates of earliest sunset and latest sunriseoriginal ↗
21 Oct 2025
Notes on CompuShoworiginal ↗
18 Sept 2025
Notes on ZIP format and disk spanningoriginal ↗
25 Aug 2025
The supernovas that get no respectoriginal ↗
22 Jul 2025
The “file” command: annotationsoriginal ↗
25 Jun 2025
The “file” command: binary and text filesoriginal ↗
22 May 2025
Notes on PKLITE, supplement 5: Another beta version foundoriginal ↗
11 Apr 2025
Classifying EXEPACK-compressed filesoriginal ↗
1 Mar 2025
Analyzing some encrypted ARJ archivesoriginal ↗
6 Feb 2025
MHD: A multi-file hex dump utilityoriginal ↗
23 Jan 2025

2024

The file command and black magic (Part 2)original ↗
22 Dec 2024
The file command and black magic (Part 1)original ↗
4 Nov 2024
Notes on PKLITE format, supplement 4: Polymorphic codeoriginal ↗
8 Oct 2024
Notes on PKZIP for Windows 3.xoriginal ↗
24 Sept 2024
A script to analyze magic patterns for the “file” commandoriginal ↗
26 Aug 2024
Notes on writing “magic” patterns for the “file” commandoriginal ↗
28 Jul 2024
Making an unsavable ColoRIX imageoriginal ↗
29 Jun 2024
What’s in an “_INST32I.EX_” file?original ↗
27 May 2024
Some notes on NP and NP-completenessoriginal ↗
28 Apr 2024
Survey of LZW compression schemesoriginal ↗
27 Mar 2024
The ground rules of chess problemsoriginal ↗
27 Feb 2024
Notes on bit orderoriginal ↗
28 Jan 2024

2023

64-bit BMP image filesoriginal ↗
29 Dec 2023
Making an uncompressed PNG image fileoriginal ↗
28 Nov 2023
DIET compressed EXE formatoriginal ↗
11 Nov 2023
Remember the 5th of Novemberoriginal ↗
5 Nov 2023
How big is a football field?original ↗
29 Oct 2023
How big is a light-year?original ↗
29 Oct 2023
The EXE checksum fieldoriginal ↗
27 Sept 2023
How DIET compression worksoriginal ↗
15 Aug 2023
Compiling lzhuf.c on a modern computeroriginal ↗
14 Aug 2023
Notes on PKLITE format, Supplement 3: Checksumoriginal ↗
18 Jul 2023
Fixing a hidden bug in PKZIP 2.04coriginal ↗
9 Jun 2023
Notes on PKLITE format, Part 7: v1.20 compressionoriginal ↗
11 May 2023
ColoRIX compressed 16-color formatoriginal ↗
28 Apr 2023
ColoRIX compressed image formatoriginal ↗
12 Apr 2023
Win32 I/O character encoding supplement 3: UTF-8 manifestoriginal ↗
25 Mar 2023
Updated survey of LHarc and LHAoriginal ↗
20 Feb 2023
Notes on SGI image formatoriginal ↗
30 Jan 2023

2022

Survey of EXPAND/DECOMP utilitiesoriginal ↗
27 Dec 2022
8 billionoriginal ↗
29 Nov 2022
Is faster-than-light communication possible?original ↗
26 Oct 2022
Notes on PKLITE format, Supplement 1: Descramblingoriginal ↗
11 Oct 2022
ARJ compression method 4original ↗
25 Sept 2022
Survey of RAR comment formatsoriginal ↗
19 Aug 2022
Which comes first in DOS timestamps, the date or the time?original ↗
26 Jul 2022
How to vote in a late-stage two-party systemoriginal ↗
26 Jul 2022
Notes on some old self-extracting ZIP archivesoriginal ↗
27 Jun 2022
Notes on PKLITE format, Part 6original ↗
9 May 2022
Notes on PKLITE format, Part 5original ↗
8 May 2022
What is LZSS compression?original ↗
22 Apr 2022
Survey of LHarc and LHA versions and namesoriginal ↗
27 Mar 2022
Notes on PKLITE format, Part 4original ↗
5 Mar 2022
Ambiguity of some infinite math expressionsoriginal ↗
23 Feb 2022
Notes on PKLITE format, Part 3original ↗
16 Jan 2022
Notes on PKLITE format, Part 2original ↗
13 Jan 2022

2021

Notes on PKLITE format, Part 1original ↗
19 Dec 2021
A quick overview of DOS EXE file formatoriginal ↗
11 Nov 2021
Testing some LZ77 compression limitsoriginal ↗
7 Oct 2021
Ways things can rotateoriginal ↗
28 Sept 2021
Differences between females and malesoriginal ↗
29 Aug 2021
The “guess what number I’m thinking of” problemoriginal ↗
28 Jul 2021
ARC/PAK’s “Distilled” compression schemeoriginal ↗
24 Jun 2021
ARC’s “Trimmed” compression schemeoriginal ↗
11 May 2021
Win32 I/O character encoding supplement 2 – setlocale enhancementoriginal ↗
8 May 2021
The Two Envelopes problemoriginal ↗
28 Apr 2021
Making an uncompressed JPEG 2000 fileoriginal ↗
22 Mar 2021
Yes, pi is wrong. Sorry about that.original ↗
11 Mar 2021
When a world needs a herooriginal ↗
4 Mar 2021
Formulas for “drop”original ↗
10 Feb 2021
Encoding Huffman codebooksoriginal ↗
24 Jan 2021

2020

Notes on LHARK compression formatoriginal ↗
24 Dec 2020
The Cleveland baseball teamoriginal ↗
22 Dec 2020
The blocksize field in LHA compression formatoriginal ↗
23 Nov 2020
Overview of some simple map projectionsoriginal ↗
29 Oct 2020
LZ77 compression prehistoryoriginal ↗
3 Sept 2020
An obscure polyglot file: LHA/CARoriginal ↗
26 Aug 2020
Earth portrait photosoriginal ↗
18 Jul 2020
Alternative to Cantor’s diagonalization argumentoriginal ↗
14 Jun 2020
Thoughts on timestamps of computer filesoriginal ↗
29 May 2020
Win32 I/O character encoding supplement 1 – A Cygwin issueoriginal ↗
6 May 2020
The recent discovery of an ancient bilaterian fossiloriginal ↗
9 Apr 2020
The World Chess Championship is kinda not so greatoriginal ↗
11 Mar 2020
PKZIP Implode bug #3original ↗
18 Feb 2020
Notes on WinHelp format, part 3original ↗
15 Feb 2020
Notes on WinHelp format, part 2original ↗
12 Feb 2020
Another Implode bug in old PKZIP softwareoriginal ↗
8 Feb 2020
Notes on WinHelp format, part 1original ↗
6 Feb 2020
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