All posts

2026

2026-09-16: Apple Copland D11E4 booting in your Browser
2026-07-25: Final Cartridge III Calculator Easter Egg
2026-07-11: Commodore Disk Drive 1570/1571 Bedienungshandbuch [PDF]
2026-07-04: Commodore 128, das große BASIC-Buch [PDF]
2026-06-27: Commodore 128 Tips & Tricks [PDF]
2026-06-20: Das Trainingsbuch zu Textomat [PDF]
2026-06-13: Das Trainingsbuch zum SIMON’s BASIC [PDF]
2026-06-06: Das Statistikbuch zum Commodore 64 [PDF]
2026-05-30: Das Schulbuch zum Commodore 64 [PDF]
2026-05-23: Das Grafikbuch zum Commodore 64 [PDF]
2026-05-16: Das Commodore-64-Spiele-Buch [PDF]
2026-05-09: Das Nikolaus-Heusler-Archiv
2026-05-01: Running Adobe’s 1991 PostScript Interpreter in the Browser
2026-04-25: PacificPage P·E PostScript Cartridge for HP LaserJet II/III
2026-04-18: Lohnsteuerjahresausgleich? Einkommensteuererklärung? Mein C 64 hilft mir dabei! [PDF]
2026-04-15: Einführung in CAD mit dem Commodore 64 [PDF]
2026-04-04: Das große Drucker-Buch [PDF]
2026-03-30: Klaus Finke’s Commodore 64/128 GEOS Disk Collection

2025

2025-06-14: How the Final Cartridge III Freezer works
2025-05-25: 64 Tips & Tricks [PDF]
2025-05-08: 6502 Illegal Opcodes in the Siemens PC 100 Assembly Manual (1980)
2025-05-07: Siemens Personal Computer PC 100 Bedienungsanleitung, Ausgabe 1981/1982
2025-05-04: Brotkastenfreunde Interview
2025-04-06: Das Titelbild vom 64’er Sonderheft 2/85

2024

2024-03-20: 64’er Magazin – mit 40 Jahren Verzögerung jetzt monatlich im Web

2023

2023-07-21: Silo S01E06: 38911 BYTES FREE
2023-05-16: [Ankündigung] Vortrag “Apollo Guidance Computer” an der Embedded Computing Conference in Winterthur

2022

2022-12-26: The Easter Egg in the “Schrott-Tornado” at the Deutsches Museum
2022-12-25: darmok.com: Memes in the Tamarian Language
2022-12-24: PostScript Cartridge for HP LaserJet
2022-12-23: Scanntronik Manuals
2022-12-22: The Commodore AUTOMODEM (Model 1650)
2022-12-21: A 1960s Children’s Book about Computers
2022-11-19: Digitizing Analog Video through a Digital Camcorder
2022-11-18: Dissecting a Dummy Promo MiniDisc
2022-06-27: The Commodore VICMODEM (Model 1600)
2022-06-21: PostScript Cartridge Plus for HP LaserJet III
2022-03-20: CCGMS Future 0.2
2022-03-15: The Punter C1 Protocol
2022-03-07: UP9600: How to Bit-Bang 9600 Baud RS-232 on the C64
2022-03-05: The Commodore Modem/1200 (Model 1670)
2022-03-02: The Commodore Modem/300 (Model 1660)
2022-02-25: Announcing CCGMS Future 0.1
2022-02-02: Free Joystick Extension Cable to Build Your DB9 Competition Pro
2022-01-06: [UPDATE] Converting the “Competition Pro Extra USB” to C64/Amiga/Atari DB9

2021

2021-09-16: The Ultimate Commodore 1541 Disk Drive Talk [video]
2021-08-06: [Announcement] The Ultimate Commodore 1541 Disk Drive Talk @ VCFW 2021
2021-06-13: Commodore’s Assemblers: Part 5: 6502ASM
2021-06-06: Commodore’s Assemblers: Part 4: HCD65
2021-05-29: Commodore’s Assemblers: Part 3: BSO CY6502
2021-05-22: Commodore’s Assemblers: Part 2: MOS Resident Assembler
2021-05-15: Commodore’s Assemblers: Part 1: MOS Cross-Assembler
2021-05-09: Commodore’s Assemblers: Overview

2020

2020-11-23: Reverse-Engineered geoWrite 2.1 for C64 Source Code
2020-10-20: Diskettenlaufwerke am Beispiel der Commodore 1541 [video]
2020-10-10: Ankündigung: Vortrag “Diskettenlaufwerke am Beispiel der Commodore 1541″ am VCFB 2020
2020-09-24: Inside geoWrite – 9: Keyboard Handling
2020-09-22: Inside geoWrite – 8: Copy & Paste
2020-09-16: Inside geoWrite – 7: File Format and Pagination
2020-09-09: Inside geoWrite – 6: Localization
2020-09-06: Inside geoWrite – 5: Copy Protection
2020-09-04: Inside geoWrite – 4: Zero Page
2020-09-04: Inside geoWrite – 3: Font Management
2020-09-02: Inside geoWrite – 2: Screen Recovery
2020-09-01: Inside geoWrite – 1: The Overlay System
2020-08-22: CMDR-DOS: Commodore DOS on FAT32
2020-08-21: FAT32 Filesystem for the 65c02
2020-07-05: Building the Tynemouth Mini PET
2020-06-09: Ultimate Commodore Charset / PETSCII / Keyboard Reference
2020-06-03: Ultimate C64 KERNAL API Reference
2020-05-15: Ultimate C64 Memory Map
2020-05-10: Typos in the C64 Programmer’s Reference Guide: C3PO or C3P0?
2020-03-27: Dumping MiniDisc Media

2019

2019-12-30: The Ultimate Acorn Archimedes Talk [video]
2019-10-18: Commander X16: Philosophy and Specification
2019-08-11: NES and SNES Controllers on a 6502 (like the C64)
2019-08-04: The Apollo Guidance Computer [video + slides]
2019-05-29: Visualizing Commodore 1541 Disk Contents – Part 2: Errors
2019-05-28: Commodore “Video Supergame 64″ Bundle
2019-05-27: Dumping Commodore 64/1541 Disks with Errors
2019-05-26: Commodore “Magic Voice” Cartridge for C64
2019-05-25: Falk Rehwagen, TopDesk and GEOS
2019-05-24: TopDesk 1.3 GEOS64/128 Original Source
2019-05-23: Tynemouth Minstrel ZX80 Clone Kit
2019-05-22: Converting a Commodore 1541 or 1570 Drive into a 1551
2019-05-21: More Original Commodore Source Code
2019-05-20: Commodore Peripheral Bus: Part 5: TCBM
2019-05-19: Run CP/M on your C64 – using Emulation!
2019-05-18: C64 CP/M Cartridge
2019-05-17: Commodore Bildschirmtext II Decoder Cartridge
2019-05-16: Sinclair ZX81 Kit
2019-05-15: Blue Chip BCD/5.25 Disk Drive
2019-05-14: Recovering Files from Broken Amiga OFS Disks
2019-05-13: The Commodore IEEE-488 Cartridge for C64
2019-05-12: Final Cartridge III with GEOS
2019-05-11: Boxed MOS 6502 CPU
2019-05-10: Commodore MAX Machine
2019-05-09: Bildschirmtext-Demovideos von 1994
2019-05-07: Illegal Opcode Support for the Final Cartridge III Monitor
2019-05-06: Commodore Peripheral Bus: Part 4: Standard Serial
2019-05-05: GEOS Demo [GIF]
2019-05-05: The Commodore 8250 Dual Drive Floppy Disk
2019-05-03: Commodore 264 Series Preliminary Users Manual [PDF]
2019-05-02: Prototype Commodore 232 and 264 Computers
2019-05-01: Third Party Disk Drives for the C64: The “Technica”
2019-04-30: Das Maschinensprache-Buch zum Commodore 64 [PDF]
2019-04-29: Reconstructing the GEOS 2.0 (de) Master Images from a Pile of Broken Disks
2019-04-28: Building and Hacking on the C64 KERNAL & BASIC with Modern Tools
2019-04-27: A GEOS Speed Zone Bug? (Why Do C64 GEOS Boot Disks Break, Part 2)
2019-04-26: Why Do C64 GEOS Boot Disks Break? (Part 1)
2019-04-26: Reading the Raw Bits of a C64/1541 Disk without a Parallel Cable
2019-04-24: Making of the Book “Anatomy of the 4040 Disk Drive”
2019-04-24: Refilling a Commodore MPS 1550 C Ribbon Cartridge
2019-04-22: Fitting 44% More Data on a C64/1541 Floppy Disk
2019-04-21: The Ultimate Game Boy Talk [slides]
2019-04-20: Converting the “Competition Pro Extra USB” to C64/Amiga/Atari DB9
2019-04-20: Ultimate Commodore 64 BASIC & KERNAL ROM Disassembly
2019-04-19: Visualizing Commodore 1541 Disk Contents
2019-04-18: Building the Commodore TED Kernal with Modern Tools
2019-04-17: Building the Original Commodore 1541 DOS Source
2019-04-16: Book “Anatomy of the 4040 Disk Drive” by Hilaire Gagne
2019-04-15: Final Cartridge III Monitor for the TED
2019-04-14: C64 Keyboard Layout for the C16
2019-04-13: Analyzing the ROMs of Third Party Disk Drives for the C64
2019-04-12: Reconstructing the Unreleased C128 ROM Update
2019-04-11: Original Commodore Source Code Collection
2019-04-10: Commodore Peripheral Bus: Part 3: Commodore DOS
2019-04-02: Commodore Peripheral Bus: Part 2: Bus Arbitration, TALK/LISTEN
2019-03-26: Commodore Peripheral Bus: Part 1: IEEE-488
2019-03-19: Commodore Peripheral Bus: Overview
2019-03-10: Das neue Commodore 64 Intern Buch [PDF]

2018

2018-12-28: Announcement: The Ultimate Mars Rover Onboard Computer Talk
2018-12-11: Archiving C64 Tapes Correctly
2018-12-11: INPUT 64 Magazine Complete Archive
2018-12-04: Video of a Real C64 Defragmenting a Disk
2018-12-02: A Visual Defragmenter for the Commodore 64
2018-10-23: C64-Artikel in der c’t Retro 2018
2018-10-19: Repairing a Commodore 1084S Power Switch
2018-10-03: A Minimal C64 Datasette Program Loader
2018-07-05: Commodore 64 BASIC inside your USB Connector
2018-03-09: Making Of “Murdlok”, the new old adventure game for the C64
2018-02-20: Murdlok: A new old adventure game for the C64
2018-02-17: Commodore KERNAL History
2018-01-09: The Ultimate Apollo Guidance Computer Talk [video]

2017

2017-11-27: The Ultimate Apollo Guidance Computer Talk @ 34C3
2017-07-31: 62 Reverse-Engineered C64 Assembly Listings
2017-07-10: 80 Columns Text on the Commodore 64
2017-06-13: Building the Original Commodore 64 KERNAL Source
2017-01-06: The Ultimate Game Boy Talk [video]

2016

2016-12-07: Announcement: “The Ultimate Game Boy Talk” at 33C3
2016-08-19: Reverse-Engineered GEOS 2.0 for C64 Source Code
2016-08-09: Copy Protection Traps in GEOS for C64
2016-08-06: How Amica Paint protected tampering with its credits
2016-07-17: Why does PETSCII have upper case and lower case reversed?
2016-01-22: Macross 6502, an assembler for people who hate assembly language

2015

2015-06-09: xhyve – Lightweight Virtualization on OS X Based on bhyve
2015-04-14: Reconstructing Some Source of Microsoft BASIC for 8080
2015-03-10: Making Obsolete Code Run Again: The mxass 6502 Cross Assembler
2015-03-03: Emulating the Intel 8080 on a MOS 6502
2015-02-24: Converting VisAss and F8 AssBlaster Source
2015-02-17: Reverse-Engineered Final Cartridge III Source Code
2015-02-10: Source of “The Wave” Web Browser for C64/C128 GEOS Wheels
2015-02-03: geowrite2rtf, a GeoWrite to RTF converter
2015-01-27: Comparative C64 ROM Disassembly Study Guide
2015-01-20: Fully Commented Commodore 64 BASIC ROM Disassembly – based on Microsoft’s Source
2015-01-13: Microsoft BASIC for 6502 Original Source Code [1978]
2015-01-04: Using the OS X 10.10 Hypervisor Framework: A Simple DOS Emulator

2014

2014-12-29: Fully Commented Commodore 64 BASIC ROM Disassembly – based on Applesoft!
2014-12-20: Fully Commented Commodore 64 ROM Disassembly (English)
2014-12-15: Fully Commented Commodore 64 ROM Disassembly (German)
2014-12-08: Wikileaks Movie “The Fifth Estate” pirated my “Xbox Hacking” Slides
2014-12-01: Rhapsody Developer’s Guide [PDF, 1997]

2013

2013-03-28: Why is my TI-99/4A in Black and White?

2012

2012-02-06: Clockslide: How to waste an exact number of clock cycles on the 6502

2011

2011-10-13: Assembly Evolution Part 1: Accessing Memory and the strange case of the Intel 4004
2011-07-18: The story of 15 Second Copy for the C-64
2011-07-15: The story of FCopy for the C-64
2011-07-05: Chaosradio Express #177: Commodore 64
2011-06-28: Inside Commodore DOS [PDF]
2011-06-21: Racism in Monstropolis
2011-06-14: Gate A20
2011-06-07: Commodore 128 Programmer’s Reference Guide (PDF)
2011-05-30: SCUMM Script
2011-05-23: The Mansion – Technical Aspects
2011-05-18: Oops! I don’t have my CashCard here.
2011-05-10: Limitations in Maniac Mansion
2011-04-15: What Operating System Has Crashed Here?
2011-03-15: The Double Inverted Inconsistency Principle
2011-03-07: Leave security to security code. Or: Stop fixing bugs to make your software secure!
2011-02-07: A 256 Byte Autostart Fast Loader for the Commodore 64
2011-02-01: How many Commodore 64 computers were really sold?
2011-01-25: Commodore Plus/4, C116, C16 (TED) Technical Documents
2011-01-17: How to not get sued by Sony
2011-01-14: Final Cartridge III Undocumented Functions
2011-01-04: Reverse Engineering the MOS 6502 CPU [video]

2010

2010-12-26: Reverse Engineering the MOS 6502 CPU [announcement]
2010-12-02: Comparing BitTorrent Downloads of Interlaced TV Shows
2010-11-29: Comparing Digital Video Downloads of Interlaced TV Shows
2010-11-23: Xbox Serial Number Statistics
2010-11-18: Windows Phone 7 & the Floppy Disk
2010-11-16: The Intel 80376 – a Legacy-Free i386 (with a Twist!)
2010-11-14: Emu8080: an HTML5 App to Emulate a Complete CP/M Machine
2010-11-01: HFS+ File System Analysis and Forensics with fileXray
2010-10-27: For Lisa, the World Ended in 1995
2010-10-26: Name that Ware
2010-10-17: Standalone Commodore BASIC on the iPhone/iPad
2010-09-29: Internals of BRK/IRQ/NMI/RESET on a MOS 6502
2010-09-28: Measuring the ROR Bug in the Early MOS 6502
2010-09-26: Measuring the Entropy of the MOS 6502 CPU
2010-09-14: CPUID on all CPUs (HOWNOTTO)
2010-09-06: Playstation 3 Hacking – Linux Is Inevitable
2010-07-02: Why is there no CR1 – and why are control registers such a mess anyway?
2010-06-28: High-Res Pictures of a MOS KIM-1
2010-06-23: How much change is in a vending machine?
2010-05-24: Intel VT VMCS Layout
2010-05-04: Michael Steil rocks
2010-04-22: Microsoft vs. Standards
2010-04-20: Who invented the computer?
2010-04-09: Standards and Intellectual Property
2010-04-01: Buggy Drivers

2009

2009-12-29: Announcement: ‘libcpu’ Binary Translator
2009-11-22: Having Fun with Branch Delay Slots
2009-10-31: PCEPTPDPTE
2009-09-07: A Standalone printf() for Early Bootup
2009-09-01: Pictures of Apple Lisa 2 Boards
2009-08-24: TI-99/4A BASIC as a Scripting Language
2009-08-18: Amiga intern (PDF)
2009-08-11: Dangerous Xbox 360 Update Killing Homebrew
2009-08-10: Minimizing the Assembly needed for Machine Initialization
2009-08-04: Aggressive Tail Call Optimization
2009-07-28: LOAD”$”,8
2009-07-20: The Infinite Loop Mystery
2009-07-14: This is Copyright 1983 Microsoft – NOT!
2009-07-07: The Giant Pile of Money in My Office
2009-06-30: Apple Copland Reference Documentation
2009-06-23: Readable and Maintainable Bitfields in C
2009-06-16: A Lot of Security
2009-06-09: Stamp Vending Machine DoS
2009-06-02: Feed in Rogue Signal Here
2009-05-26: Apple Lisa Operating System Reference Manual (PDF, 1983)
2009-05-19: Tripos, the Roots of AmigaDOS
2009-05-12: Reverse-Engineering DOS 1.0 – Part 2: IBMBIO.COM
2009-05-07: Reverse-Engineering DOS 1.0 – Part 1: The Boot Sector
2009-05-05: The 6502 in “The Terminator”
2009-04-28: The History of OS Migration
2009-04-23: The Easiest Way to Reset an i386/x86_64 System
2009-04-21: LodgeNet Reverse Engineering
2009-04-13: Bringup History of Mac OS X
2009-04-07: cbmbasic 1.0 with Plugins
2009-04-06: Amiga/Lorraine Mugs
2009-04-03: Zuse Z1 at the Deutsches Technikmuseum
2009-01-31: Zuse Z3 at the Deutsches Museum
2009-01-25: Archimedes Operating System (PDF)
2009-01-15: Amiga & Supergrips
2009-01-12: The Ultimate Commodore 64 Talk: Pushing Keynote to its Limits

2008

2008-12-31: The Ultimate Commodore 64 Talk [video]
2008-12-15: The Ultimate Commodore 64 Talk @25C3
2008-12-06: Copland D9 Booting
2008-11-20: What Operating System Is This?
2008-11-18: Inside Macintosh Volumes I, II, III (PDF)
2008-11-04: Reconstructing the Leftovers on the Amiga Kickstart 1.0 Disk
2008-11-02: 64’er 04/1984 (PDF)
2008-10-28: Commodore BASIC as a Scripting Language for UNIX and Windows – now Open Source
2008-10-23: Transactor November 1987: Volume 8, Issue 3 (PDF)
2008-10-20: Create your own Version of Microsoft BASIC for 6502
2008-10-16: “ROR” in Microsoft BASIC for 6502
2008-10-15: Building the Solaris Kernel in 73 Easy Steps
2008-09-30: Bill Gates’ Personal Easter Eggs in 8 Bit BASIC
2008-09-05: The Xbox 360 Security System and its Weaknesses
2008-07-29: How MOS 6502 Illegal Opcodes really work
2008-07-18: Apple I BASIC as a Mac OS X Scripting Language
2008-07-15: Optimized Flags Code for 6502
2008-07-14: 1200 Baud Archeology: Reconstructing Apple I BASIC from a Cassette Tape
2008-06-30: Puzzle: 1200 Baud Archeology

2007

2007-12-12: Tool’s ‘Rosetta Stoned’ Live Performance to Include Apple I Schematic
2007-11-18: 64 bit is a lot!
2007-06-29: Game Development Archeology: Zelda on Game Boy comes with source
2007-02-06: Skype Reads Your BIOS and Motherboard Serial Number
2007-02-02: Switching modes with Style

2006

2006-11-09: How retiring segmentation in AMD64 long mode broke VMware
2006-09-03: Strange SSE3 opcodes
2006-08-13: How to divide fast by immediates
2006-08-07: Shift oddities
2006-08-03: Black Hat letdown
2006-08-02: Arithmetic mean of two signed integers
2006-07-31: Redundant SSE instructions
2006-07-26: How Itanium messed up Intel’s CPUID family IDs
2006-07-02: Win32’s MulDiv
2006-06-26: FFREEP – the assembly instruction that never existed
2006-06-16: Virtualization: The elegant way and the x86 way
2006-06-12: The funny page table terminology on AMD64
2006-06-07: The C ! operator
2006-06-04: The real reason for driver signing in Vista x64
2006-05-21: Microsoft changes CS value in Win64
2006-05-20: Simple compiler optimization
2006-05-10: Asking the kernel how to make a syscall
2006-04-17: Why does PUSHA also push the stack pointer?
2006-04-01: Puzzle: PowerPC Flag Simulation on x86
2006-03-18: How NOP nearly became a non-NOP on AMD64
2006-03-14: First assembly puzzle!