DEC Opcodes vs Twaf

Dec Opcodes – DEC Architecture Reference Before the microprocessor, there was DEC. The minicomputers built by Digital Equipment Corporation didn't just advance computing - they defined it. Unix was born on a PDP-7. Spacewar! ran on a PDP-1. The field of Artificial Intelligence was born on the PDP-10. The VAX powered universities and research labs worldwide for a generation. DecOpcodes puts the complete instruction sets of these legendary machines in your pocket. Five iconic architectures covered: PDP-1 (1960) · PDP-8 (1965) · PDP-10 (1966) · PDP-11 (1970) · VAX (1977) For every instruction:  • Full description of what the instruction does  • Octal and hex encoding  • Flags affected  • Addressing modes, word count, and cycle counts  • Assembly code examples and implementation notes But there is a lot more than just dry opcodes:  • Complete system specifications and register architecture  • Historical context and cultural impact  • Archival photographs - front panels, system cabinets, and more  • Notable installations and the systems they powered  • Architecture variants and successors • Interactive lessons on assembly language and console operations (ideal if you have an PiDP emulator) Built for exploration:  • Search across all systems instantly • A simple assembler for PDP-1, -8 and -11 code • Filter by instruction category  • Sort alphabetically or by category • Favorite instructions for quick reference Beautifully designed:  • System-specific accent colours  • Five themes including Terminal green and Blinkenlights orange  • Full Dark Mode support From the 18-bit simplicity of the PDP-1 to the 32-bit sophistication of the VAX, DecOpcodes is a fascinating and interactive journey through the machines that made modern computing possible. All features are free and unlocked. If you like the app you can always leave a nice review or tip the developer!

Twaf is a daily companion for the Ge'ez calendar and the Orthodox Tewahedo tradition — for the Ethiopian and Eritrean diaspora, and for anyone walking this path of fasting and prayer. Know today's fast, automatically. Great Lent, Nineveh, Advent, Wednesdays and Fridays, and named fasts and feasts — computed from the Ge'ez calendar and Orthodox Easter. See the year on the Year Wheel — tap to explore fasting seasons and feasts. Pray by candlelight. Open a prayer and a twaf lights the page as you read — morning, midday, and evening. Follow Sunday readings in English, Tigrigna, and Amharic, with a focused reading view and opening and closing responses. Weekly readings refresh online when available from the readings service; an internet connection is needed for new readings. Keep today's calendar and fasting information close with the medium Home Screen widget. Meet the saints woven into your calendar through short, sourced profiles. Read Scripture, prepare for confession, and explore the Fasting Guide. Find a church. Browse Ethiopian and Eritrean congregations by city. Plan a wedding. Explore Saturdays and Sundays outside fasting periods. Switch between English, Tigrigna, and Amharic anytime. Core calendar and bundled prayer content are available offline. No account is required. Your saved preferences and private notes are stored on your device. Online readings and external links require network access. Dates are provided for reference. Please confirm observance-critical details with your parish priest.