Geometry vs Opcodes

With Geometry: Constructions Tutor learn to make constructions with compass, pencil and straightedge. Learn constructions by watching animated demonstrations. Switch to the practice mode and make a construction yourself to test your knowledge and understanding. The application will check the construction when you’re done and tell you if you’re correct. Let the program confirm your constructions and build your confidence! Smart objects snapping, automatic detection of objects intersections, a unique single touch compass, pinch-to-zoom, and an above-the-finger magnifying glass will make even a complex construction feel easy. There’s no need to use clumsy real world geometric tools and waste one sheet of paper after another to get a perfect result. Make all constructions with just one finger. Every action can be undone and you can restart at any moment. There is no need to aim. Smart snapping will do the job for you. Focus on learning and test your real knowledge, not your motor skills! Watch demos of constructions and practice making: - Lines: copy of a segment, perpendicular bisector, division of a segment into equal parts, perpendicular line through a point on a line, perpendicular line through an external point, parallel line through a point. - Angles: copy of an angle, angle bisector, 30, 45, 60, and 90 degree angles. - Triangles: triangle given three sides, triangle given one side and two adjacent angles, triangle given two sides and included angle, copy of a triangle, equilateral triangle, isosceles triangle, 30-60-90 triangle, median lines. - Triangles & Circles: incenter, circumcenter, incircle, circumcircle. - Circles: center of a circle, tangent lines through an external point, tangent line through a point on a circle, circle through any given three points, foci of an ellipse. - Polygons: hexagon given one side, hexagon inscribed into a circle, pentagon inscribed into a circle.

Opcodes – The Retro CPU Reference The definitive opcode reference for the legendary processors that launched the personal computer revolution. Whether you're a retrocomputing enthusiast, a student of computer history, writing code for classic hardware, or just a big old nerd - the Opcodes app gives you everything you need. Eighteen iconic processors covered: Intel 4004 · Intel 8008 · Intel 8080 · Intel 8085 · Intel 8088 · Zilog Z80 · Motorola 6800 · Intel 8085 · Motorola 6809 · MOS 6502 · Signetics 2650 · RCA 1802 - SC/MP · Motorola 68000 · Intel 8086 · WDC 65816 · Texas Instruments TMS9900 · INMOS Transputer · ARM2 For every opcode:  • Full description of what the instruction does. • Hex, octal, and decimal values. • Flags affected. • Addressing modes and cycle counts. • Assembly code examples - including loops, conditionals, and common patterns. More than just opcodes:  • CPU history and historical context. • IC pinout diagrams. • Notable systems that used each CPU, with memory maps and other background information. • Chip variants and successors. • A silly card game(!) • Simple assembler / disassembler for many CPUs. Built for exploration:  • Search for opcodes by name or category. • Sort by mnemonic, opcode byte, or category. • Filter by category, Quick Find with a colorful map. • Undocumented instructions clearly marked and optionally displayed. More than microprocessors:  • Information on key support chips: video, sound, memory and more. Cool design:  • Clean, readable layout optimised for quick reference. • Multiple colour themes. • Full "dark mode" support. Everything is included with absolutely no in-app purchase required. Recent additions: • Quiz game - test your CPU knowledge! • Share CPU cards - beautiful shareable images showing specs and history for any processor • External references - curated links to community resources for all 18 CPUs • "Opcodes display first" setting - choose whether selecting a CPU shows opcodes or info first • Chip-maker colour themes - Zilog, MOS Tech, and Motorola replace the old themes • Enhanced 6502 docs - JMP page boundary bug, BRK behaviour, and Read-Modify-Write quirks • Fixed Scratchpad hang when switching tabs