The Lab

Powers-of-ten prefixes and a live Hz / kHz / MHz / GHz converter, plus clock period.

Landing page for the programmer's RPN calculator inspired by the HP-16C.

Hex / decimal / binary / octal at a fixed word size, with the signed two's-complement reading.

Resistor color-code calculator, RC time constant and cutoff, capacitor codes, and standard values.

Astable frequency and duty cycle, and monostable pulse width, from R and C.

Any two of V/I/R/P, plus a voltage divider and an LED series-resistor calculator.

Capacitive and inductive reactance, LC resonant frequency, and a series/parallel combiner.

AND/OR/XOR/NOT and shifts on two operands, in hex, decimal, and binary.

Decimal to and from 32-bit and 64-bit floats, with the sign/exponent/mantissa breakdown.

Bytes across KB/MB/GB (decimal) and KiB/MiB/GiB (binary), 1000 vs 1024.

Add, multiply, transpose, determinant, inverse, RREF, rank, trace, and powers.

Truth table to minimized Boolean expression, with the K-map, via Quine-McCluskey.

Caesar, Vigenère, XOR, and RC4 running live in the browser.

VGA, VESA, HDMI/CEA, analog NTSC/PAL/SECAM, and retro chip timings for FPGA video, with a counter calculator.

Cross-CPU emulator with a WOZMON-style monitor: 6502, Z80, 6809, 8080, and more sharing one 64K bus.

Assemble and single-step 6502 machine code right in the browser.

Paste hex bytes, get 6502 or Z80 assembly back.

Draw a C64 sprite (24×21) or character (8×8) and read out the data bytes.

All 56 instructions and 151 opcodes with addressing modes, bytes, cycles, and flags.

The Zilog Z80 instruction set by group with opcodes, bytes, T-states, and flags.

Editor commands, assembler directives, and the Super Snapshot 5 monitor for the on-hardware assembler.

The 16 VIC-II colors by number, with hex and RGB.

Memory blocks, zero-page, vectors, KERNAL jump table, BASIC/float routines, VIC-II and CIA registers.

The 6581/8580 register map, plus how the SID noise generator gives you random bytes.

Convert decimal to and from the 5-byte float the BASIC ROM uses.

Pack and unpack the $d011 / $d016 / $d018 control-register bits, both ways.

Blocks, zero-page, VIC 6560 registers, VIAs, and the KERNAL jump table.

Screen at $8000, PIA/VIA I/O, ROM layout, and the KERNAL jump table.

Decimal, hex, and character lookup.

Commodore 64 screen-code to character mapping.

Commodore BASIC tokens and PETSCII codes.

Keyboard cheatsheet for the VICE emulator.

Peek inside Atari ATR disk images in the browser.

Interactive plot of machine performance from 1960 to today.

Watch binary, octal, decimal, and hex roll over together.

Visualize how counter bits flip as a value increments.

Step a Fibonacci/Galois shift register, set taps, and watch the period. The SID's noise source.

Conway's Game of Life and the elementary 1D rules (30, 90, 110, 184).

Days left on the clock.

A small breathing-pace animation.

Interactive fretboard with scales, notes, and key-aware spelling.

Same fretboard tool, tuned for six strings.

Keyboard layout with scales and chord shapes.

Intervals, scales, and chord construction at a glance.

Drill note names and positions on the fretboard.

Equal-temperament pitches in Hz with the matching Commodore SID register values.