Your first computer

// Your first computer: a CPU built from NAND gates, running a program.
//
// Press Run, then click RESET to set it to 0. The CPU starts at address 0 of
// the program ROM and the terminal prints what it sends.
//
//   step clock   200 ticks a second; set its mode to step to go one
//                instruction a click
//   RESET        at 1, the next tick sets the program counter to 0
//   program ROM  click it: the program is Kestrel assembly in its properties
//   KESTREL      the CPU, one chip; Unpack it to see CONTROL, REGS4, ALU8,
//                RAM8 and PC, and keep unpacking down to the NAND gates
//   terminal     prints each byte OUT sends it
//
// The Kestrel has four registers, R0 to R3, eight bytes of RAM and sixteen
// instructions. The help article on the program ROM lists them. Change the
// program, press Run and RESET again, and it runs yours.
//
// Every chip in it is built in the lessons on the path From gates to a
// computer, under Learn.