The calibration cart

One cartridge of our own, whose every screen is built to be measured: off a console through the scope, the grabber and a camera, and off the model through the same decoder, with one tool reading all of them. This section holds the plan, the tutorial that builds the ROM and puts it on a board, the screens as pictures, the blank boards, the record of the build as it goes, and the console's lockout chip, which a cartridge without one has to get past. The ROM and its manifest are served here too: cal.nes and cal.json, the same bytes the checksums in the tutorial name.

Planning the calibration cartridge	One cartridge whose every screen is built to be measured off the real console and the model through the same reader, each frame naming itself; colour, resolution, filtering and the pad.
Building the calibration cart	From the idea of a frame that names itself, through a cartridge written with a sixty-line assembler, to the ROM in the model, its checksums, and the cartridge in a console.
The calibration screens	The cartridge's screens as our own decoder sees them, the strip that names each frame, and what each screen is for; the grabber's frames join them once the cart is in a console.
The blank boards and the programmer	Photographed and read: which board takes the calibration ROM's two chips, what the EPROM adapter is for, and what is still not known.
The build, as it goes	The cartridge being made, one measured step at a time: the programmer on the bench, each chip written and read back whole, the board's jumpers read off both sides, the parts it takes, and what is still open.
The console's lockout chip	What the lockout chip does, the one-pin modification that defeats it with a meter reading at each step, how it goes wrong, what a cartridge with no lockout chip shows on the screen either way, and a twelve-second reading of the reset line that tells the two apart.