tvStills is a first attempt at creating a box that reads small cards that synthesize NTSC video.

The code is quite simple, but very frustrating because of synchronization issues. Thankfully the ATTiny15 spec sheet gives the number of clock cycles for every instruction. Here is the code for the 4 cards i programmed so far:
hello.asm
hellow.asm
lines.asm
checker.asm

Boards layout: card.brd

The reader holds the power supply for powering the cards and a couple resistors for generating NTSC pulses.
Here is the inside of the reader:

Here is are a few cards:

The cards are inserted in the card edge connector:

Here is an example of the video generated by one card: