> It probably doesn’t need to be said that figuring out the Fourier components values for each character, and thus the resistor values of the R.O.M. board, was

> It probably doesn’t need to be said that figuring out the Fourier components values for each character, and thus the resistor values of the R.O.M. board, was a particularly tedious and laborious task. Each character was first traced out on to graph paper. As a periodic waveform is a closed function, once the character was manually scribed, the curve had to be closed by a segment of a length commensurate in proportion with the time of the blanking interval to the net 50 uS period. This was achieved by measuring the total length of the visible portion of the characters curve with a length of string. The string was then cut down in length to the correct proportion (six eighths visible to two eighths blanked) and then used as an aide to trace out the segment length closing the curve. This seems like a fun math problem to solve - given some basic character traces, create the appropriation using the given harmonics.