I documented the Split Second PCB. The TMS1400 has a different pinout than the TMS1100- probably because the die is wider due to the additional ROM and had to be rotated to fit. I guessed at the signals, assuming the relative positions of the pins are mostly the same. So my assignment of the R0-R10 and O0-O7 signals could be reversed.
The OSC pins are connected together and to a 100pF cap to Vss and a 24K resistor to Vdd. I couldn't measure the clock rate directly, but did measure a 1.5mS period on pin 11 directly after power on with "1" displayed, and a 2.2mS period on pin 25.
