Initial Boot (Intellivision)

in order to boot at all to even a black screen, you must have at every single power rail this is because the cpu alone requires the +5, +12, +16v and 3v rails, and the stic is powered from the 5 7v flying lead rail as soon as the 5 7v flying lead rail is present the system boots it waits until that rail is present before booting without a game inserted there will be a 1 second delay before a black screen / red screen typically sometimes you will need to press the reset buttons a few times to get the stic to come out of reset without a game boot sequence all power rails must be present 4mhz crystal passes through 74ls00 nand to generate stic clock stic !reset internally pulls to 5 7v (can be sunk by reset button or cart) stic receives 4mhz mclka from 74ls00 stic generates phase signals (ph1/2, 11v 2mhz) ph1 goes to sound ic ph1/2 pass through 7407 buffer then to cpu stic brings system out of reset by keeping !msync high cpu reads game in and the rest of the system all starts up