Unused Signals: Connect pins 6, 4, 2, 38 and 36 together on 6502 For the Apple 1, the following signals aren't needed so we're going to pull them up to VDD with a 10K resistor: NMIB (pin 6), IRQB (pin 4), RDY (pin 2), SOB (pin 38), and BE (pin 36)....