Control board clock frequency

Crystal Y1 runs at 3.579545 MHz and Z2 divides it by 4, giving a CPU clock of about 895 kHz into pin 37 of the 6502.

Systems

• Gottlieb System 80
• Gottlieb System 80A

Related tips

• System 80 control board chips
• Control board power-on checks
• Buffer chips protect the control board LSI parts
• The battery-backed 5101 RAM uses only data lines DB0 to DB3
• Test connector TC1 pins for the address and data bus
• How the 32 option switches are read
• Key pins on the System 80 LSI chips
• Control board A1-J1 power connector

Source: System 80 Service Manual, Gottlieb