Spare chips for System 1 boards

CPU board: 7404 (switch strobes), 7405 (switch returns), 7408 and 7448/74LS48 (displays), 7417 (coil buffers) and 4049. Driver board: 74175/74LS175. Score displays: UDN6118. Power supply: UA723 (NTE923).

Systems

• Gottlieb System 1

Related tips

• Which spider chips fail and why
• Aftermarket System 1 CPU boards
• Powering a System 1 CPU board on the bench
• Socketing a replacement spider chip
• Ni-Wumpf board coil buffer chips
• The six Rockwell "spider" chips on the CPU board
• Swapped U4 or U5 spider still does not work
• What boards a System 1 game has

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)