Run Freedom or Night Rider on a -17 with 2716s at U1 and U6

Steps

• Cut the trace between U1 pin 18 and U2 pin 18, and the trace between U1 pin 21 and pad E7.
• Wire U1 pin 21 to U1 pin 24.
• Wire U1 pin 18 to U17 pin 11, and U1 pin 22 to U2 pin 22.

Systems

• Bally MPU AS-2518-17

Related tips

• Freedom and Night Rider used tiny 512-byte ROMs at U1 and U2
• Mod1: two 2716 EPROMs at U2 and U6 on a -17 or M-100
• Mod3: 2716 at U2 with a 9316 at U6 on a -17 or M-100
• Test EPROM: the least an MPU needs to run it
• Making a 9316-to-2716 adaptor socket
• U9 pin 2 (halt) is not high
• -17 and M-100 boards cannot run 1979-1985 games without modification
• Mod4: convert a -17 or M-100 to take 2732s at U2 and U6 (runs any Bally game)

Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)