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Quoted from Quench:The schematics on PinWiki indicate there's eight PROM sockets. PROM part numbers:
U1___ E-726-22
U2___ E-726-07
U3___ E-726-21
U4___ E-726-11
U5___ E-726-04
U6___ E-726-03
U7___ E-726-02
U8___ E-726-10
BigAl56, you got Ballys Service department phone number?
No PROMs but some manuals available at:
https://www.pinwiki.com/wiki/index.php/Pinball_Test_Fixtures#Bally_MPU_Test_Fixture
For the record, it was 800-621-0108.
Quoted from BigAl56:Got to call up Arnie over in support and check on those proms.
Here he is with your boardset......
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Paradise, NV