How System 80A differs from System 80
System 80A took over from System 80. It brought better bookkeeping and self test, allowed seven-digit score displays and gave more coin and credit options. The only control board change was a new pair of program ROMs at U2 and U3, now in sockets, so one control board serves either system once it has the matching ROM pair.
Systems
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Source: Premier Technology Parts Catalog (System 80, 80A and 80B), Gottlieb / Premier