PLAnkton EV is the well known and popular substitute for the C64 PLA U17 part no. 906114-01 or 251064-01 - but with an exact voltage of 4.3 volts. Compatible with C64 mainboards: * Assy. 326298 * Assy. 250407 * Assy. 250425 * Assy. 250466 * KU-14194 * C64 Reloaded MK1 * SX-64 NOT compatible with C64 mainboard: * Assy. 250469