The ‘UEC-01’ and ‘UEC-02’ are two custom ICs you can find on most Seibu/TAD Corporation PCBs also marked as ‘HB-1’ and ‘HB-2’.They are ceramic modules in SIL/SIP package.Here’s how they looks like: The first handles I/O, the latter drives coin counters/lockouts.Reproducing them was straightforward given the simplicity of their internal circuit so for sake of completeness … Continue reading Seibu ‘UEC-01’ – ‘UEC-02’ and Jaleco ‘JK-03’ reproduction