Sonic LCD game

Sonic used a Sharp SM-511 MCU (die ID N71)

ROM array

ROM array with top metal removed

raw ROM dump

ROM dump

melody ROM array with top metal removed

Melody raw ROM dump

Melody ROM dump


Buttons:
        K1         K2          K3        K4        Beta      BA
S2      --         --          Up        --         --       --
S3      --       Right        Left       --         --       --
S4      --        Down         --        --         --       --
S5     Spin        --          --        --         --       --
S6    Pause        --          --        --         --       --
Batt+   --         --          --        On         --       --
Batt-   --         --          --        --        Off       --
Batt-   --         --          --        --         --     Sound

Piezo:
transistor with emitter to batt- and collector to piezo; other piezo wire to batt+; coil across piezo
base of transistor to cathodes of two diodes; one diode connects to R1 via 120K resistor, other diode connects to S1 via 39K resistor

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