Notable chips on the board include:

Ricoh RP2A03G 8-bit, 1.79 MHz CPU

Ricoh RP2C02G-0 8-bit, 5.32 MHz PPU

Toshiba TC40H368P hex bus buffers

Sharp LH5216D-12 static RAM

Hitachi HD74LS139P decoder/demultiplexer

Fujitsu MB74LS373

Unsurprisingly, lead solder abounds on the bottom of the board. RoHS standards weren't established until 20 years after this puppy was made.