Main components

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Part NumberDescription
74LS04Hex Inverter
74LS32Quad 2-input OR
74LS74Dual D Flip-flop, Set & Reset
74LS244Octal Buffer and Line Driver With 3-State Output, active-low enables, non-inverting outputs
28C256Paged Parallel EEPROM 256Kb (32K x 8), DIP-28/SOIC-28
CY62256-70PC
74LS574
74LS283

Schematic schematic

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Schematic board layout

Schematic PCB render

Top PCB
Bottom PCB