Quantity   Component name
1 × Cermetek CH1810 DCPH Direct Connect Protective Hybrid. This was the phone line interface.
1 × Teltone M956 DTMF Tone Decoder
1 × SN76489 Digital Complex Sound Generator
1 × Zilog Z8671 Single Chip BASIC Interpreter (Z8 processor variant)
2 × HM6116 Memory ICs / Static RAM (SRAM)2Kx8 Static RAM
1 × 2732 EPROM
1 × 5213 EEPROM EEPROM - holds passcode
1 × PAL10L8 Semiconductors and Integrated Circuits / Misc. Semiconductors and Integrated Circuits
1 × 74S288 32x8 PROM
2 × 74LS373 Electronic Components / Misc. Electronic Components
1 × 74LS244 Electronic Components / Misc. Electronic Components
1 × 74S225 16x5 FIFO
1 × 74LS374 Electronic Components / Misc. Electronic Components
1 × 74LS138 Electronic Components / Misc. Electronic Components
1 × 74LS240 Electronic Components / Misc. Electronic Components
1 × 74LS245 Electronic Components / Misc. Electronic Components
1 × MC1488 Interface and IO ICs / Line Drivers, Receivers, Transceivers
1 × MC1489 Interface and IO ICs / RS-232, RS-422, RS-423 and RS-485
1 × 7.3728 MHz Crystal
1 × 3.58 MHz Crystal
8 × 12V Relays (Not shown in schematic - implemented on separate board)
1 × ULN2803 Relay Driver (not shown in schematic - implemented on separate board)