Limrose Digital Patch Board, 1972
The Limrose Electronics digital logic tutor or breadboard. The design is from 1972, but this model was made in about 1982 (by the date codes on the power supply). Top left is a switchable 2Hz or 18kHz clock, built not with a chip but with discrete transistors. Below that is a bank of logic state switches (not debounced). On the right-hand side is a row of red LEDs for us as logic level indicators -- each one has a driver transistor (BC182). Each 16-pin socket has two rows of pins or interconnections, plus some power pins. There's a 5V power supply inside.
Limrose Digital Patch Board, 1972
The Limrose Electronics digital logic tutor or breadboard. The design is from 1972, but this model was made in about 1982 (by the date codes on the power supply). Top left is a switchable 2Hz or 18kHz clock, built not with a chip but with discrete transistors. Below that is a bank of logic state switches (not debounced). On the right-hand side is a row of red LEDs for us as logic level indicators -- each one has a driver transistor (BC182). Each 16-pin socket has two rows of pins or interconnections, plus some power pins. There's a 5V power supply inside.