1802 World

1802 World

* System-5 for Running ELF/OS *

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My first brush with the 1802 was late 1977, like so many others the series of articles in Popular Electronics got me hooked. My first project was on a solderlss breadboard I wired 0x7B onto the data bus by directly connecting D0 through D7 to the appropriate +5V and GND signals and connected an LED and resistor to the Q signal. Using wires connected to the control lines I reset the CPU and then set it to run. I pulsed the clock line with a de-bounced switch and after 21 pulses the LED connected to the Q line lit up. From that moment on I was hooked. Comments to Ken

Front Panel from System-1, every real computer has a front panel.