Hugo Holden
Veteran Member
In the SOL-20 there is an input port allocated address FF, which has an array of "sense switches" that could provide a fixed byte of data on that port.
What would be some examples of the practical applications of having these switches there and that data available as a fixed value on an input port ?
(The port control signal activates 7406 open collector buffers that feed the switches and the "data" is applied to the data lines DI0-0 to DIO-7 which are normally held logic high (3.36V) by a 330R & 680R resistive divider).
What would be some examples of the practical applications of having these switches there and that data available as a fixed value on an input port ?
(The port control signal activates 7406 open collector buffers that feed the switches and the "data" is applied to the data lines DI0-0 to DIO-7 which are normally held logic high (3.36V) by a 330R & 680R resistive divider).