Maplins 8bit Input Port

A simple 8bit Input port from Maplin. Intended (among others) for use with the Maplins Weather Satellite Receiver.

Can be mapped to Port F8F0h..F8FFh (jumper select-able). F8F0h (with a mirror at F8F1h) can be considered as default (this address is also recommended as 8bit-input address in the Weather Satellite source code).

Note that the original article specifes addresses F8E0h..F8EFh instead of F8F0h..F8FFh - that is wrong, the schematic connects A4 to EN1, so ports are accessed when Address Bit4=1.

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  Schematic

• Amstrad 8bit Input Port (for use, among others, with the Satellite Receiver) - project 20.b (pdf)