MTHD
From Bitchin100 DocGarden
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This project it still under development.
The basic idea for this project is to add a harddrive via the System bus on the 100/102/200
The circut is based on a 8255 which controls the harddrive data and control signals.
A 74573 is used to split the ADDRESS and DATA singnals and a 138 is used for IO mapping