The code for the expansion board I was working on for the VZ200 is up on github.
VZ Super-Expander
The IDE interface was going to be based on the TRS-80 Lo Tech interface.
The CPLD was just going to be used for address decoding to keep the pin count down. That would require some external chips for buffering, LED, etc..., but it was only two or three parts I remember right. The driver was going to be based on modified code from the Lo Tech driver just to keep things simple.
VZ Super-Expander
The IDE interface was going to be based on the TRS-80 Lo Tech interface.
The CPLD was just going to be used for address decoding to keep the pin count down. That would require some external chips for buffering, LED, etc..., but it was only two or three parts I remember right. The driver was going to be based on modified code from the Lo Tech driver just to keep things simple.
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