Ways to implement a selectable 3rd drive
#2
You can't drive more than 2 sets of bus signals at the same time. So, even having the drive select high (unselected) for a 3rd (or 4th) drive it is still going to be a problem for the bus. It's balanced literally for two disk drives only. You would need to disconnect ALL of the lines on the bus, or at least the RD_DATA, WR_DATA, WR_GATE... probably STEP and DIR as well. I don't see any good solution. When I designed SuperCard Pro I looked for an option to allow up to 4 disk drives to work and the only way was to add latches/buffers for each extra drive. That was too much hardware, so I opted to support just two drives.
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RE: Ways to implement a selectable 3rd drive - by admin - 05-21-2020, 01:17 PM



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