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xArtx · 15 August 2021, 06:10

The floppy drive can be implemented with 4 stock logic chips to decode addresses (if you call that easy) as done by Bruce Abbott in 1995, but there was no way to decode _INDEX (IIRC don’t quote me) some hardware banging games did use it, so the interface was only guaranteed to ready legal system disks, and yeah I built one, and it worked. Later also did the parallel port in the same manner. The registers may exist internally. They do read as one state or another, but as stated already, it makes no difference if the pins aren’t there to physically access.

15 August 2021, 06:10	#5
xArtx Registered User Join Date: Jun 2013 Location: Australia Posts: 685	The floppy drive can be implemented with 4 stock logic chips to decode addresses (if you call that easy) as done by Bruce Abbott in 1995, but there was no way to decode _INDEX (IIRC don’t quote me) some hardware banging games did use it, so the interface was only guaranteed to ready legal system disks, and yeah I built one, and it worked. Later also did the parallel port in the same manner. The registers may exist internally. They do read as one state or another, but as stated already, it makes no difference if the pins aren’t there to physically access.