‘Sentinel’ MFM/RLL hard disk controller

About a year ago I made an Arduino board that worked with old MFM/RLL (“Winchester”) drives by utilizing a Western Digital controller chip. As this was limited to a particular format (WD), I decided to revisit this project, make it more generic and move the disk data handling part to software: Project Sentinel: swapping the Arduino+WD42C22 (right) for a Raspberry Pi … [more]