DataFlyer 500: PAL equations for the Amiga 500 hard disk controller
The original PAL chips of the DataFlyer 500, a side-expansion SCSI/IDE hard disk controller for the Amiga 500 made by Expansion Systems, are copy-protected and cannot be read. After years of work, keithgh1 has published replacement logic equations for GAL16V8 chips on GitHub, reconstructed through black-box testing of the original chips.