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add link to 28C256 notes
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@ -7,7 +7,9 @@ Utility to unlock 28C256 Software Data Protection (SDP) for the
programmer design. This hardware is similar to the TommyPROM hardware, but it uses
different shift register chips and different pin assignments.
To meet the timing requirements of the SDP unlock, this code uses direct port writes
To meet the
[timing requirements of the SDP unlock](https://tomnisbet.github.io/TommyPROM/28C256-notes/),
this code uses direct port writes
to set and read values on the data bus. It will work with Arduino Uno and Nano hardware,
but would require changes for other platforms.