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