forked from Apple-2-HW/TommyPROM
16 lines
745 B
Markdown
16 lines
745 B
Markdown
#Unlock Ben Eater Hardware
|
|
|
|
![Ben Eater EEPROM Programmer](../docs/images/ben-eater-hardware.jpg)
|
|
|
|
Utility to unlock 28C256 Software Data Protection (SDP) for the
|
|
[Ben Eater EEPROM](https://github.com/beneater/eeprom-programmer)
|
|
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 set and read values on the data bus. It will work with Arduino Uno and Nano hardware,
|
|
but would require changes for other platforms.
|
|
|
|
**NOTE** that this sketch **will not** work on TommyPROM hardware. It is included here
|
|
to help people using that hardware to unlock their chips.
|