DIY memory chip

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Gear Head
Posts: 1
Joined: Mon Jun 25, 2018 9:18 am

DIY memory chip

Post by rezor » Fri Aug 17, 2018 5:04 am

because I swapped my mustang transmission to manual i want to reprogram EEC also :P Because installed EPROM is not typical one that I can reprogram in easy way, I started to investigate how it works. EECTCH98 documentation and eecsucka project was really useful so I want to try create my own j3 chip with xilinx CPLD with T4M0.bin on it. Because of that i have some questions:
1. Will EPROMDISABLE HIGH simply disable eprom to avoid interference? Or do I need desolder eprom completely?
2. What is maximum possible delay between strobe signal and correct output provided by eeprom? I'm wondering how fast chip should be to avoid situation when old data will be read twice by cpu
3. I have flash memory also in my EECs: 81C65 on W4M0 and 81C62 on C4P0. They have any purpose?

I'm not interested to buy QH or PnP stuff because I have already SA ECU for my project. I just want to do this for fun :)

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