Rinse and repeat for each of the 256 memory addresses on the Microchip 27C256 EPROM. The memory address is selected by setting each of the 15 address pins high or low, and then reading the status of the 8 data pins to extract one byte of data. After realizing that could only clone the contents, but not view or modify it, he started looking at ways to do that.ĮPROMS are programmed using higher voltage (12.5 V – 25 V) but to read them 5 V is used. This was done with an old Advantest R4945A EPROM programmer, which supposedly also used to clone Famicom cartridges back in the day. Owns a pair of early 1990’s Honda’s with custom tuning on their stock ECUs, and after having to get the ECU repaired on his ’93 civic, he found himself going down the rabbit hole of Honda ECU EPROM chips.ĭuring the repair process, the tuning shop owner, or as refers to him, made a backup of the custom tuning to another EPROM chip.
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