Hi,
I'm trying to do some reverse engineering, but don't really have a clue how to go about it.
We have a "pizza oven" for reflowing PCB boards. It is an APS GF-12A, and it has a controller board with a Z80 and two ROMS.
I'm trying to fiddle with some of the temperature limits in the program (max temperature is set to 550, and we need 650 fahrenheit).
I got a rom reader, and pulled the data off the two roms. The first one is called GF12 Right.hex and the second is GF12 Left.hex (both attached).
I tried to run the programs in an emulator called zemu, but didn't get very far. I don't know how the emulator works, or if I can get it to display what screen of the oven would display.
I also poked around in the ascii translation of the hex data, but couldn't see anything that popped out.
I'm not sure if disassembling will be fruitful, because there won't be much in the way of comments, labels, or variable names.
Anyhow, I was curious what people thought; what the best approach would be, or if there isn't a rat's chance in hell that I can achieve my goal.
I'm trying to do some reverse engineering, but don't really have a clue how to go about it.
We have a "pizza oven" for reflowing PCB boards. It is an APS GF-12A, and it has a controller board with a Z80 and two ROMS.
I'm trying to fiddle with some of the temperature limits in the program (max temperature is set to 550, and we need 650 fahrenheit).
I got a rom reader, and pulled the data off the two roms. The first one is called GF12 Right.hex and the second is GF12 Left.hex (both attached).
I tried to run the programs in an emulator called zemu, but didn't get very far. I don't know how the emulator works, or if I can get it to display what screen of the oven would display.
I also poked around in the ascii translation of the hex data, but couldn't see anything that popped out.
I'm not sure if disassembling will be fruitful, because there won't be much in the way of comments, labels, or variable names.
Anyhow, I was curious what people thought; what the best approach would be, or if there isn't a rat's chance in hell that I can achieve my goal.
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