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prog:start [2013/03/15 15:09] mcmaster |
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| From Lord Nightmare as taught by Guru: | From Lord Nightmare as taught by Guru: | ||
| * Heating bit-rotten chips up may improve reads. Use a hairdryer or heatgun to heat up a chip, but don't make it hot enough to damage the eprom reader; while the chip is still hot, dump it. Reason this works: Heating will raise the ambient charge/ | * Heating bit-rotten chips up may improve reads. Use a hairdryer or heatgun to heat up a chip, but don't make it hot enough to damage the eprom reader; while the chip is still hot, dump it. Reason this works: Heating will raise the ambient charge/ | ||
| - | * Undervolting chips will also improve reads of bit-rotten chips, assuming your programmer supports that feature; lower the +5v/VCC input down to 4.8 or less volts and dump it. Reason this works: the floating gate charges in eproms are compared using some sort of a comparator circuit (differs by chip) to the VCC level. Lowering the VCC level will lower the threshhold somewhat between the ' | + | * Undervolting chips will also improve reads of bit-rotten chips, assuming your programmer supports that feature; lower the +5v/VCC input down to 4.8 or less volts and dump it. Reason this works: the floating gate charges in eproms are compared using some sort of a comparator circuit (differs by chip) to the VCC level. Lowering the VCC level will lower the threshhold somewhat between the ' |
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| A programmer JM use to have. Programmed via serial port. It seemed quirky and my particular unit seemed defective/ | A programmer JM use to have. Programmed via serial port. It seemed quirky and my particular unit seemed defective/ | ||
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| + | ====== Xeltek ====== | ||
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| + | Lower cost than BP Micro but also looks like less support | ||
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| + | ====== BP Micro ====== | ||
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| + | High quality but reasonably expensive programmers | ||
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| + | [[bp_micro|Main page]] | ||