using 87c256

kelvin · Post by **kelvin** » Sat Sep 04, 2010 4:49 am

I have a VN computer with what I assume is a 87c128 eprom. The first memory location appears dead as it always reads as FB, no matter how long I cook it in the eraser, the rest of the buffer shows all FF's. I have a supply of 87c256's. Can I just swap it over and I believe I need to write the bin twice or double it up or something.

vn5000 · Post by **vn5000** » Sat Sep 04, 2010 4:53 am

Its not 87 its 27c128

kelvin · Post by **kelvin** » Sat Sep 04, 2010 4:54 am

Sorry, that's what happens when you start typing before engaging your brain.

vn5000 · Post by **vn5000** » Sat Sep 04, 2010 4:56 am

Yeah just stack the bins 0000 -3fff 4000 - 7fff

kelvin · Post by **kelvin** » Sat Sep 04, 2010 5:09 am

Thanks, I'll give it a go.

Post by **VL400** » Sat Sep 04, 2010 7:56 am

Or if your programmer supports it just load it once starting at 4000 - The ECU will never address the 0-3FFF area of the EPROM so its not required unless you want to have switchable maps.

using 87c256

using 87c256

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