More Willem Programer help

[ToyHicko]

Think this is the right place for this question

This may be a stupid question but I'm getting now where so need some help. Been running the NVRAM Memcal to tune the car up now happy I was going to burn it to an Eeprom (AT28C256 15PU) which I purchased from futurlec.

Programmer Willem from Darkwire PCB 5 running software V 0.98D10

Now from what I can understand the Offset required would be $38000 for $12P (correct me if I'm wrong) but get a "Error :Write Sector 0" Seems I can write to the first 32kB but not the rest of the chip.

I've tried selecting AT28C256 also 28C256 seem to have more luck with 28C256 but the chip doesn't work in the car.

the other thing is the erase chip doesn't work either.

[ToyHicko]

Well i think i have found my problem

It was me getting me bits and byte mixed up.

The other problem is the address line 14 is in a different spot on the 28C256 to the 27C256 it is swapped with the Vpp.
Anyway hoping to modify the memcal to suit and try again.

[ToyHicko]

So I thought I had it all sorted put the chip in the car and the engine light comes on straight away along with the thermo fan.
From what I have read that seem to indicate something wrong with the memcal eprom. Just to check the data was correct I made up an adaptor to plug the eeprom in the memcal into the reader and tried to read it as a 27C256. the program verified with the file. Any ideas on what my problem could be now?

Thanks

[Dec_head]

I do it the easy way and use the bin stacker in tunerpro always wanted to try writing to the memory address but haven't got got my head around to it yet.

[Holden202T]

umm $12P should be zero offset on a 256 chip i believe

good way to test if its burned alright, clear the buffer, read the chip back, save that to a file, then compare the one you used to burn to the one you got out of it.

[ToyHicko]

I agree with you Holden202 that there is no offset required that was what i was referring to when i said i had my bits and bytes mixed up for reason i was thinking it was a 256kByte not kbit chip which equal 32 kByte. So i was just having a bad day with that.

So now my only real problem is the memcal not working in the ecu

I did do a test kinda like that after i burnt the chip i cleared the buffer reloaded the bin file and did a compare/verify and was correct. Then inserted into the Memcal that has the cross over for pin 1 and 27 so the ecu can read it. and tried to read it as a 27C256 and verified it to the bin all was correct. So i can't see that the program should be any different then the NVRAM. But in the same ecu the NVRAM works fine but the 28C256 doesn't engine light straight away. Did forget to get the error code doing that tommorrow.

So if the Memcal isn't working would i be able to communicate to the ECU via USB? My guess would be no. Does the ALDL show the error code?

[Holden202T]

yeah i don't think you'll have much joy with the aldl connection.

[wake77]

as far as i know the 28c256 is not pin compatible with the 27c256 so it wont work,
i always use a 29c256 which is pin compatible and always works but they are getting hard to get now
other people are now are using the sst 27sf512 instead of the 29c256's but i haven't used one myself

[ToyHicko]

Wake77 I'm aware of the pin difference between the two chip that's why I made an adapter to swap the pins required 1 & 27 I'm sure this is all that is required as stated I can read the memcal as a 27C256 and get the correct program info.

Not sure but I think I might have found my problem the pins I use to read the memcal into the computer are longer then those in the ecu and looked like a few had pushed up under the chip. so I've pushed them back down plugged into my test wire loom and was able to data log with tunerpro. Hope that was the problem wouldn't find out to the weekend when I put in back into mates car.

Still learning hope to get it all sorted out ready to start on my car. Mates vp is the test vehicle as I know the limp home would work fine on his if required. His not complaining he is going to get a free tune out of it.