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Old eprom programmer help.

I hope i done it well.
 

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Almost correct.

I would suggest aligning the horizontal trace in post #41 EXACTLY on the dotted line. If you are going to be measuring voltages (and you will be) you need to know EXACTLY where 0V is...

I would also set the second channel [2] to 1 V/div as well. If you are measuring TTL signals (which the majority of our signals will be) then 1 V/div would be suitable.

I still see a 10X probe setting on the top line for both channel 1 and 2 though?

Dave
 
Hi dave , i took both eproms of the board i erased them with uv light in order to write a fresh codes on them , i went to matthieuw benoit website and i ve downloaded two firmware files when i went to write them programmer says the data is bigger than a device , the original code 8k that one i downloaded 16k any idea.
 
You did the absolute wrong thing there I am afraid...

I assume you have a separate EPROM programmer then?

Why didn't you read them FIRST and then compare them to the downloaded files?

You would have found the size error without destroying the originals!

Dave
 
Dont worry , i ve saved the data of each eprom nefore to do that :--)
 
samib71 said:
Hi dave , i took both eproms of the board...when i went to write them programmer says the data is bigger than a device , the original code 8k that one i downloaded 16k any idea.
Click to expand...
Perhaps you need to write the first half of the 16K file to one 8K EPROM, and the second half of the file to the other 8K EPROM?
 
In this case there is only one file to be used, what about the second file?
 
Please how to put the first half on the 2864 ve got gq4x programmer.
 
Before you start wasting your time and going down a rabbit hole, why not check the original EPROM code?

Is the 27128:

1. Full of unique code?
2. Is half of the EPROM 'empty' (e.g. programmed with the same value)?
3. Is the upper half of the EPROM a duplicate of the lower half?

Dave
 
Ok you re right i will write original code and continue svope testing.i will post later.
Good evenning
 
samib71 said:
In this case there is only one file to be used, what about the second file?
Click to expand...
If your programmer can't program a range from a file, split the file into two parts, the first 8K of it into one file and the second 8K of it into another file.
 
I have no problem with 27128 the whole file can fit ,but no with 2764 which can hold only 8k and the file from mattieuw benoit is 16k.the problem i never done that im lost.
 
Code: 
dd if=file16.bin of=file8lo.bin bs=8K count=1
dd if=file16.bin of=file8hi.bin bs=8K skip=1

That's on Unix; I have no idea how to do it on Windows.
 
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