programming a 27c160

[masterchef]

Is there anyone out there who has programmed a 27c160 successfully using the willem programmer, adapter and software? If so please post what OS, and burning s/w you used, and any other info that might help. It appears from the posts I've read on the willem forum that there is little to no success. Some have indicated a problem with the s/w.

My specific problem is that I consistently get the same problem. I can read my 27c160, blank check it, and when I burn it I get an error at 0x144400 every time. If I then read the eprom, everything is 00. I am using .97i+ on a Win2k machine. I have successfully burned other eproms without the adapter.

Any help would be great.

[skinerd]

Is there anyone out there who has programmed a 27c160 successfully using the willem programmer, adapter and software? If so please post what OS, and burning s/w you used, and any other info that might help. It appears from the posts I've read on the willem forum that there is little to no success. Some have indicated a problem with the s/w.

My specific problem is that I consistently get the same problem. I can read my 27c160, blank check it, and when I burn it I get an error at 0x144400 every time. If I then read the eprom, everything is 00. I am using .97i+ on a Win2k machine. I have successfully burned other eproms without the adapter.

Any help would be great.


I found this it's not mine, but maybe you will understand what he is talking about......if you need more info, like where this came from let me know.........

you need to byte swap the file to be uploaded to the chip when using a willem 3.1 board and the 97i+ program

[masterchef]

I found this it's not mine, but maybe you will understand what he is talking about......if you need more info, like where this came from let me know.........

you need to byte swap the file to be uploaded to the chip when using a willem 3.1 board and the 97i+ program


Ya, I actually fig'd that one out by comparing it to the original. I would very much like more info plz.

[skinerd]

over at id-discussions, you may have to register to get in tho.....

correct the missing letters, or just do a search there for 27c160

h**p://id-discussions.co*/vbulletin/search.php?s=&action=showresults&searchid=1028563&sortby=lastpost&sortorder=descending

[sparcky1]

PM grasshopper2ant. He should be able to help you with any information you need.

[octoped]

Is there anyone out there who has programmed a 27c160 successfully using the willem programmer, adapter and software? If so please post what OS, and burning s/w you used, and any other info that might help. It appears from the posts I've read on the willem forum that there is little to no success. Some have indicated a problem with the s/w.

My specific problem is that I consistently get the same problem. I can read my 27c160, blank check it, and when I burn it I get an error at 0x144400 every time. If I then read the eprom, everything is 00. I am using .97i+ on a Win2k machine. I have successfully burned other eproms without the adapter.

Any help would be great.

Yes, I've done a few. I have seen that address and some others that occur repeatedly until the setup is cleaned up. I use W98, and have had success with 97i and 97h.
I believe those "favorite" address fails are the result of double (or triple?) spurious writes to unsettled addresses when you are programming lower addresses.
Here is what I did to clean up:
1. The 3 address lines from the main board to the adapter board need to made low noise. I used a 7 wire strip from an old IDE cable - about 6 inches long - arranged as G-s-G-s-G-s-G and connected the (G)round from the main board to the ground on the adapter with a small clip. Thus each address line is surrounded by the ground. The extra ground path doesn't hurt either.
2. I added a small 15 UF/25V electrolytic cap at the 12.5v output to GND right at the input to the Q1 transistor on the main board.
3. *** You MUST eliminate all background programs in Windows. I just left ONLY Explorer and Systray on the Windows 98 Task List. This is the most important thing you can do. I looked at the ByteVPP line with a scope before and after quieting Windows down. It is amazing that the first half of the chip survives the writing.
4. Keep your Pulse widths set at 250 and 50 during programming. I used default widths during reads.
5. Keep the rig as far away from your PC as your short LPT cable will let you. I used a 3 foot cable to the LPT1 port.
6. My power supply was a 14vdc, 360 mA wall adapter. The open circuit volts were 19.55 on this adapter. You should measure NO ripple volts (<5 mV) on the 12.5 v bus at the regulator.

These measures should get the 27C160 written successfully. I spent almost 2.5 weeks on these measures.

I did run into a module that erased OK, but wrote "0" too easily, I guess. It consistently failed at 1 address (No, not your address). This shows that you need a supply of modules.

>> o <<

[darak]

@ masterchef

any progress on your problem? i'm getting the same error @ address 0x144400. tried using version 97 h and i. it's a very slow process of testing for me since i don't have access to a uv eraser at home and i have to do it at work.