hrspwr

iTrader: (3)

I have a couple of the above mentioned chips and it seems I cannot burn them. have a willem 3.5 dual power programmer and have double checked the settings. I did a search and there was one thread that said to use a different version of the software(which I did) with no luck. Anyone know how to program these chips?

The_Punisher454

First make sure they are really 27sf512's, apparently there are quite a few counterfeit chips being sold. I get mine from xenocron and no problems so far.

I dont have a willem, a PP2 actually so cant hale on that part.

DOOM Master

I've had a few bad ones, not sure what the reason for that is. I've noticed that sometimes I have to erase them 2-3 times before they will program properly on my PP2. Once again, no idea why. Seems that if I only erase them once, they will not program correctly and it then the info isn't verified as correct.

Six_Shooter

iTrader: (2)

I had an issues with a Willems DP programmer, after a few years of using it. It seemed to burn out the chips (damage them), so I bought a Willems GQ-3X, and have had no issues since, then Moates supplied me with a Burn@ and it's even easier to use.

hrspwr

iTrader: (3)

I'm not sure what is happening. All i know is that when I try to do anything with them nothing takes. Can't erase, can't program nothing. Any other ideas?

The_Punisher454

Maybe try some other types of chips. You can read old computer bios chips, and some are flash and eeprom which will allow you to test the erase/burn functions.
I believe you can also write to an eprom without erasing it, I think you can set bits but not erase them, or something like that. The point is that you should be able to find some chips to test if you really look around, there more common than people think.
If your willem works with other chips then maybe its the chips you are using, if not it may more likely be the programmer.

hrspwr

iTrader: (3)

I should have mentioned that. I am currently using 27128's in my car and they work fine. Can burn, UV erase, Read the whole nine. It's just when I try the 512's that I can't seem to get it to work. That is also the reason I wanted to go with the 512's......faster erase times.
I got the chips from Moates....so i cannot see them being bad. Is there a specific way to set the willem up to burn these?

Six_Shooter

iTrader: (2)

Yes, the dip switches need to be set properly along with a jumper.

hrspwr

iTrader: (3)

I set the DIP switches, but what Jumper are you refering to, as there are a few?

This is what I do. I open the software to burn the bin to the chip. Select the 27sf512 from the device list and set the DIP switches. I make sure that the erase jumper is not set when programming, and set when erasing. The Vpp jumpers are set to 12V (as per the willem instructions) Next I verify hardware, put the chip in and try to burn/erase/read. Nothing.

RBob

iTrader: (1)

There are some other threads here about that programmer and the flash chips. IIRC, one mentioned that an external 12 V supply is required. As the USB port is only 5 V.

RBob.

hrspwr

iTrader: (3)

I can give that a shot. The way that I understood it was that either the usb or external adapter would provide sufficient voltage to the programmer.
Going back to the jumpers, is there any specific way it needs to be set? Obviously the Vpp needs to be set to 12V and the DIP as well, but anything else?

Six_Shooter

iTrader: (2)

When my Dual Power programmer worked (and had a laptop with an LPT port), I didn't need an external power supply to program SST 27SF512 EEPROMs.

hrspwr

iTrader: (3)

I figured as much. do you remember what version of the software you used, how the jumpers were configured? Anything to help me burn those darn things.

Six_Shooter

iTrader: (2)

It was the latest version at the time, probably about 3 or 4 years ago. I set the switches as per the Willems docs.

There is also a thread on the moates forums that addresses the Willems DP programmer specifically and the dip switch/jumper settings.

hrspwr

iTrader: (3)

Do you have the link by chance?

Six_Shooter

iTrader: (2)

No, just go to the moates.net site, go the forums and search "willems" there.

hrspwr

iTrader: (3)

Did the search and I found the sticky there. Nothing new that I didn't already know. I know the erase jumper needs to be removed when programming and placed when erasing. The offset for me will need to be c000 as I originally have 27128's.
What else could be the issue? There are a couple other jumpers on the baord, for Vpp and Vcc. What do those need to be set at?

RBob

iTrader: (1)

Have a link to the actual programmer that you have? I did a net search and found several units, none of which support the 27SF512 lash chip.

I didn't find any that are listed as "willem 3.5."

RBob.

hrspwr

iTrader: (3)

Took some digging, but I found a link that has the 3.5-5.0 programmers.
http://www.mcumall.com/support/DualP...ide.htm#Willem Package Item Image
My board is the first on the list, the 3.5. (I have also set the board to use 3B and used a previous version of the software as per this link https://www.thirdgen.org/forums/diy-...t-27sf512.html)

RBob

iTrader: (1)

Claims that the 27SF512 chip is supported. Are you using a P/S to supply the 12 required for the VVP? Maybe put a DVM on that pin and do a program. Then see if it is actually +12 volts (11.4V to 12 V is the spec).

Note that the device needs to be erased before being programmed.

RBob.

hrspwr

iTrader: (3)

I am going to try a p/s tonight. There have been others here that have not used the p/s and program those chips fine. That was why I could not understand the issue. I will give the DVM a try as well. Believe Vpp is on pin 1 correct?
Yes I always erase the chip before trying to burn, says successful, but may not be.

RBob

iTrader: (1)

VPP is pin 22, ~OE when low.

VDD is pin 28 (+5 V)
VSS is pin 14 (GND)

After an erase a blank check should confirm all $FFs.

RBob.

hrspwr

iTrader: (3)

I checked the voltage and it was at 17V across pin 14 and 22(not sure why as that is how the manual says to set it up AND there is no 17V to config with the jumpers). Changed it over so that it is 12.5V and still none of the chips program, total of three. I understand that the first one could be damages due to the higher voltage, but the second two? Also with the way it was set up, my 27128's programmed just fine. Not sure what that is all about.

RBob

iTrader: (1)

According to the data sheet the absolute max VPP is 14.0V relative to GND. I agree that the chip that had 17 V on VPP is likely bad.

Your mention of the 27128 programming OK is different then these flash chips. The programming algorithm is completely different.

What I found interesting is that in the Willem link you provided they list these devices as an "Erasable EPROM." When in reality they are a flash based device. And using that phrase is redundant, as the E in EPROM stands for erasable.

To be honest, it may be time to bite the bullet and get a Burn2. They work rather well.

RBob.

hrspwr

iTrader: (3)

I am thinking so as well. Appreciate the help, hopefully I have better luck in the future.