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evo
6 Posts |
 Posted - 03/26/2018 : 10:08:32
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Hi,
I know there are a couple of threads open on this, but I have a very similar problem and can't seem to fix it. I tried about 20 different M27C160 and one M27C1024. The M27C1024 is known to work and has been in my Neo Geo MVS as BIOS chip. I could successfully read the BIOS, but after erasing the chip, I couldn't write it back. I did some digging and found that it would fail much more frequently on specific values. E.g. 0x02 and 0x04 would almost instantly fail with Buffer=0x02/0x04 Device=0x00. When I fill the buffer with 0xAA, it writes and verifies fine. Please let me know if there's anything else I can do to check for issues with the board.
Thanks,
evo |
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| Reply #1
anniel
2572 Posts |
Posted - 03/26/2018 : 11:30:40
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quote:
Originally posted by evo
Hi,
I know there are a couple of threads open on this, but I have a very similar problem and can't seem to fix it. I tried about 20 different M27C160 and one M27C1024. The M27C1024 is known to work and has been in my Neo Geo MVS as BIOS chip. I could successfully read the BIOS, but after erasing the chip, I couldn't write it back. I did some digging and found that it would fail much more frequently on specific values. E.g. 0x02 and 0x04 would almost instantly fail with Buffer=0x02/0x04 Device=0x00. When I fill the buffer with 0xAA, it writes and verifies fine. Please let me know if there's anything else I can do to check for issues with the board.
Thanks,
evo
How long did you leave the chip in the eraser? |
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| Reply #2
evo
6 Posts |
Posted - 03/26/2018 : 11:48:07
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| I tried different lengths, between 30 and >60 minutes. The chips checked clear after erasing. |
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| Reply #3
anniel
2572 Posts |
Posted - 03/26/2018 : 13:40:00
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quote:
Originally posted by evo
I tried different lengths, between 30 and >60 minutes. The chips checked clear after erasing.
An EPROM can be damaged by too much UV... |
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| Reply #4
evo
6 Posts |
Posted - 03/26/2018 : 14:02:25
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| It's a pretty crappy and cheap eraser with low power. Also, I when I got the chips they were clear and even then didn't program. |
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| Reply #5
evo
6 Posts |
Posted - 03/26/2018 : 14:35:24
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| Of course I can't say for sure that they are not just all broken, but it seems highly unlikely, that they are all broken in exactly the same way. They all write a buffer filled with 0xAA just fine, but 0x02 is instant fail. It seems much more likely to me, that this is a software issue or a problem with the board, especially since I'm not the only one having these problems. |
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| Reply #6
evo
6 Posts |
Posted - 04/05/2018 : 08:43:29
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| Ok, I can confirm that my chips are definitely working. I bought a Top3000 programmer and have been able to write them and my system recognizes them. |
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| Reply #7
ZLM
2945 Posts |
Posted - 04/16/2018 : 21:31:35
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| OK. I think the adapter may have some problem. Contact support@mcumall.com |
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| Reply #8
evo
6 Posts |
Posted - 04/19/2018 : 10:08:10
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| Thanks, but I have already returned the programmer for a refund, as I have no use for 2 programmers. I hope that you're able to fix the problem for other customers, though. |
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| Reply #9
scrappysphinx
United Kingdom
25 Posts |
Posted - 08/03/2018 : 02:23:47
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I also have problems with my adp-054 adapter and the gq-4x4 programmer.
I can read 27c1024/2048/4096 chips but cannot write them. It fails everytime at 0.2%
I updated to the latest usbprg last night as I saw something about 27c4096 but made no difference. I also own a top3000 programmer and can program the chips on there so the chips are definitely good. I have previously written chips using this same gq-4x4 and adapter (I program Amiga kickstart chips and sega cd region free bios chips) but it will not work anymore :(
I can program other chips which do not use the 16bit adapter so I'm 99.9% positive it is the adapter at fault somewhere. |
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| Reply #10
mcumall
78 Posts |
Posted - 08/03/2018 : 22:22:44
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| Can you check what are the two chips part number on the adapter? Those two chips are soldered on the adapter and they should be 20 pin DIP chips. |
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| Reply #11
scrappysphinx
United Kingdom
25 Posts |
Posted - 08/04/2018 : 04:33:00
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My Adapter is a ADP-054 and was purchased from data-hardware in the UK.
The two 20 pin chips in the bottom left are both 74HC245N chips.
Thanks |
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| Reply #12
ZLM
2945 Posts |
Posted - 08/05/2018 : 07:14:14
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| Sorry. I need to know the brand. NXP? HLF ? |
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| Reply #13
scrappysphinx
United Kingdom
25 Posts |
Posted - 08/05/2018 : 07:42:15
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| They are both NXP |
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| Reply #14
ZLM
2945 Posts |
Posted - 08/05/2018 : 10:31:13
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That looks good. NXP always have good response on ADP-054.
Make sure you have placed your chip correctly. In 40 pin ZIF socket and pin one up-left.
Also, make sure the pin contacting are good. Between chip and adapter, as well as between adapter and programmer.
Also try slower speed.
If it still does not work, then you may need to get a new ADP-054. |
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| Reply #15
scrappysphinx
United Kingdom
25 Posts |
Posted - 08/05/2018 : 11:06:35
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As I mentioned I have used the adapter before and it worked fine. I am now struggling to write 1024/2048/4096 chips the 1024 will program but will fail repeatedly during burning but if I keep click write it will eventually finish and verify, 2048 and 4096 both fail immediately after pressing write at 0.2%
I have desoldered the 74HC chips and fitted sockets and put them back in case it was a.bad joint but writing still fails. I thought I'd try swapping them over and see if that helped but writing still fails however I've now noticed reading a pre-written working chip now gives some garbled characters in the output window so maybe one of those chips are faulty? I can get two new replacement chips for about £3 posted in the UK so do you think it would be worth replacing them and trying again before replacing the adapter? |
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| Reply #16
ZLM
2945 Posts |
Posted - 08/14/2018 : 21:27:09
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It is hard to say what is exactly wrong. But those two chips are easy to test.
Read the empty adapter will be all FF in buffer, if it is not, then something wrong. If read all FF, then you can try to ground the data pin of the ZIF one by one, you should get different bit be 0 reading each time. If this does not happen, then the adapter chips may be problem. |
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ADP-054 fails to write
