(Topic ID: 272899)

New! Pincoder Adapter

By pincoder

1 year ago

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  • 131 posts
  • 21 Pinsiders participating
  • Latest reply 6 months ago by jjoravec
  • Topic is favorited by 23 Pinsiders


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#65 8 months ago
Quoted from Talon:

Ok. Thanks for the reply and your help. I did order a burner(GQ-4x4) and eraser. It is supposed to arrive sometime tomorrow. I'll at least be able to check the roms with it. The rom in IC17 that I mentioned earlier looks suspect because it was repaired. I don't believe the sockets are scanbe, but I'll check again to be sure. I did make it through all of the other tests. It felt great to see the displays come to life. [quoted image][quoted image][quoted image]

I did not read all of your posts but keep in mind WMS really screwed up on the labeling of system 7 ROM chips around Black Knight era. The stickers almost never match what the board layout / ROM dump labeling. I forget which is mixed up, but at least two usually are. So if you have one not verifying right check the data against other ROM images.

#70 8 months ago

If the GQ-4X seems to burn a chip really slow and/or all the bits not stay flipped typically means the Vpp is too low. Usually this means you are trying to burn a 25vpp chip at 21vpp but also could be you need an external power supply and not just USB power.

All the M2732 (M2716 too) out of china are marked with A suffix. A good portion of them are 25v chips and some even 12.5v. When you burn the 25v type at 21v expect GQ-4x to take way longer than usual and you may have to repeatedly burn it over and over to get all the bits to stay right. When I pick the right Vpp it burns quick and right the first time.

If you burn a 12.5vpp chip at 21, or 25vpp it gets killed.
If you are not sure Vpp of dodgy china remark start at 12.5 (2732B) and go up until it seems to work.

#72 8 months ago
Quoted from Talon:

The chip I'm trying to burn is a TMS2532A-45JL. The other one(same exact chip), burned and verified with no issues. Same thing with the 2716 I burned, no issues. Both burned pretty fast too. So I tried to burn the same file that worked with the other 2532 and it still wouldn't burn. These were all done with a powered USB hub. I may have a power supply laying around here somewhere and have to look for it, but so far it's looking like the chip is bad
On one happy note: after I put in the 2 new flipper roms I burnt, my game now boots!

probably just a bad EPROM if you can do other identical chips. Powered USB hub should be good enough as it is for the laptop I use to burn with. It has to boost 5v usb up to 25v for these old chips.

I have not had good luck reusing TMS2532. Even some that are working, I erase them, and then they refuse to take another burn. HN462532 has usually been more reliable to me for what its worth. I go with 2732 whenever possible, but not possible on system 7 mpu without cutting and jumping a few traces.

#74 8 months ago
Quoted from Talonslair:

Thank you. Can you please point to a reliable source for the HN462532? Would appreciate it.

Funkward Tech is usually a good source for obsolete eproms.

ebay.com link: HITACHI 462532 2532 HN462532G UV EPROM 32Kbit x 5PCS

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