WWF Superstars no Music but has fx, also eprom burning question

itobandito

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WWF Superstars no Music but has fx, also eprom burning question

Hey gang,
So I made a supergun the other day and started testing/playing some of my boards. I tried my WWF Superstars and the music and sound fx where really really low and distorted. Both music and fx COULD be heard just at really low distored levels when the sound pot was cranked all the way. Then I remembered that the WWF SupersStars PCB requires -5v something my current supergun setup doesn't put out. So I decided to try it in my MK1 cab which does have a -5v output on the jamma harness connected.

For some reason now the sound effects could be heard but there is no music. I also noticed that two of the rom chips on the board did NOT have stickers covering the glass on the rom chips. Not sure if any UV light got in there and erased the chip while I was testing. I since covered the chips with electric tape to block the light.

Now I am not sure what the issue with this board is. I reseated all the chips, checked for blown caps, but can't figure it out. I do have a Willem Eprom burner I used successfully to burn some MK4 chips that got some UV light and got erased. I don't see the rom chips though listed in my Eprom burning program. The chips are labeled as being Toshiba TC571000D-15 chips. I just wanted to verify and if need be reburn the chips with my programmer. Anyone know of a setting or something that I can do this or do I need another adapter? Any tips for looking for other on board issues would also be helpful.
 
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check all voltages and read eproms and perform a chcksum. Check all wiring to connectors and clean edge connector with eraser. You should be able to find the roms in mame.
 
thanks for the advice, I tried all those checks but no luck, anyone have any additional tips?
 
It's a 1Mb EPROM but there are 2 different types of 1Mb EPROMs - JEDEC pinout and Non-JEDEC pinout. Here's what you do:

If the chip isn't listed in your programmer's software then go to http://www.datasheetarchive.com and get the data sheet for the chip.

Next get the data sheet for a common 27C010 EPROM and compare the pinouts on the two. If they are the same then use a 27C010 setting on your programmer to read the chip and compare it to the MAME archives. Use ROMIDENT to do this if your programmer doesn't do 32-bit checksums.

If the pinouts are different (typically A16 and /OE will be swapped) then see if your programmer supports a 27C301 chip and read it as that. If not, build an adapter to swap the 2 different pins so you can read the chip in your programmer as a 27C010.

Many times you can program the odd chip using a programming algorithm for another one - such as using the 27C010 setting to program the chip you have. If your programmer allows you to choose the programming voltage then always start with the lowest voltage first and try to program it. If unsuccessful then you can try raising the voltage.

HOWEVER, if the voltage you are using to program it is correct according to the datasheet for that EPROM then the programming algorithm just won't work with that chip and you have to try a different manufacturer's 27C010 algorithm. (Algorithm = what Vcc, or +5v setting gets used when programming and how long the programming pulses are applied. It's common for Vcc to be raised from 5v to 6.25 or even 6.5v when programming)

RJ
 
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