Re: Chip for PSF2/GDSF7

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This message was posted by The Dumper, posted on January 16, 2002 at 22:20:27 coming from 209.204.139
This message is a reply to Re: Chip for PSF2/GDSF7 posted from Cush posted at January 16, 2002 at 10:57:50
> Wow, you've mentioned a LOT of excellent troubleshooting techniques. I'm surprised I didn't think of half of them since they make sense. Let me start by saying that I've had this unit for the better part of 5 years. (I'm the guy who wrote the conversion FAQ in '97 as AkumaX) So it could be an age thing.

Thanks for writing that, it's one of the few documents that makes any attempt to explain how to do it.

> My power supply is DC, center negative and labelled as 10V/850mA. A volt-meter puts it at almost 14V!! I hope it didn't damage the unit; I've used that power supply for about a year. Of course, that's easy enough to change.

Most wall-warts have poor regulation and you'll see a large increase in no-load voltage. A 10VDC unit should be OK voltage wise, the 7805 regulator can handle a peak of 35V. What you have to watch out for is the power dissipation through the voltage regulator, the higher the input voltage the more heat the regulator has to dissipate and you can exceed its power dissapation capacity long before your voltage gets too high. I prefer a 9V on mine because it lowers the heat dissapation on the internal voltage regulator (and I might even consider an 8VDC unit if I found one with the right connector).

> I can test the cart connector. I didn't do that before. If I plug a cartridge into the top, it still runs through the unit? I'll test that and post results.

There is some logic that is excercised, especially when running from the cart in super mode, try that first. Then try backing up the cart to dram and running from dram.

> I tried to get my parallel port working years ago without luck. I was using TSF3, but it sounds like a lot of people have trouble with that program. I'll give it another shot with GTOOL.

Jesus H. Christ I have seen the light! I got tsf3 to work! I'm going to post another thread on that.

> DRAM is the actual cartridge memory right? The little board(s) that plug on through two sets of prongs? I have one of those boards...32MBit of memory.

Yep, that's it. If you had two boards you could pull one to see if it was bad but the unit needs at least one to work.

> I forgot all about the self-test. Something else I'll try and post the results. I sure hope I can get it fixed, whatever the problem is.

> Thanks for the help...keep an eye out for my response.

> Cush

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