Re: Chip for PSF2/GDSF7

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This message was posted by The Dumper, posted on January 17, 2002 at 19:57:19 coming from 209.204.139
This message is a reply to Re: Chip for PSF2/GDSF7 posted from Cush posted at January 17, 2002 at 10:59:48
> > Thanks for writing that, it's one of the few documents that makes any attempt to explain how to do it.

> You got that right; I spent many a day on IRC talking to these guys trying different things. Reading over it again, it's probably not the clearest explanation. Maybe I should take a crack at a revision. I didn't even know people still did this stuff until I found this board.

> > 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).

> Maybe I'll dig up a 9V adapter. I mean 10 should be OK, but to rate the thing at 14? Hopefully I can find a 9V...any specific unit you know that works? (I know a Sega Genesis adapter supposedly is perfect for the Double Pro Fighter).

I use an Atari Jaguar transformer (9VDC 1.2A center negative).

> OK, here goes my night of voodoo. First of all, I put my PSF2 back together and plugged it up. Nothing happened; I got a blank screen. So I took it apart again and hooked it up with just the PCB and floppy drive. I got the screen to come up. Taking the first bit of advice, I ran the self-test. It started running and suddenly the screen went blank again. Subsequent power-ups came up with the blue screen and an "SRAM Error" message.

> So I take the little cart off (even though that's DRAM) and plug it back in. I completely remove the floppy drive from the unit and plug the unit back in. Loads up and self-tests perfectly a bunch of times.

> I stick in Street Fighter 2 Turbo and run it. It's fine. I try to back it up. It's fine. I run a self-test. It's fine until it gets past the ROM tests and says "Floppy Drive Not Found"...of course, I don't have it attached.

> I plug the floppy drive back in and turn it on. No errors. Self-test. No errors. Load a game from disk. No errors. Run a game. No errors. And since then, it worked without a problem all night.

Great, glad to hear you got it working!

> I dunno what happened. But I'm glad it works now. BTW, IS there anywhere to get more DRAM? I wouldn't mind having it.

I wish I knew where to get more dram. Bung used to sell extra dram boards but most of those seem to have ended up inside Game Doctor units.

> Cush

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