Re: How much strain can a IIGS power supply handle?

[Rubywand <rubywand@swbell.net>]

Louis Mazzei writes ...
> 
> Greetings.
> 
> Well, my old IIgs had one Apple 3.5" and one Apple 5.25" FDDs, a 4MB GS Juice
> RAM card, and Apple Hi-Speed DMA SCSI card, a Cermetek 1200 baud MoDem and ran
> solid as a rock, too. I had an Applied Engineering heavy duty power supply ,
> though. I got it because I actually custom-built my IIgs a number of years ago
> and the Apple PSU was rated at 35 watts, 1 amp whereas the Applied Engineering
> PSU was 60 watts and 2 or 3 amps. I left the PSU fan in there (I highly
> recommend putting it back) and had an Applied Engineering Conserver on top so
> my IIgs always stayed super cool.
> 
> If you are worried about the stock IIgs PSU, you can still find them new here
> and there, though people want too much for them. I think jameco may have one or
> two left.
> 
> Anyhow, to make a long story even longer, I had a buddy who had a IIgs with a
> stock PSU and had a lot more stuff inside than I had and he had no internal fan
> AFAIK and never blew the thing up. In fact, I've never known anyone who has...
> I just got the heavy duty PSU myself because I was paranoid! ;-)
> 
> --
> Posted via Mailgate.ORG Server - http://www.Mailgate.ORG


     Our IIgs is still on its original (1986) power supply modified to swap in
heavy leads.

     The IIgs is a ROM-01 with 4MB Expansion memory, ZipGSX accelerator, RamFAST
SCSI, Focus HardCard, MockingBoard, TDX IIgs Stereo card, and Sound input
digitizer board. So, it is fairly loaded (though not as heavily as systems which
add the PC Transporter and Second Sight boards). There is a SystemSaver-GS sitting
on top to pull cool air into the case; but, we've never used any internal fans.

     The main limitation on the original PS is the pissant leads that connect to
the motherboard. These limit the current you can draw to something less than about
2.5 Amps on the +5V line. You can dram more current; but, by then, you have
glitching problems due to noise and low motherboard voltages.



Rubywand