User`s guide

voltages appearing across the power supply output will be larger. If you notice
otherwise 'mysterious' system glitches despite having a good, solid looking
power supply and/or that power supplies tend to crater when connected to your
Apple II, swapping in heavier leads may
be a good idea.
Our current GS power supply is the one which came with the computer when it
was purchased in the Fall of 1986. Yes, our GS was plugged into a System Saver
IIgs fairly early on; but, then, line deglitchers have been a nearly universal
accessory since the mid-1980's. The main difference between our power supply and
the piles of blown units is that fattened +5V, Ground, and +12V leads were added
back when we upgraded to an accelerator board. Despite having also added a Focus
Hard Card drive, RamFAST SCSI
interface, and a couple other boards, system crashes are very rare-- perhaps
one every 8-10 sessions (and those usually relate to a fault in the software).
The 'bottom line' is that, so long as the power supply is not actually
defective, real world experience supports fattening at least the +5V and Ground
power supply leads as a major step in curing crashes due to system noise. (See
also Marvin Miller's GS WorldView article: "I Did the IIgs PS Mod, and the
glitches are gone!" at http://apple2.org.za/gswv/a2zine/Sel/IdidThePSmod.html .)
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From: Rubywand
006- Fattening my GS's power supply leads greatly reduced
system crashes. Is there any more that can be done to
eliminate glitches?
Yes. There is another weak link in the power delivery 'chain': the
motherboard circuit traces supplying power to Slot boards are fairly skimpy,
especially on ROM-01 boards. A heavy power user, such as a souped-up Transwarp
accelerator board, in Slot 7 can produce significant noise up and down the
entire Slot 'backplane'.
The cure is to remove the motherboard and tack on #18 - #16 gauge jumper
leads. (See Question 007 for details.)
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007- Does anyone here remember the Mac SE upgrade kit
that included 18-ga wire, a bunch of new caps and other
fun stuff, that increased the computer's amperage and
allowed more upgrades, also fixed many problems? Is there
a power supply upgrade kit for the Apple IIgs that
someone has constructed?
Okay; here is your very own
A2-2000 On-Line Power Supply Mods Kit!