Re: IIgs locking up after 15-20mins, TWGS likely overheating.

[Drew <goggledrew@gmail.com>]

On 1 Sep, 03:54, "Christopher G. Mason" <c...@my-deja.com> wrote:
> On 8/31/2010 12:16 AM, Michael J. Mahon wrote:
>
>
>
> > I'm betting that will work. ;-)
>
> > -michael
>
> > NadaNet 3.1 for Apple II parallel computing!
> > Home page:http://home.comcast.net/~mjmahon/
>
> > "The wastebasket is our most important design
> > tool--and it's seriously underused."
>
> Indeed, and I think I will be settling on 9Mhz for the time being. I
> started testing at 10.5Mhz, 45 mins in the machine locked up. Turned
> everything off, swapped in the 36Mhz crystal, turned the machine back
> on...and nothing. All I could hear is the power supply making a chirping
> noise thats likely the over-current protection kicking in (yes the
> crystal was installed right). Turned everything off again and let it
> cool off more, came back, turned everything back on and ran the machine
> for over an hour with no issues. I still have to test with the cover on,
> but it shouldn't be an issue as the GALs seem cooler at 9Mhz.
>
> So besides heat, its likely my poor 23 year old IIgs power supply has
> seen better days and can't handle the power demands it used to once
> warmed up. Does anyone rebuild these units any more? I seem to remember
> Reactive Micro offering the service. I guess the LittlePower and an off
> the shelf ATX power supply is likely a cheaper/easier solution at this
> point (although not quite as elegant).

The LittlePower adapters are good and recommend using it as also keeps
the main power pack outside the GS (thus reducing heat). I use a
couple of them with some Pico MicroATX powersupplies and ext power
packs. I also have converted a GS PSU with a more modern internal PSU
as others have done. I blogged about it last year..you can check out
the posts at http://tinyurl.com/3a6vsqe.

Drew