Tag Archives: Randy Brandt

(REPOST) Beagle Bros IIGS

This article was originally published on May 1, 2012

For those who don’t follow me on Twitter or Facebook, I recently came into possession of one of Randy Brandt’s Apple IIGS’s.  According to Randy, this ROM3 was used extensively in the development of AppleWorks and many other totally awesome Beagle Bros programs, including most of the TimeOut series.  The IIGS served its time well and was eventually retired and it lived in a quiet corner of Randy’s office for nearly two decades, until he rediscovered it a couple of weeks ago and dusted it off once again.

Beagle Bros Apple IIGS


Unfortunately, the intervening years weren’t kind to this particular Apple, or more specifically, to the 3.6V battery that lives on every Apple IIGS motherboard.  As old batteries do, this one began to leak and spill its contents across the PCB.  The resulting “goo” (you can read all about the specific chemistry of battery leakage in this Google Knowledge article, if you’re interested) took out a couple of capacitors and left a nasty coating on the MC1377 RGB to composite signal converter IC.

Beagle Bros Apple IIGS - Motherboard Damage


Additionally, the leak spread to the bottom of the motherboard and pooled on the case RFI shielding.

Beagle Bros Apple IIGS - Motherboard Damage


Several of my fellow Apple hobbyists are optimistic that this repair shouldn’t be too difficult, and I tend to agree with them.  The first steps will be to remove the remaining corrosion and assess the MC1377 IC, and to replace the ruined capacitors.  I’ll probably get started this weekend – it would be a shame if an important piece of Apple II history like this couldn’t be repaired, but all things considered, it could be much worse.  I’ll keep you appraised of my progress here.

Beagle Bros Apple IIGS - Motherboard Damage

In the meantime, you can take a look at this Flickr set for more close-ups of the damage.

(REPOST) Beagle Bros IIGS Clean Up–Phase 1

This article was originally posted on May 6, 2012.

Here are some images of the initial clean up efforts on the Beagle Bros Apple IIGS.  You can see that one pin on MC1337 has been completely destroyed, and there is heavy corrosion on several others.  As this chip’s only function is to convert the RGB signal to composite, I don’t know that I actually need to replace it since I never use composite monitors with my IIGS machines.

Beagle Bros Apple IIGS - MC1337


 

There is still quite a bit of “goo” present on the board, and I will need to clean out the pin holes for C44 and C45 before I can replace those caps.  Should be a simple procedure.

Beagle Bros Apple IIGS - Caps


 

And while I’m at it, those expansion connector slots don’t look too healthy either.  Not sure of the corrosion I’m seeing in there is related to the leak, but it never hurts to be sure.

Beagle Bros Apple IIGS - Motherboard Damage


 

You can see the damage to the bottom of the PCB here.  I’m not sure what the white substance is.

Beagle Bros Apple IIGS - Bottom of PCB


 

I’ll continue to keep you updated here, and you can see higher-resolution images in this Flickr set.