Category Archives: Soldering

vTech Laser 128E/EX/EX2 memory expansion card:

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This is a clone of memory expansion card for Laser 128E, EX and EX/2 models, 702175 Rev.C – made by Renee Harke. It’s not compatible with the FIRST revision of 128 but is with the later, 128E. I have the -E revision (later motherboard design with the RAM-expansion port).

It provides up to 1MB of “Slinky” RAM for the Laser 128 aka you can use it as RAM-disk etc.

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See more details a:
https://reneeharke.com/tech/2019/12/31/laser-128-memory-expansion.html?fbclid=IwAR0qxykFwOPGudYMXQEdqquYckDdlJE7JZo2yfnLaZVZBsJCILKgBvyK0HY

Renee sells this either as a kit with all parts included or fully soldered ready-to-be-installed.

I bought this as a kit with all parts included because soldering is fun!

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After soldering (took few evenings as i didn’t have the time to put on this project in one-go) i used the quite handy tool sold in ebay (few euro’s) that bends the IC-legs (it has two different sizes) to correct angle – so they are easier to install to the sockets.

 

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I had removed the metal shield already as it’s pain to install back .. so installing the card was pretty easy and straightforward. Renee even included the 3 little screws needed for installation – that’s nice detail and good thinking.

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Installing the case back together is slightly more frustating compared to //c – even it’s very similar design. I’m really not a fan of the plastics vTech used…

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Also need to configure the Slot 5 as “INTERNAL” for the RAM.

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The internal RAM test can be found from the monitor (CALL-151) and then typing C50AG  … i was happy my soldering was successfull…. it worked!

 

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..and it was seen by the ProDOS as correct size.

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FinApple 2020 (c)
Apple II Forever.

 

 

 

 

Ramworks III repair

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My good old AE RamWorks III card that i had used with several Apple //e’s with the handy VGA-adapter (a2heaven.com), started to give strange graphical errors, kind of missing lines and waves when using 80-column mode. Only in the few top lines of the screen (a2osx shown here).

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Luckily Mr. Plamen Vaysilov figured out quickly what could be done, small mod of soldering capasitor of 22-33pf (of any voltage) could be just soldered and get it fixed. It however took few weeks to get the part as just my local electronics supplier had IT-system issues and they were forced to close their shop… Luckily most hobbyists have other projects too so it was’t that much of a big deal, just shift of focus for other things.

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But later i got the parts and i soldered 27pf capasitor as shown. Might not be the best of soldering work but it works… Yeah the legs could be.. shorter.

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No more missing lines or waves. 

 

FinApple 2019 (c)
Apple II Forever.