I de-soldered the original chip from the memcal as said in Traxions article. That was actually pretty easy, did it in about 5 minutes or less. The problem is soldering the zif adapter onto the memcal. When the zif adapter is on the memcal there is no way I can see to solder the legs to the memcal, it's too low. Even using the pointy soldering tip from the article it can't get in there. Even if the tip did fit there would no room to get any solder in there. I was going to JB Weld the adapter to the memcal without solder but before doing so I checked the continuity and a few legs weren't making contact so I'm back to soldering. Maybe I'm going about it the wrong way. How did those of you who made this modification do it?

 

The problem is soldering the zif adapter onto the memcal. When the zif adapter is on the memcal there is no way I can see to solder the legs to the memcal, it's too low. Even using the pointy soldering tip from the article it can't get in there. Even if the tip did fit there would no room to get any solder in there

I had the very same initial result, and not being an electronics tech, was not sure how to proceed. What I finally did was to bend the ZIF legs outward so that the soldering tip could reach them. This left the ZIF higher on the MEMCAL (since the legs were no longer seated in the holes left by the removal of the eprom), and gave the iron tip more room. Then, I soldered a leg that I could get to on each side of the ZIF to stabilize the assembly. After that, I reached under the ZIF with a thin screwdriver and alligned the legs one at a time and soldered them in. The legs wind up being attached to the "outer" row of contacts, whereas the eprom was soldered between the outer and inner rows. So far, this technique has resulted in a fairly solid assembly. Of course, I still had to check the continuity of each leg, and resolder some of them.
Hope this helps!

 

I had the same problem. Then............
I applied solder ***** to each leg and using a heat gun(not a hair dryer) I carefully heated evenly each side untill the little ***** flowed because a heat gun will melt solder. Never had a problem after that.

 

I took a small file and filed out the plastic on the memcal in each row to gain access for the soldering iron. Worked well, haven't had any problems with it.

Sparks a flyin'