Yes, you read this right. It was for a 16K RAM Expansion Card. This took my computer from 48K to 64K of RAM.
The expansion card came from JDR Microdevices.
This memory upgrade allowed for bank switching of memory so that more of the addressable memory could be used for RAM during normal operation.
Then I had to find a chip at Location 3E on the Memory Array and carefully remove it. The instructions had you use a small screwdriver to carefully pry up both ends. There were very detailed instructions on how to find the chip and remove it.
The card was then plugged into slot zero.
I don’t remember how much I paid for the 16K expansion card, but I know it was more that $100.
A lot of memories as I think back to doing this when I was a teenager. I have a lot of memories of my Apple II+. I used it through college and it wasn’t until about a year after graduation that I finally bought a more powerful computer. The Apple II+ was handed down and was used for many more years by my younger siblings. The 12 inch green monochrome monitor was then used for an even longer time in a sound booth at a church in Jefferson City, Missouri.
A memory expansion card user manual can sure bring back a lot of memories.