Change CEC-I to Enhanced Apple //e
Posted on January 20, 2022 kboo 1 comment
This post is going to introduce how the CEC-I modified to Enhanced Apple //e. We know that CEC-I is actually an Apple //e clone. What modifications required?
Although, CEC-I is an Apple //e clone, there still some differences in the circuitary. It built-in some programs like Chinese system and logo language but other than that CEC-I can only work as an Apple ii+. The main problem is that it does not include an auxiliary slot for 64K RAM expansion. Unfortunately, without the slot for memory expansion, CEC-I cannot run 80 columns and DHGR programs. These pictures and the PDF link shown the steps of the modifications.
Among the steps, the main effort is to design a 64K memory board which works like the AIIE 80 col/64K memory expansion card. Here is the board.
Finally, the performace after such modifications.