Mini Apple IIe Now Fully Functional

A bald white man stands behind a table with an Apple II, a large green PCB, and a modular purple and black development board system. Atop the Apple II is what appears to be a smaller Apple II complete with beige case and brown fake keyboard.

Here at Hackaday, we love living in a future with miniaturized versions of our favorite retrocomputers. [James Lewis] has given us another with his fully functional Apple IIe from the Mega II chip.

When we last checked in on the Mega IIe, it was only just booting and had a ways to go before being a fully functional Apple II. We really love the modular dev board he designed to do the extensive debugging required to make this whole thing work. Each of the boards is connected with jumper pins, which [Lewis] admits would have been better as edge connectors since he should’ve known he’d be unplugging and replugging them more than he’d like.

A set of PCBs sits on a table. There is a logic analyzer plugged into one end that looks like a grey square. Three boards stick up at right angles from the main plane which consists of a purple square PCB with the IIe ROM and MEGA chips and a black rectangular PCB with four sets of headers for PCB modules to slot into.

This modular prototyping system paid dividends late in the project when a “MEGA bug” threatened the stability of the entire system. Since it was confined to the keyboard PCB, [Lewis] was able to correct the error and, swapping for the third revision of the board, everything that had been crashing the system now ran.

There were still some issues going to the final unified PCB that nearly made him give up on the project, but perseverance paid off in the end. Combining vintage chips and multiple RP2040s isn’t for the feint of heart.

Now that you have a more conveniently-sized Apple II, why not teach it some new tricks like digital photography or ChatGPT?

 

One thought on “Mini Apple IIe Now Fully Functional

  1. Fantastic project. Here is one that would be great also – A stand alone card that allows you to plug in old 5.25″ Apple Floppy drives and provides a USB cable that goes to a PC. In this way, you are not running the software on the floppy. Instead, you are just allowing people to be able to make a disc image. Remember that the reader software needs to be able do quarter and half track movement of the read/write head. No one has ever made the above. For a bonus – make it bidirectional. So you can move information to and from the floppies. Or maybe make a 3.5″ floppy disk reader as well. :-) But this was a fantastic project. Glad you got it done. My website is down presently.

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