My latest project is called SDD 99 and is both a multi-function expansion card and a PEB replacement. It's currently in the prototype stage and about 80% complete.
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The SDD 99 features an SD-card based disk, 32 or 64 MB of SAMS-compatible RAM, Wifi and a remote file server, and various ports. This video shows how to use the SDD 99, but be warned, I suck at YouTube.
The SDD 99 uses an ARM Cortex M microcontroller and one SDR SDRAM IC. Programming the Cortex M has been both a breeze, and a nightmare. It's been super easy to create logic such as the cartridge emulation, but dealing with its peripherals such as SD, RAM, and Wifi has been major stumbling blocks that cost me months.
I started this project end of last year, mostly since I wanted to see what a Cortex can do. Of course I'm fully aware that TIPI has long since been released, but I never meant to compete with or best TIPI. In fact, I abstained from AA for the past view months, since I didn't want to learn too many facts about TIPI.
So, I'm aiming for completing this by next spring, but of course my original plan was to show the prototype in May.