Already good while ago I bought this MMC2IEC kit from Retro-Donald together with other junk. Basically it is just one hardware design variant that runs the popular and widely used sd2iec firmware. Just like the uIEC, SD2IEC, C64SD and many other devices. If you randomly come by an SD card drive for 8-bit Commodores, it’s probably some sort of SD2IEC/MMC2IEC variant.
This particular variant of the hardware goes by name Peter Sieg Platine, Peter Sieg plate. It’s Lars P. hardware configuration – which is important information when flashing or updating the AVR firmware. The kit came with ATMega 1284 AVR – a 128k chip that is likely to fit also the upcoming updates of sd2iec firmware in future.
Anyhow, this one was not a complete ready to use device, but a DIY kit that consists of nothing but the board, the SD card slot and an optional preprogrammed AVR chip. The kit with programmed AVR didn’t cost very much, and the remaining electric components were only few euros from a local electrics shop.
Even though this kit is no longer available from Retro-Donald’s Sinchai shop, I’ll go ahead and run down what I did with mine and how I built it. After all, this device is so simple, that it would be fairly easy to build one without any kit. If you have the possibility to make the PCB and program the AVR, plus solder all the parts together, you can basically make this very device from scratch.