is it possible to rebuild old c64 hardware enhancements?

Joachim> But at the expense of convenience, the SDHC parport Joachim> interface would be super simple and thus cheap. In fact, Joachim> the minimal implementation would require: - DB25 parport Joachim> plug - protoboard - 6 resistors - a way to connect a SD card Joachim> (could be soldering pins directly to a SD-microSD converter Joachim> and one can still swap microSD cards) - some wire ... I'm not sure about "super simple". I think SD cards have an MMC compability mode that's pretty simple (I2C, or SPI, one of those). But that's a legacy ultra-slow interface. The "real" SD interface is a 25 Mbit/second (or 50 Mbit/second in high speed mode) packet oriented serial interface. Yes, you can construct those packets in software, but you can't do bitwiggling in software at those kind of clock speeds... paul