IRQHack64 is a C64 cartridge designed to be used to load programs to C64. It's composed of an arduino pro mini, a micro sd card module and a 27c512 eprom mainly. It's very fast, faster than most of the fastloaders actually. It loads programs at speed of around 40KB per second. It doesn't have an IEC interface so it operates only with program files.
 
It also has these features
Loading program files using serial connection on the arduino pro mini
Autobooting selected program file (Or files with the bundled keybooter.prg tool)
POC : Streaming data from sd card to specially crafted programs. There is no size limit, a program can request up to 65536 different files, be it data or another code to jump to (no size limit!)
POC : 11Khz wave playing
POC : 160x80 - 5fps multicolor video playing. Again there is no size limit for the videos and a program can request to play certain video from sd card.