How to erase a cart's SRAM - Here
Transplanting Virtual Boy ROMs - Here
List of Manufacturers IDs on ROMs - Here
Virtual Boy Cartridge Pinout - Here
Technical Specs
CPU : 32-Bit RISC CPU running at 20 Mhz
DISPLAY : 384 x 224 with 4 shades of red and 32 levels of intensity
SOUND : 16 Bit Digital Stereo Sound
WEIGHT : ~5 lbs.
CARTS : 4, 8, and 16 MBit carts were used