VTxx refers to V.R. Technology's "NES-on-a-chip" Famiclones, some of which having greatly extended capabilities. These capabilities are described in separate articles: VT01 STN Palette VT02+ PRG-ROM Bankswitching VT02+ Video Modes VT02+ CHR Pattern Data Layout VT02+ CHR-ROM Bankswitching VT02+ MMC3...
