VTxxx

VTxxx is a series of systems-on-a-chip made by V.R. Technology in Taiwan. Unlike previous VTxx chips (VT03, VT09, etc), these were not designed with close backwards compatibility with the Famicom in mind, though they may retain some Famicom compatibility.

Chips[]

VT168 - supports full 16-bit colour, two background layers, 256x240 resolution. Main CPU and sound CPU are both 6502, with the sound CPU running at 4x speed of the main CPU in NTSC revisions and at about 5x speed of the main CPU in PAL revisions. Known developers include Waixing, Cube Technology, Nice Code, Wellminds and JungleTac. Used in a number of Wii clones such as the MiWi 2 as well as some handhelds, notably in certain handhelds produced under the Classic Max Pocket name by JungleTac and distributed by various companies - all vertical handhelds in this series use VT168 hardware and contain unique games developed by both JungleTac and Nice Code specifically for the handhelds. No backwards compatibility other than CPU core with earlier chips. VRT seem to mix it with another chip, the VT1682 - the difference between the two is not known. Some VT168 ROMs have two bits swapped (7 and 2) in the opcodes.
VT268 - adds another background layer and a high res 512x240 mode for the sprite layer only, and hardware SD card support. Main CPU is upgraded with 24-bit addressing support. Last VTxxx device with available documentation. Cube Technology list it as one of their platforms. VR Technology suggest it for educational systems, no game consoles confirmed to use it.
VT368 - used in many newer handhelds and plug-and-plays. Example system on VRT's website shows the JungleTac HiQ Classic.^[1] Other known systems include the Lexibook Retro TV Game console, and several newer DreamGEAR systems. Likely has a degree of backwards compatibility with older chips (VT168, VT03 and FC) as some systems include many games from these platforms too. May have the capability to load games including native and NES ROMs from SD card.
VT389 - likely a higher resolution version of VT368. It is only known to of been used in the Interactive TV Shooting Game/Reactor Special Metallic Edition, the DreamGEAR Wireless Video Game Station (200-in-1), and a specific variant of the MiWi (BS-9800).
VT369 - newer than the VT368, neither differences nor systems using it are not known. Though it might possibly have minor upgrades to the hardware. Some systems listed as VT368 may actually be VT369. Both VT368 and VT369 are listed as systems that Wellminds can develop for.

The following chips are rebranded SoCs originating from Generalplus. It is unclear if V.R. Technology were actually involved with them and their presence here is currently speculatory: