|BBC display extensions|
|Clwyd Technics Palette Extender||StarDot thread
|Clwyd Technics Palette Extender, 1983.
12-bit palette extender, plugs into the User Port. The Palette demo on the Chameleon programs disk will control the Palette Extender.
|12-bit palette extender, plugs into the Video ULA socket. Not currently known how it is controlled.|
|Advanced video extension system, plugs into the 1MHz port.|
|Chameleon 12-bit palette extension||chameleon/gif
|Chameleon colour board, Mike Cook's version of the Clwyd Palette
Extender, Micro User Feb 1990.
Palette demo on programs disk updated to also program the VideoNuLA or use native VDU 19 calls.
|Border colour module||Border||A small module that plugs into the Video ULA socket and provides a programmable border colour at location &FE22. b0-b2 are written with the 3-bit RGB colour, written as %00000bgr.|
|VideoNuLA 12-bit palette extension||StarDot thread
|Rob Coleman's VideoNuLA replacement Video ULA provides a 12-bit palette
in a similar manner to the WildVision PaletteMate, and also provides
extended screen MODEs.
YouTube video demonstrating software and hardware MODE extensions.
This uses the v1.02+ nULA drivers, patched to put the MODE numbers in the standard VDU order.
|Extended BBC screen MODEs||NewModes||Extended screen MODEs for BBC/Master. MODEs 8-14 with twice the colour
depth of MODEs 0-6.
YouTube video demonstrating software MODE extensions.
|VDU19 API||vdu19.txt||VDU19 API specification. Any code to provide extensions to VDU19 must follow this API.|
|VDU19 extension||vdu19.src||Source code to extend VDU 19 to program the Chameleon or VideoNuLA to select 12-bit RGB colours, and to select border colours.|
|LDPIC, SVPIC, RGBEDIT||Graphics||Updated Acorn User LDPIC that supports 12-bit palette, and tool to edit palette files and 12-bit palette in a LDPIC file.|
|PCHANGE||Palette change demo program, selects between programming the palette with native VDU 19 calls, Chameleon/PaletteExtender and VideoNuLA.|
|Non-complementary flashing colours||flash
|Short program to demonstrate flashing colours between any two colours
(eg blue/green, black/red, etc), not just between complementary colours
(eg blue/yellow, black/white, etc.).
Source code to create VDU 19 extension to implement VDU 19,l,32+n,0,0,0 and VDU 19,l,48+n,0,0,0 to set flash colours independently.