[img] BBC display extensions
MDFS::Info.Comp.BBC.Display Search

Chameleon 12-bit palette extension  chameleon/gif
chamel1.txt
chamel2.txt
chamel.ssd
schematic
article text
 
programs
Mike Cook Chamelion colour board, Micro User Feb 1990.
Palette demo on programs disk updated to also program the PaletteMate or use native VDU 19 calls.
Palettemate 12-bit palette extension  StarDot thread   Being developed by RobC on StarDot.
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.
VDU19 extension vdu19.src vdu19.txt API notes
Source code to extend VDU 19 to program the Chamelion or Palettemate to select 12-bit RGB colours, and to select border colours.
  PCHANGE   Palette change demo program, selects between programming the palette with native VDU 19 calls, Palettemate and Chamelion.
Non-complementary flashing colours  flash
flash.src
flash54.gif
  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.
Millipede Prisma      Advanced video extension system.
Extended BBC screen MODEs  NewModes   Extended screen MODEs for BBC/Master. MODEs 8-14 with twice the colour depth of MODEs 0-6.

Authored by J.G.Harston
Last update: 10-Jul-2017