Amstrad PC - Programming 1512 Graphics

The 1512 had a strange 16 colour 640x200 graphics mode that was an extension of the CGA mode 6 (640x200 in 2 colours) but wasn't quite an EGA mode though it did use four colour planes (Red, Green Blue and Intensity) a bit like EGA. The following are very technical details for anyone who wants to try and program it..

OK, the way it works is basically this. CGA already has a standard 640x200 b/w mode which is set with int 10h setting mode 6.

When you first switch to this mode all four