Get rid of a couple of copies of the CC0 text. Add header comment to
CC0 files to remind people editing them what the terms are. Also add
some missing XML headers. The header comments in layouts won't bloat
the binary - they get stripped out before compressing, same as any other
comments.
* Started graphics refactoring
* myb3k.cpp: refactored graphics circuit and added color in 320x200 mode
* myb3k.cpp: fixed speed issue by reducing CPU clock by 50% as suggested by RAM waitstates in the schematics where the CRTC uses the other 50%
* myb3k: fixed text scrolling
* myb3k: -ramsize now supported with 128K option and 256K default
* myb3k: 80 character mode added, eg 640x200
* Emulate the INT7 pull down and up for the keyboard. Initial support for JB3000 keyboard.
* myb3k: Added hi-res 640x400 mode and crude cursor support for 40 character mode
* Keyboard improvements using BACKSLASH2 keycode.
* myb3k_fdc.cpp: addressed review comment
* myb3k.cpp: Added initial monochrome monitor support
* myb3k.cpp: Adjusted the monochrome color palette to match the 525Nm of P39 phoshor in the Ericsson DU4721 monochrome monitor
* myb3k.cpp: added printer support and completed interupt support including jumper settings
* myb3k.cpp: Added softlist for Ericsson step/one
* myb3k.cpp: cleanup and srcclean:ed
* myb3k.cpp: Fixed crude support for 36x25 color text mode
* Fixed build
* myb3k_fdc.cpp: fixed review comment
* mybr3k: fixed DOS 2.11 boot in 256KB mode
* myb3k.cpp: Added graphics mode 0 which have the peculiar characteristic of different resolutions depending on the monitor used (2 connectors)
* myb3k: Separated keyboards into separate device implementations.
* myb3k: addressed review comments
