SBTCVM: now with multiple text modes

For easy comparison, lets look at the latest version of the font test program:

both modes run at 648x486 and have 72 columns


54 line mode uses SBTCVM's older 9x9 font. much more information is able to be on screen at once, but the text itself is much more dense.




The new 27 line mode uses a new 9x18 font. As a trade off of the shorter screen height the text is much easier to read.







this doesn't mean 54 line mode doesn't have its uses. Take the Fibonacci demo for example:



Programs can change the tty mode to suit their needs through the regset system.

in SBTCVM assembly, its as easy as:

TTYmode|54
or

TTYmode|27