Mode 0 Is The Multicolour Graphics Display; Mode 1 Is The ‘Standard’ Or Default Mode - AMSTRAD CPC464 User Manual

Mode 0: 20 columns x 25 lines, 16 INK text
160x200 pixels, individually addressable in 16 colours
c) High Resolution mode
Mode 2: 80 columns x 25 lines, 2 INK text
640x200 pixels, individually addressable in 2 colours
As you can see, the difference is in the number of individual horizontal ' elements' of the display. Not
to be confused with the small stripes on the face of the TV tube which are a separate feature of the
TV monitor hardware.
Each of the three different displays is referred to as the screen or display MODE , and only one mode
may be displayed at any given time using BASIC. Changing mode causes the screen to clear
completely - including all text and graphics windows (the same effect as a CLS and CLG command),
but does not affect the contents of the program memory.
Mode changes may be invoked from BASIC programs, or they may be entered using the direct
commands.

5.2.1 MODE 0 is the multicolour graphics display.

16 of the 27 colours available can be displayed simultaneously. The display consists of 160 pixels in
each horizontal row, and 200 in each vertical column. A plan of this grid appears in Appendix VI.
In MODE 0, there are 20 characters on each of 25 lines.
5.2.2 MODE 1 is the ' standard' or default mode.
MODE 1 is pre-set when the CPC464 is turned on. 4 of the 27 colours may be displayed
simultaneously - although you can switch rapidly through all 27 if you want. The display is 320
pixels wide, by 200 high. A plan of this grid appears in Appendix VI.
In MODE 1, there are 40 characters on each of 25 lines.