Sharp MZ-800 - Appendix A Display Control in the MZ-800 Mode; (1) Graphics memory; (2) 40-column mode and 80-column mode (Character display); (3) Display modes (Graphics display)

Appendix A_ Display Control in the MZ-800 Mode
(1) Graphics memory
The standard MZ-800 supports a display screen of 320 x 200 dots in 4 colours selected from a possible
16 colours, or a monochrome display screen of 640 x 200 dots.
By installing the optional graphics memory (MZ-1R25), the display capability is improved so that a
display screen of 320 x 200 dots can be displayed in 16 colours or a screen of 640 x 200 dots can
be displayed in 4 colours selected from a possible 16 colours.
(2) 40-column mode and 80-column mode (Character display)
The number of character columns per line can be switched between 40 and 80 characters with the INIT
command,
(3) Display modes (Graphics display)
The resolution and number of colours which can be displayed at any one time differs according to
the display mode. The MZ-800’s display modes are as follows,
Mode | Resolution [Characters per line, Colours
1 | 320 x 200 dots “0 | 4 colours
2 | 320 x 200 dots 16 colours
Foreground and back-
ground colours
3 640 x 200 dots
80
4 |640 x 200 dots
4 colours
Modes 2 and 4 can be used only when the optional graphic memory is installed. The graphics display
mode is set by the Mn parameter of the INIT command.
For exmaple:
INIT “*CRT:M1""..
INIT “CRT:M2"’..
. Sets mode 1.
- Sets mode 2.
(4) Colour palette
The colours which can be displayed at one time are selected from the colour palette. The colour palette
allows the selection of 4 colours from a possible 16 colours. The 16 colours which can be displayed
are listed below along with their colour codes.
A-2