ACT apricot - Page 278

CONTROL DEVICE
Specification Of The Apricot Control Device
a. Screen Driver
The Screen driver can easily be accessed by using this
configuration call:
DEV-49
COM-Oto2
DAT-Oor 1
COM = 0:
Return the current status of the video display - RET
returns 1 if no display is connected, or 0 if it is.
COM = 1:
Get or set text and graphics mode. If DAT = 0, then the
Text mode is selected, or if DAT = 1, the graphics mode is
selected.
COM = 2:
Switch the screen display on or off. If DAT = 1, the screen
display
will be switched off, or if DA T = 0, the screen
display
will be switched on.
b. The keyboard driver
This option allows the programmer to set the Auto
Repeat Key status, as defined under the Keyboard section.
DEV-50
COM-Oto5
DAT - variable
COM = 0:
The keyboard status will be returned in RET i 0 means
that the keyboard is connected AND is a valid ACT Apricot
Keyboard, 1
means that there is no keyboard connected.