Juniper Systems Allegro DOS Manual - Manual (Page 250)

Page 8-16 Software Developer's Guide for DOS
Subfunction: AL = 15h (set auto suspend duration)
This subfunction requires an input value to set the auto suspend
duration. The input value is passed in the BL register. There is no
output.
If BL = 00h auto suspend is disabled 08h duration = 40 min
01h duration = 5 min 09h duration = 45 min
02h duration = 10 min 0Ah duration = 50 min
03h duration = 15 min 0Bh duration = 55 min
04h duration = 20 min 0Ch duration = 60 min
05h duration = 25 min 0Dh duration = 65 min
06h duration = 30 min 0Eh duration = 70 min
07h duration = 35 min 0Fh duration = 75 min
Subfunction: AL = 16h (set video contrast)
This subfunction requires an input value to set the video contrast ratio.
The input value is passed in the BL register and has a range of 00h to
63h. Returns nothing.
Subfunction: AL = 18h (get performance level)
The purpose of this function is to read the current performance level.
Output: AL = 00h
miser
01h low
02h medium
03h high
04h hyper
Subfunction: AL = 19h (set performance level)
This subfunction requires an input value to set the performance level.
The input value is passed in the BL register. Valid register values are
shown below.
BL = 00h miser
01h low
02h medium
03h high
04h hyper
No value is returned to the AL register.
❖ Note: If the eighth bit is set (e.g., 1XXXXXXX, X = 0 or 1), the system is
put into a low power mode (i.e., "sleep") until a system timer tick occurs which
restores the system to normal power. Timer ticks occur once every 55
milliseconds. The performance level is not changed when the sleep function is
called. It is commonly used in applications to save power while waiting for a
keystroke.