Juniper-systems Allegro DOS Manual Instrukcja Użytkownika Pobierz pdf (Strona 131)

Allegro DOS Owner’s Manual 131

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.

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Juniper-systems Allegro DOS Manual Instrukcja Użytkownika Strona 131