Juniper Systems Allegro DOS Manual - Manual (Page 122)

122 Allegro DOS Owner’s Manual
Allegro Get Keystroke Function (Allegro_Getch())
The following function can be used to put the Allegro to sleep while
waiting for a keystroke.
char Allegro_Getch(void)
{
while(!kbhit()) // do sleep function until key is pressed
{
_asm
{
push ax
push bx
mov
ax, 2F19h
mov bl, 10000000b //load regs for sleep call
int 10h //call sleep function
pop bx
pop ax
}
}
return(getch());
}
Allegro CPU Busy Function (Allegro_CpuBusy)
This function overrides the Power Manager and causes the CPU to
enter a high power state. It remains in this state until the Allegro_
CpuDone function is called. It is used to temporarily speed up the
CPU when data needs to be processed rapidly.
void Allegro_CpuBusy (void)
{
_asm
{
push ax
push bx
mov ax, 2E0Bh
mov bl, 0 // setup regs for function call
int 10h // call cpu busy function
pop bx
pop ax
}
}
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