ביום רביעי, 14 באפריל 2004, 23:44, נכתב על ידי Arkady V.Belousov:
> Hi!
> Because DOS is not reenterable (you can't call most DOS function from
> inside TSR, when TSR gets control at time of DOS working), you should check
> when DOS is in idle state (see INT28 description).
>
> Also, there are other issues, related to hardware interrupts: when
> INT8 calls INT1C, it not acknowledge timer interrupt, so, until you return
> from INT1C, your system will/can not receive other interupts (timer,
> keyboard, etc).
OK.... nice, still good to learn new DOS stuff :)
Now, it seems like all I need to do is to trap the 28 interrupt instead of 1Ch
or 8 (a 1 line patch). I did this and the interrupt is not called. I am still
missing something.
Another thing:
Looking inside the kernel in file chario.c in function: read_char_sft_dev, I
see this code:
if (check_break && *pdev != syscon)
check_handle_break(&syscon);
/* the idle int is only safe if we're using the character stack */
if (user_r->AH < 0xd)
DosIdle_int();
and also:
http://www.ctyme.com/intr/rb-2739.htm
Apparently I have to pass a pointer to a byte to the DOS and set that byte to
1? I think I am lost, that "manual" is not that usefull. :(
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