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Index > DOS > Using Timer ( Urgent!!! )

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diegocn



Joined: 17 Nov 2004
Posts: 7
diegocn
Hi, sorry for my poor english Rolling Eyes

I'am creating an simple multtask OS, I need a way to call a user interrupt
each x milisegunds or microsegunds. Can I resolve this?

I have to redirect the timer IRQ to a INT ???
Please help-me with a simple code

Very thanks Smile
Post 17 Nov 2004, 20:26
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ASHLEY4



Joined: 28 Apr 2004
Posts: 376
Location: UK
ASHLEY4
Go here: http://512.decard.net/entries/
and get "nanoos2.zip" , it is a multitasking demo that is only 512bytes and fits on boot sector of floppy, with asm code.

\\\\||////
(@@)
ASHLEY4.

Batteries not included, Some assembly required.
Post 17 Nov 2004, 21:13
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diegocn



Joined: 17 Nov 2004
Posts: 7
diegocn
Ok but the source codes are dificult to understand and generaly uncommented =( Have the http://www.menuetos.org/ too but is complicated
to understand.
But i try nanoos2.zip...

Very thaks...
Post 17 Nov 2004, 21:21
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diegocn



Joined: 17 Nov 2004
Posts: 7
diegocn
No, I dont understand =(
Plase sendme a simple example...
An simple example, each x milisegunds, the program print the
leter (x) in the screen...

Gratefull for attencion,
Diego
Post 18 Nov 2004, 00:50
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diegocn



Joined: 17 Nov 2004
Posts: 7
diegocn
Yesss, I tried to read the source of nanoos.asm and I know...
Very thanks friend.
But I need one more information, in the nanoOS the 18.2/segund
is the timer default. But I creating an real system and need more
than this. I have to modify the PIT ( Programmable Interval Timer ) ok?
But can I chance the PIT inteval?
I know that the ports is 40h and 43h... 40h is the address of timer
and the 43h is the address of Mode control register.

Very thankssssssss =D
Post 18 Nov 2004, 02:09
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ASHLEY4



Joined: 28 Apr 2004
Posts: 376
Location: UK
ASHLEY4
Try these links:
www.contactor.se/~daniel/links/Pctim003.txt
http://members.tripod.com/~ladsoft/

\\\\||////
(@@)
ASHLEY4.

Batteries not included, Some assembly required.
Post 18 Nov 2004, 16:44
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diegocn



Joined: 17 Nov 2004
Posts: 7
diegocn
I programmed and dont function =(((((((
Very thanks for your help I really need

The links dont have effect, its for DOS, and my operating system
dont run in the DOS, is a pure system with loader...

See the code please:

TIMER_IRQN equ (Cool

mov ax, function_timer
mov [0:TIMER_IRQN*4], ax
mov ax, cs
mov [0:TIMER_IRQN*4+2], ax

function_timer:

; code that is executed each 18.2s

jmp $-2

------------------------------------------------
this code not have effects =(((
What's ocorred?

Diego
Post 18 Nov 2004, 20:23
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