Seiriakes kai irq (was : Re: linux-greek-users-digest V1 #185)

[I.Ioannou]

On 18-Dec-97 Tsakiris Yannis wrote:

> de mporw na katalabw giati de mporw
>na doulepsw tin prwti seiriaki. mono ti defteri pou tin exw sto pontiki.
>mipws epidi com1 kai com3 exoun to idio IRQ ? (ana8ema ki an kserw ti
>einai afto to rimadi to IRQ bebaia..) Genika afta ta pragmata me tis

IRQ = I(nterrupt) R(e)Q(uest) : otan erxetai ena byte sthn seiriakh
sou, gia na mhn xathei, ayth stelnei ena shma sthn CPU, ena IRQ. H CPU
(simfona me proteraiothtes panta) stamata oti kanei, kai trexei ena 
programma eksiperethshs ths IRQ - kai paei kai sozei to byte.

Tora oso afora tis seiriakes multi-io , o mpouzoukokefalos pou sxediase
to ISA, ebale to IRQ ths 1hs na einai idio me tis 3hs, kai 2hs me 4hs. 
Ayto shmainei oti den mporeis na exeis mazi 1+3, h 2+4, apla kai mono
giati tha mpourdouklonontan metaksi toys - diladi tha kanane conflict 
(To irq dinetai meso enos kalodiou - pia seiriakh tha tou dosei tash
kai pia oxi ? Kai h CPU pos tha kserei pia to esteile ?)

Ayta se apla logia.
---
I.Ioannou (roryt at hol.gr)
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