🚀 go-pugleaf

In article <1992Jul31.093843.10058@kullmar.se> henryg@kullmar.se (Henry Gessau) writes:
>Newsgroups: comp.os.msdos.programmer
>Path: exucom.exu.ericsson.se!ericom!sunic!seunet!kullmar!henryg
>From: henryg@kullmar.se (Henry Gessau)
>Subject: IRQ 9 instead of IRQ 2 on ISA bus
>Message-ID: <1992Jul31.093843.10058@kullmar.se>
>Summary: IRQ 9 mapped to IRQ 2 on ISA bus?
>Keywords: IRQ ISA bus interrupt detection
>Organization: Firma Bo Kullmar Datakonsult
>Date: Fri, 31 Jul 1992 09:38:43 GMT
>Lines: 15



> 
>Someone told me the other day that some (most?) PCs with an ISA bus
>have the IRQ 9 signal connected to the pin on the bus slots that is
>designated for IRQ 2. This is quite a logical thing to do as there is
>no point in having IRQ 2 on the bus for AT class machines.
> 
>How common is this?
>Can it be detected by software?

>-- 
>Henry Gessau          henryg@kullmar.se
>-- 
>Henry Gessau          henryg@kullmar.se

It is very common.  In fact, most EGA adapters use IRQ 2.  About s/w, I don't
know if it is transparent or not.
                                                                                        "This must be Thursday.  I never could get the hang of Thursdays"                                                                     - D Adams
  - Patrick Taylor
    Ericsson Network Systems                                                        exuptr@exu.ericsson.se             "Don't let the .se fool you"                 alternately, exuptr@ZGNews.Lonestar.Org