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Re: PCI Interrupts
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- Subject: Re: PCI Interrupts
- From: "Ingvar Berg" <ingvar_berg@x400.icl.co.uk>
- Date: Tue, 01 Oct 96 08:18:00 +0100
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Tom Warren wrote:
[stuff deleted]
>Did you unmask the slave PIC (8259) for IRQ 10? You need to clear bit 2,
>port A1h (IN AL, A1h; AND AL, 11111011B; OUT A1h, AL). Do this before
>installing your interrupt handler (ISR).
>
Actually you should do this after installing the ISR. Otherwise the
default ISR will be called, and it usually turns the mask bit on again.
/Ingvar
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