Category : Tutorials + Patches
Archive : TXTFILES.ZIP
Filename : IRQ-AT.TXT
Output of file : IRQ-AT.TXT contained in archive : TXTFILES.ZIP
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The AT supports 16 levels of interrupt, with 11 channels
bussed to the expansion slots. Two Intel 8259A controllers are
used, with eight channels per chip. The interrupts from the
second chip are cascaded through IRQ 2 on the first chip.
Interrupts 0, 1, 2, 8, and 13 are NOT on the bus connectors and
are not accessible to expansion adapters. They are used as
follows:
NMI -Parity Check
0 - Timer
1 - Keyboard
2 - Cascaded Interrupts from 2nd 8259 (IRQ 8-15)
8 - Real Time Clock
9 - Redirected to IRQ 2
10 - Reserved
11 - Reserved
12 - Reserved
13 - 80287 Co-processor
14 - Fixed Disk Controller
15 - Reserved
3 - Serial Port 2 (COM2:)
4 - Serial Port 1 (COM1:)
5 - Parallel Port 2 (LPT1:)
6 - Diskette Controller
7 - Parallel Port 1 (LPT2:)
Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!
This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.
But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/