Reply 60 of 286, by Gmlb256
mkarcher wrote on 2021-09-10, 16:48:wrote:If no interrupt request is present at step 4 of either sequence (i.e., the request was too short in duration) the 8259A will issue an interrupt level 7. Both the vectoring bytes and the CAS lines will look like an interrupt level 7 was requested
Mmm 🤔, on the datasheet it says interrupt level instead of IRQ channel. If IRQ 7 is indeed dangerous then why first LPT port use it by default and the sound setup on many programs has the option to use it? This is the first time I've ever heard about this.
The main reason I know why sound cards switched to IRQ 5 was because of conflicts with the first LPT port. For example: When one was playing samples on the sound card and said LPT was connected to a printer and currently printing a document. The second LPT port was hardly used.
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