On Thu, 2023-03-02 at 09:06 +0000, David Woodhouse wrote: > Back in the mists of time, before IBM PS/2 came along with MCA and added > per-pin level control in the ELCR register, the i8259 had a chip-wide > level-mode control in bit 3 of ICW1.
Actually... I think MCA might have been level triggered system-wide, and still used this LTIM bit. Per-pin control via ELCR probably came in with EISA?
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