linux/Documentation/userspace-api/isapnp.rst

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ISA Plug & Play support
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Interface /proc/isapnp
======================

The interface was removed in kernel 2.5.53. See pnp.rst for more details.

Interface /proc/bus/isapnp
==========================

This directory allows access to ISA PnP cards and logical devices.
The regular files contain the contents of ISA PnP registers for
a logical device.