Top Document: Win95 FAQ Part 4 of 14: Hardware Previous Document: 4.9. Using "Safe Mode" to fix hardware problems Next Document: 4.11. Basic PCI Plug & Play theory (Don't bother also) See reader questions & answers on this topic! - Help others by sharing your knowledge A PnP BIOS keeps a record of resources in use through a Non-Volatile RAM (NVRAM), usually part of its Flash BIOS EEPROM. When you add a device, Win95 tells the BIOS to add the resources in use to this list. A BIOS must have these calls available to Win95 or it will never know about what the OS added or reserved. The NVRAM is not the same as CMOS RAM, which makes me wonder why they don't just replace the CMOS with NVRAM for storing other settings, like lost hard drive parameters. Also, when you install a PnP device, the BIOS polls it for the resources it requires. The PnP device will have "Preferred", "Acceptable", and "Marginal" operating resource requirements. The BIOS will assign resources based on what the device can use, and record the resources used in its NVRAM. Win95 can ask the BIOS what resources are in use, and it can ask the BIOS if any new devices exist, which is when you get the "Windows has found new hardware..." message. On a Non-PnP system, Win95 handles all PnP requests by itself and stores config info in the Registry. Buggy BIOSes might not handle cards with multiple devices on it. If you think you have a buggy BIOS, see about disabling its PnP features and let Win95 take over as PnP manager. In this condition, Win95 stores all resources in use in its Registry and polls PnP cards by itself. User Contributions:Comment about this article, ask questions, or add new information about this topic:Top Document: Win95 FAQ Part 4 of 14: Hardware Previous Document: 4.9. Using "Safe Mode" to fix hardware problems Next Document: 4.11. Basic PCI Plug & Play theory (Don't bother also) Part1 - Part2 - Part3 - Part4 - Part5 - Part6 - Part7 - Part8 - Part9 - Part10 - Part11 - Part12 - Part13 - Part14 - Single Page [ Usenet FAQs | Web FAQs | Documents | RFC Index ] Send corrections/additions to the FAQ Maintainer: gordonf@intouch.bc.ca
Last Update March 27 2014 @ 02:12 PM
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