Differences between version 16 and predecessor to the previous major change of MiscHardwareNotes.
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| Newer page: | version 16 | Last edited on Tuesday, March 16, 2004 11:15:47 am | by JohnMcPherson | Revert |
| Older page: | version 9 | Last edited on Thursday, May 29, 2003 3:11:35 pm | by PerryLorier | Revert |
@@ -1,11 +1,5 @@
This page is mostly here for my reference, and to vent as I couldn't find this information anywhere else (ie google).
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-! [IBM] Thinkpad Laptop External Microphone
-Some (or all?) thinkpads (such as my Thinkpad 600) have non-standard microphone sockets. They expect an external microphone to either be powered, or to make contact with a metal ring surrounding the socket, which supplies +5V, and give it to the "tip" of the jack. This is discussed at [http://www.pc.ibm.com/qtechinfo/LWIK-3QZJKZ.html?up=unknownuser]. If you plug in a regular, un-powered microphone then nothing will happen.
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-! [IBM] Thinkpad Simple Boot
-Thinkpads in the 600-770 series have a "simple boot" flag which is really a PNP OS=no flag. You should ''disable'' it for Linux 2.4, at least if you want the sound to work. Change the BIOS by pressing and holding F1 ''before'' you power up the machine, and hold it until the BIOS screen appears. The simple boot flag is under the Quick Boot icon.
! US Robotics Modem Power Supply
I had two USR modems in a bag without realising that their power adapters were different voltages, and which went with which is not documented anywhere. So for the benefit of anyone who needs to know, the 20 volt pack works with the 33.6K Sportster Voice modem and the 9 volt pack works with the 56K Voice modem. ''Disclaimer: if I have got this wrong, and this causes you to burn down your house, it's not my fault.''
@@ -27,4 +21,7 @@
! MVP3 (super socket 7, K6-2) chipset motherboards
Some motherboards using this older chipset have small L2 caches, meaning if you have too much RAM then performance will become very slow when it is in use. The boards with 512KB can only cache 128MB, and the boards with 1MB can only cache 256MB, so if you are using ram above that limit then all memory reads/writes will take a lot longer.
''Theres reference for mother boards that do this that you can turn the uncached memory into very high speed swap space. This means that as long as your working set is inside your cachable memory then your computer is very very fast. Anyone know if you can convince Linux to use swap in preference to disk I/O? (ie: swap out disk cache onto a faster medium such as this 'high' memory?) -- PerryLorier''
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+! Power Supply
+If you want to blow up your power supply unit, simply forget to plug the connector into your motherboard after changing it, then plug the power into the wall. (This was a 230W Hyena brand [PSU] by the way). Update - it appears a capacitor blew its cover right off. See [pretty picture|http://www.wlug.org.nz/archive/images/psu.jpg?] Update2: it appeared to have damaged the [IDE] [HDD] as well! Moral of the story - don't buy Hyena brand power supplies.
