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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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PS/2-to-AT keyboard adapter
Hi,
Do PC keyboards with "AT" connectors (the big 5-pin DIN plug) use the same voltage levels and signalling as keyboards with PS/2 connectors? Will a PS/2 keyboard work if I cut off the PS/2 plug, solder on an AT connector, and plug it into an old PC? Otherwise, where do I get one of these? (Jameco P/N 189771): http://www.jameco.com/webapp/wcs/sto...gDrillDownView (Despite being listed as available, it is not.) |
#2
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PS/2-to-AT keyboard adapter
Hi Chris,
Chris Giese wrote: Do PC keyboards with "AT" connectors (the big 5-pin DIN plug) use the same voltage levels and signalling as keyboards with PS/2 connectors? Yes -- more or less. I.e., given that you are connecting to an "old PC", don't expect any of the "magic buttons" common on newer keyboards to work. In fact, don't "expect" anything from them (including expecting them to be IGNORED). There are a couple of different keyboard interface protocols that the keyboard controller will/should support. Depending on how ancient your PC is, how the BIOS handles them may vary. Be advised many *OLD* machines didn't tolerate the keyboard being unplugged/plugged while powered on (older keyboards consumed more power and this often lead to the keyboard fuse -- in the PC -- blowing; doubtful a problem with a newer keyboard). Will a PS/2 keyboard work if I cut off the PS/2 plug, solder on an AT connector, and plug it into an old PC? Depends on what you call "old". E.g., I have still some Compaq Portable III's here (286 lunchbox). Otherwise, where do I get one of these? (Jameco P/N 189771): (Despite being listed as available, it is not.) Your local computer supply place will have them. Maybe even rat shak. |
#3
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PS/2-to-AT keyboard adapter
Oops. You did choose the right adapter after all. I got it wrong
because all my good keyboards are the AT type with the big plug, so I never assumed anybody would need an adapter for an AT motherboard. |
#4
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PS/2-to-AT keyboard adapter
D Yuniskis wrote:
don't expect any of the "magic buttons" common on newer keyboards to work. Ah -- an added bonus Depends on what you call "old". E.g., I have still some Compaq Portable III's here (286 lunchbox). The system in question is a Pentium 1 with 16 meg of RAM. Your local computer supply place will have them. Maybe even rat shak. OK, I'll take a look. Thanks everyone. |
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