13 messages in org.freebsd.freebsd-hackersKeyboard Boot Disable| From | Sent On | Attachments |
|---|---|---|
| Cole | Apr 25, 2006 8:08 pm | |
| Brooks Davis | Apr 25, 2006 8:12 pm | |
| Cole | Apr 25, 2006 8:20 pm | |
| John Baldwin | Apr 25, 2006 8:45 pm | |
| Brooks Davis | Apr 25, 2006 9:06 pm | |
| Cole | Apr 25, 2006 9:51 pm | |
| Lucas Holt | Apr 25, 2006 10:27 pm | |
| Matthew D. Fuller | Apr 26, 2006 10:45 am | |
| Rick C. Petty | Apr 26, 2006 6:12 pm | |
| Alain Hebert | Apr 26, 2006 9:43 pm | |
| Alain Hebert | Apr 27, 2006 1:36 am | |
| John Baldwin | Apr 27, 2006 5:30 pm | |
| Alain Hebert | Apr 27, 2006 6:00 pm |
| Subject: | Keyboard Boot Disable | |
|---|---|---|
| From: | Rick C. Petty (rick...@kiwi-computer.com) | |
| Date: | Apr 26, 2006 6:12:58 pm | |
| List: | org.freebsd.freebsd-hackers | |
On Tue, Apr 25, 2006 at 06:27:53PM -0400, Lucas Holt wrote:
I worked with someone once that said they blew out the ps/2 port on the motherboard. As an alternative, maybe you could consider a kvm switch?
Maybe on an ancient motherboard?? Most motherboards have overvoltage/overcurrent protection circuitry. A PS/2 port is just a glorified serial port: 5v signals vs. +/- 7.5v.
The only problem I've ever had with hot-swapping PS/2 is tricking the OS to reinitialize the device. FreeBSD seems to handle this better than most. Smart KVMs work much better because they keep the virtual device connected, and they keep keyboard initialization state so they can reinitialize the keyboard when it's plugged in again. Even dumb KVMs seem to handle hot-swapping better; likely the onboard logic behaves better than the onboard keyboard controllers.
USB works much better because it guarantees power & ground connection is established before the data pins. Many KVMs buffer the keyboard I/O so it can wait until power & ground are established before trying to send/recv data. I've never blown out a PS/2 port or device, and I hot swap much more than I should...
-- Rick C. Petty