Re: DECsystem 5900/260
Simon Burge <[email protected]>
| Newsgroups | gmane.os.netbsd.ports.pmax |
|---|---|
| Organization | Wasabi Systems, Inc. |
| Message-ID | <[email protected]> |
"Maciej W. Rozycki" wrote: > On Fri, 19 Nov 2004, Dennis Grevenstein wrote: > > > > Yeah. Don't forget to jumper the motherboard for the 5000 mode. > > > > What jumper do you mean and why is that necessary? > > It's located in the TC slot 0 area, beneath the option board, if you have > one installed. It should be open for the 5900 and closed for the 5000. > Originally it was apparently meant to be a diagnostic jumper, but when the > 5900 was engineered, it got redefined. Its state is visible as bit 15 in > the I/O ASIC's SIR register. > > I know it's used by Ultrix to differentiate between the two systems; it's > quite possible it's used by the firmware as well, but I can't tell for > sure. It won't hurt to set it correctly anyway. Barring this setting, > there is actually no way to differ the two systems by software means. NetBSD checks the same bit, and it's only used to determine the board name (see sys/arch/pmax/dec_3maxplus.c, around line 210). Unfortunately my 5900 has a fried power supply. Anyone know if you can somehow transfer the innards of a 5000-style PSU in to a 5900? Simon. -- Simon Burge <[email protected]> NetBSD Support and Service: http://www.wasabisystems.com/