Digital Equipment ALPHA PC Посібник користувача Expert - Сторінка 2
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If you want to boot directly from the keyboard and display the procedure is the same, except that you set the keyswitch
on the front of the machine to the unlocked position. The glass-terminal screen is 640x400, so it will come up on just
about any VGA monitor.
Reconfiguring the Hardware
We put the controller on SCSI id 7 and the local disk on SCSI id 2. The internal SCSI cable is terminated at one end by
the RZ25 and at the other end by 3 resistor packs on the SCSI controller. The resistor packs should probably be
removed if you use the external SCSI connector (or you can just do what we do, which is plug it in, and hope that it
works, which it usually does). If you decide to remove the terninators they are located on the SCSI board right along
side of the 50 pin connector that goes to the internal disk cable. There are 3 of them, they are yellow, and they are in
sockets (there are actually 4 of them in a row, but the fourth one isn't a SCSI terminator, and isn't in a socket). Just pull
them out with small pliers. If you plug them back in pin 1 (marked with a dot on the package) goes toward the front of
the machine.
The keyboard handler should be able to drive most AT compatible keyboards, so if you can't stand the one you get,
you can go buy another and try it. Like everything else in the IBM PC world, there is no real specification for the
keyboard, so it is possible that some keyboards will not work.
Reconfiguring the Software
NFS works fine. When mounting NFS filesystems set the read and write sizes to 1024 or you will overflow the (puny)
packet buffers in the Western Digital controller, and get lots of errors.
Hints
Most users boot off the serial console, check the file systems, then move the keyswitch to the unlocked position and
bring the system the rest of the way up. This gives them an X11 display to use, but leaves console printf's on the serial
console. This is important, because there are no debugging tools, and often the "pc" and "ra" typed on the console are
the only hint as to what is going wrong when a user program blows up.