[rescue] Divide and conquer
ajwdsp at cloud9.net
Thu Jul 24 11:55:15 CDT 2003
On Thursday, July 24, 2003, at 12:39 PM, Peter Corlett wrote:
> Andrew Weiss <ajwdsp at cloud9.net> wrote:
>> All PC's boot without a monitor... it's old Macs that don't boot
>> without a
>> display on the sense pins... something that can be fooled with a Mac
>> VGA adapter.
> Ah, I've got a Mac LCII that apparently boots, but nothing comes up on
> display. I've been told that it's because the battery inside is flat
> fact, it's missing :) - would this be the cause, or is there some
YES... many old macs WILL NOT boot if the PRAM battery is dead or
missing. It's like the NVRAM being missing or dead on a Sparcstation.
The Powermacs after the x5xx series contain OpenFirmware of course
which is very similar to Openboot... both are real firmware that have
Forth interpreters... (Openboot?)
>> All PC's I know of won't boot without a video card. (I've heard there
>> rare exceptions, but most machines will just BEEP really loudly
>> without a
>> VGA adapter)
> Are you sure that's a failure, or just a warning?
Failure. The machine stays like that... BEEEP BEEEP BEEEP BEEP...
forever.... no other discernable activity except continuous 3 second
> I agree that they beep loudly when no video card is detected, but they
> often just contine with POST and boot anyway.
>> Many PC's don't boot without a keyboard attached.
> Booting without a keyboard is such a common requirement, I've yet to
> see a
> machine that wouldn't do so when you select the blatantly obvious
> option in
> the BIOS.
Case in point... the HP Vectra VA 6/200 I have at work has no such BIOS
option. I have also seen many others that have no BIOS option to keep
booting on POST errors...or ignore keyboards. I have also seen many
that would allow this.
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