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Re: Help about installing NetBSD on a VAXstation 4000/90 (Cougar)
Am 03.05.2018 um 14:17 schrieb Silas:
> I was sure S3 was at the right position until I talked to Ragge. The
> button is sunken and I cannot change it. A picture here:
I have seen many of these switches in bad condition, no idea why people
think they must use brute force to toggle them... :)
> What I thought before:
> * The LCSPX card is faulty and nothing appears on the console. If I
> remove the card I can access SRM via the console -> so S3 switch
> might be at the right position.
> What I'm thinking now (after investigation and sugestions from
> * The S3 switch might be at the wrong position and that is why I
> don't get any output from the console if I have LCSPX plugged in. If
> I remove the LCSPX card, the system falls back to console as default
> input/output device and that is why I can access SRM via console.
You probably nailed it.
> I'm in the process of reading the VAXstation 4000/90 documentation
> and see if I can override the S3 button state somehow.
Interesting point. Look for 16-bit "Configuration Register" (CFG) at
physical address 0x25800000. Bit 3, ALCON, reflects the "Alternate
Console" S3 switch, and is 1 when the serial console is to be used. See
KA49 Processor Module Specification V 1.1, chapter 5.2.
However, the CFG register is described as read-only!
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