another note: 

what's even stranger is if i put a halt right before and after the
offending access, and just hit 'c' on the chevron the couple time, it works 
(more or less) fine, and doesnt crash at all. anybody have an idea what is
causing this? 

tia,
happy hacking,
isildur

On Sat, 23 Jun 2001, Lord Isildur wrote:

> 
> a little off topic, but..
> 
> does anyone have any ideas why when i frob the bits to set status on a 
> TMSCP controller, bad things would happen? it seems that somehow this
> is causing the PSL to get the 'running on interrupt stack' bit set,
> (actually , it is causing a very different psl status to be set)  
> which then causes a crash to the chevron with ISP ERR, from an access 
> violation. it's happening while probing tmscp devices on a Qbus. I dont
> have any documentation other than kernel sources for whether this should
> generate an interrupt or something which might set the PSL. does this
> make any sense to anybody? 
> this is part of my 4.3tahoe on the 4000/600 work, i had hoped that the
> Qbus, etc, would be identical to ka6[35]0.. 
> 
> Isildur
>