27 Jan
2015
27 Jan
'15
3:05 p.m.
From: Johnny Billquist
If it comes as far as booting RSX as well as XXDP,
there can't be
anything seriously wrong with the CPU...
Yeah, I see your point, but why all the zeros, then? That's what I could't
work out.
Anyway, it should be really easy to make sure e.g. ASH, MUL and DIV are
working; it's vaguely plausible that one of them is broken. (Unix V6, I think,
might even boot even if MUL was broken. I know the bootstrap uses DIV, to
calculate the cylinder in the disk driver.) If not, cross that off the list,
and try the next thing... Which is?
Noel