18 Apr
2007
18 Apr
'07
5:34 a.m.
On 4/17/07, 9000 VAX <vax9000 at gmail.com> wrote:
On 4/17/07, Al Kossow <aek at bitsavers.org> wrote:
Well, my guess is conformed. I observed the QBUS with a logic analyzer and
it seemed the VMS 6.1 installer issued IPW to reset the controller, and
after it read SAR=0x0b40, it wrote SAW=0xa4ff. Then it read SA port at
12.2ms after that, then again at 12.8ms as a second chance, expecting
0x10a4, before it issued IPW again at 12.88ms. My controller had not updated
SAR before the second chance.
The fix seems to be easy. I just need to make sure the controller is able to
update the SAR register quickly. Maybe it is as simple as removing some
printf()'s.
vax, 9000
any new news on that?
One possibility is that the controller did not place fast enough in SA
register the value CPU was looking for. I need several days to calm down
before I look at this problem again.