Jay:
Try this:
Location Contents Opcode Comment
001000 012700 mov #1,r0 Load 1 into R0
001002 000001
001004 006100 rol r0 Rotate R0 left
001006 000005 reset Initialise bus (70ms)
001010 000775 br .-4 Loop back to 'rol r0'
from:
http://www.psych.usyd.edu.au/pdp-11/11_40.html#chaser
Not sure if it works on all models.
De
On Thu, 12 May 2005 Allison <ajp166 at bellatlantic.net> wrote:
> >Subject: Re: What does PUSHJ do?
> > From: Johnny Billquist <bqt at Update.UU.SE>
> > Date: Thu, 12 May 2005 10:30:31 +0200 (CEST)
> > To: cctalk at classiccmp.org
> >
> >Not a good example. It should really be JMS FOO, and at the label FOO you
> >need to place a 0, which is overwritten by the return address. (What
> >assembler do you usually use, btw? Comments come after a slash... :-) )
>
> Mindeye. Neumonics to octal on paper usually. My 8 doesn't have any
> mass store not even TTY. I plan to take some EEprom and make a RS08
> or other disk equivelent.
Ah! That explains it. :-)
> >Eh? No. The PDP-8/a don't have any stack IOT. Same set as the 8/e. The
> >only difference is how some illegal combinations of OPR instructions act.
>
> I've used one that did. Might have been a hack. The 6120 however does
> and the DEC purchase spec is clear on that too. It's still done with IOTs.
Must have been some additional hardware. One brain cell seems to think
that DEC maybe sold some hardware to implement stacks on the pdp8, but it
might have been the pdp-12 as well.
But yes, the 6120 did have IOTs for that.
I have several PDP-8/A systems around, but no 6120 systems...
Johnny
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
Yes, Andy Goldstein (or whoever, but I think Andy wrote the first
version) really did a nice job in VMS BACKUP. I once wrote a program
to read such tapes on a Unix system and needed to learn the
techniques used. Very nice. Indeed an entire /BLOCK_SIZE block of
data within one /GROUP_SIZE could be completely corrupted on tape,
yet BACKUP could correctly restore it.
John
--
Do you still have this (I assume it's different from the various C
versions of "VMSBACKUP"
floating around)
That program does not do a very good job of recovering from archive
errors.
There appears to be very little written down about the variations in
the VMS Backup
format as well.
On May 20 2005, 18:58, Geoffrey Thomas wrote:
> http://www.homepower.com/files/desulfator.pdf
I've built a couple of these, and they do work -- but bear in mind that
while they work for sulphated batteries, they won't work for batteries
with warped or disintegrating plates, which are other common problems
with batteries that have been abused.
> Above shows battery revitaliser cct.
> Elektor had a more complex cct. in the September 2001 issue.
> Don't know how successful it would be with sealed gel batteries.
> CPC / Farnell have similar prices to ARD with CPC offering free
carriage
> with orders over ?30 (ex. vat )
> I think Farnell have free carriage over ?10.
> Again no connection with either company, just use them a lot.
> > > I have *two* 1kW Smart-UPS units with dead batteries. (And two
more
> which
> > > I am using but the batteries are 'weak'.)
> > >
> > > Is there any way of rejuvenating sealed lead-acid batteries or is
it a
> case
> > > of once they fail to hold a charge, they are useless? (And if
so, does
> > > anybody know a very cheap UK supplier of them?)
--
Pete Peter Turnbull
Network Manager
University of York
... able to pick up a Sun CPU board for us and get it any further south
at any point?
I've found someone in Edinburgh who has a replacement Sun 4/330 CPU
board for us, but I don't exactly trust it going through the postal
system :-(
Getting it as far as Newcastle (*waves to Witchy*) or Leeds area by car,
or further south to Bletchley itself / Cambridge / Luton / London would
be rather useful!
Actually, it sounds like there's an entire 4/330 system; we only need
the CPU board - but if this donor one has a framebuffer then I could
cobble together a seperate working 4/330 out of the bits and our broken
4/330 CPU board... albeit it one with knackered serial ports :) No real
loss if we just get the CPU board and not the rest though...
cheers
Jules
Hi,
I'm looking for some info regarding this card : capacity, bus, etc. As far
as I remember it's a 4 SBI VAX 780 memory board ?
Thanks
ps; I'm looking for a "cheap" way to bring books and electronic parts from
Houston to Paris, France. Any hint welcome.
--
Stephane
Paris, France.
> Subject: Eeeeeeewww.......
>
> For the Apple 2 fans...or the MVS fan...or those that hate
> either one...
>
> http://www.livejournal.com/users/jmaynard/203754.html
>
> William Donzelli
> aw288 at osfn.org
Well, I find something beautiful about this.
