On Feb 7 2005, 20:26, Vintage Computer Festival wrote:
>
> Ok, so I decided to go back to the generic LSI 11/23 system I first
> started with a few weeks ago.
> I'm now getting a prompt! Yah!
>
> Not only that, I'm getting the disk controller bootstrap ($) prompt!
Yah!
> Yah!
>
> But now are new woes: when I type in "DY" to boot off the DY drive
the
> system pauses for a split second and then dumps into ODT with 165426.
> Looking at that address shows that there's no code there.
No code, as in ODT gives an error (prints a "?" and a carriage return)
or it's zeros?
> If I issue 173000G or 773000G, I get back to the $ prompt. Ok.
>
> However, one thing I noticed is that now, location 0 now has code!
Yah!
> Or at least, something is there. If I clear the first dozen or so
words
> and then reboot, the zeroes are overwritten. The weird thing is that
I
> don't see the drive light going on or the head relay engaging.
Apart from the lack of drive activity (LED flash and the clunk from
head relay) it sounds like you haven't got a bootable disk. Or that
you have, but it's for a different controller (a DX-bootable disk will
not boot on a DY, nor vice-versa).
> I've tried the system with both the DSD and RXV21 controllers with
two
> different sets of drives and I basically get the same results.
> No matter whether I boot with DY or DY0 or DY1, it always breaks into
ODT
> at 165426.
Depends on what's at location zero. You could try entering a copy of
the normal RX02 bootstrap code at location 1000 and stepping through it
to see what happens and where it goes wrong. Did you know that you can
type "P" instead of "G" to make the processor restart at the last-used
address, without resetting the bus and devices on it, and that you can
do this with the HALT switch on, so it single-steps? So if enter a
manual bootstrap at 1000, set the HALT switch, type "1000G" and then
keep typing "P" you'll single-step through the code starting at 1000.
--
Pete Peter Turnbull
Network Manager
University of York
Received on Tue Feb 08 2005 - 03:02:07 GMT