17 Feb
2003
17 Feb
'03
11:09 a.m.
OK!!!
The null modem that I just bought
must have been bad. I got another
one from a different vendor and I
can talk to my processor.
I am able to get into dialog mode,
setup mode, and into ODT.
I runs the self test loop correctly.
However, when I try to boot
either DU0 or MU0 the machine gets
hung up. My assumption is that the
disk may have been erased before
sale and the tape cartridge I got is
probably blank.
Where can I get a copy of XXDP on
a TK50 cartridge? Or is there another
way I can determine if my two peripherals
are working?
TIA,
DAve Chu
17 Feb
17 Feb
11:44 a.m.
--- chu(a)verizon.net wrote:
OK!!!
The null modem that I just bought
must have been bad. I got another
one from a different vendor and I
can talk to my processor.
Good start.
I am able to get into dialog mode,
setup mode, and into ODT.
Perfect.
I runs the self test loop correctly.
However, when I try to boot
either DU0 or MU0 the machine gets
hung up.
Do you have a complete grant chain? Gaps in the backplane
will also cause that behavior. You need all the cards "next"
to each other (according to the routing of your grant signals
which differs, depending on which backplane you have).
If you have a BA23, your grant goes something like this...
1 A-B
v
2 A-B
v
3 A-B -> C-D
v
4 A-B <- C-D
v
5 A-B -> C-D
v
6 A-B <- C-D
...etc., down to slot 9. Other backplanes are different (some all
sinusoidal, some straight down).
My assumption is that the disk may have been erased
before
sale and the tape cartridge I got is probably blank.
Possibly. If it just hangs when you boot to MU0, though,
without moving the tape, it may not be the media.
No way to tell about the disk at this stage.
Where can I get a copy of XXDP on
a TK50 cartridge? Or is there another
way I can determine if my two peripherals
are working?
Don't know. You _might_ be able to find XXDP on RX50 media
(or at least disk image files of the RX50 media), but it sounds
like you don't _have_ a floppy drive on your machine.
-ethan
2:44 p.m.
Ethan Dicks wrote:
--- chu(a)verizon.net wrote:
0 A-B
V
I runs the self test loop correctly.
However, when I try to boot
either DU0 or MU0 the machine gets
hung up.
Do you have a complete grant chain? Gaps in the backplane
will also cause that behavior. You need all the cards "next"
to each other (according to the routing of your grant signals
which differs, depending on which backplane you have).
If you have a BA23, your grant goes something like this...
1 A-B
v
2 A-B
v
3 A-B -> C-D
v
4 A-B <- C-D
v
5 A-B -> C-D
v
6 A-B <- C-D
...etc., down to slot 9. Other backplanes are different (some all
sinusoidal, some straight down).
I think there are *3* straight down slots before the first *serpentine*
slot in the BA23. :-)
-ethan
-chuck
4:07 p.m.
--- "Charles H. Dickman" <chd_1(a)nktelco.net> wrote:
There are. I know that, even if I didn't draw it well.
Thanks for catching that.
-ethan
Ethan Dicks wrote:
>Do you have a complete grant chain?
.
.
.
If you have a
BA23, your grant goes something like this...
I think there are *3* straight down slots before the first *serpentine*
slot in the BA23. :-) 
4:57 p.m.
On Monday, February 17, 2003, Charles H. Dickman wrote:
Ethan Dicks wrote:
0 A-B
V
> 1 A-B
> v
> 2 A-B
> v
> 3 A-B -> C-D
> v
> 4 A-B <- C-D
> v
> 5 A-B -> C-D
> v
> 6 A-B <- C-D
For a decent Qbus primer, see here:
http://telnet.hu/hamster/dr/qbus.html
It seems to be loading quite slowly ATM. Good luck.
--
Jeffrey Sharp
7:14 p.m.
Ethan Dicks wrote:
Do you have a complete grant chain? Gaps in the
backplane
will also cause that behavior. You need all the cards "next"
to each other (according to the routing of your grant signals
which differs, depending on which backplane you have).
I wonder if this is my problem? I have a 11/73 that I couldn't get to
boot, when I tried. It's partially disassmebled now, but hopefully when
I get more of my house done, I can work on it.
Chad Fernandez
Michigan, USA
7902
days inactive
7903
days old
5 comments
5 participants
participants (5)
-
chd_1＠nktelco.net -
chu＠verizon.net -
erd_6502＠yahoo.com -
fernande＠internet1.net -
jss＠subatomix.com