18 Mar
2015
18 Mar
'15
12:05 p.m.
Sorry about that. Here's the registers:
http://vintagecomputer.ca/wp-content/uploads/2015/03/IBM-5100-Register-disp…
It was an inline image and I can still see it when I look a the email I
sent :) That's a direct link.
The display of registers is consistent from first start up and through
restarts.
I did want to thank you also for the terminator clarification. I changed
my page. I also looked at the IBMparts.txt reference chart. That's
exactly what I needed. I do have some rusty logic chips that cleaned up
decently but I don't trust them exactly since the previous owner turned
this computer on with the rust bridging pins. He claimed it worked with
the Register screen on. I knew otherwise. All of the "cans" looked good
though.
Thanks again. I do need to look at the Maintenance manual when I get home
to line up the registers and see if $FF is in the right one but you can
probably tell that pretty quickly with the picture.
Thanks for looking.
Santo
On Wed, Mar 18, 2015 at 7:54 AM, Christian Corti <
cc at informatik.uni-stuttgart.de> wrote:
On Wed, 18 Mar 2015, Santo Nucifora wrote:
I don't see anything... was that an attachement or inline picture?
You'll notice that the first two characters in second line is not right.
They are absulutely right! This means that the processor is running
(executing a halt instruction that in reality is a jump to itself). What
you are seeing is the program counter (register R0) changing. I you put the
machine into single-step mode (there's a switch in the machine under the
cover) you can step the instructions one-by-one.
Sadly, it's gotten a little worse after taking this picture so lines 5 and
> 6 have some garbling of the dots. Since I was seeing text, I didn't
> suspect
If all other characters are ok, what you describe as garbling are just
changing data bytes.
the display card right away (again, not knowing the machine) but it may be
> bad RAM on the display card.
I wouldn't suspect the display card, too.
I'll refer to your IBMparts.txt file and see what is on that card. If
> you
> do see anything else in the registers, I'd be very happy to hear your
> thoughts.
Could you put the picture on your web site or send me an email? And please
also make the following readable screenshot:
1. Put the machine into single-step mode
2. Press RESTART
3. Switch to DISPLAY REGISTERS
4. Make photo
This is the hex dump of the first 512 bytes of the Executable ROS. At
least that's how it works on the 5110.
Christian
Where did you find the code for the Bring Up
tests? I would love to have
a
look. The 5100 Maintenance manual is not very specific and certainly
doesn't have code in it (unless I missed it).
I disassembled it myself. You can find the disassembly on our FTP server,
too: ftp.informatik.uni-stuttgart.de/pub/cm/ibm/ibm5100/execros.asm
But as mentioned, all information refer to the 5110.
My registers looks like this: