IBM 5100 Restoration in progress
santo.nucifora at gmail.com
Wed Mar 18 07:05:30 CDT 2015
Sorry about that. Here's the registers:
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
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
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.
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:
>> Where did you find the code for the Bring Up tests? I would love to have
>> 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:
> 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
> 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
>> do see anything else in the registers, I'd be very happy to hear your
> 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.
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