IBM 5100 Restoration in progress

Santo Nucifora santo.nucifora at
Thu Mar 19 15:21:36 CDT 2015

Hi Christian,

Sorry, I missed the "Single Step" mode line and thought you just wanted the

Screenshot is here:

After trying single step mode, I'm in an endless loop and not actually
halted, it seems.
Do let me know what you think.

On Thu, Mar 19, 2015 at 10:51 AM, Christian Corti <
cc at> wrote:

> On Thu, 19 Mar 2015, Santo Nucifora wrote:
>> It is my understanding that if an A gets printed, the A test completed
>> successfully and it is dying at the B test where the last part of the test
>> is to print the letter B on screen.
> No, first the letter is printed, then the test is started.
>  We certainly need a hex dump for the 5100 but I've looked around and found
>> nothing.  I don't suppose I can dump my Executable ROS in the condition my
>> machine is in.
> Shure you can, please just do what I told you. Make a screenshot with your
> camera of the first 512 bytes of the Executable ROS:
>> 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
> I don't have any further clue without that screenshot.
>  Is there a list of the Assembler opcodes I can reference?
> Ehm, you did have a look at our web site, don't you?
> dev_en/ibm_5110/technik/en/5110.html
> Navigate to "Programming in machine language --> Opcodes"
> Christian

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