Search   
Home  Print View  

 

Operator's Manual

Branch Content

Entering the start up program

Software (such as the Operating System) is stored on tape; however, in order to read from tape into memory, a "loader" program is needed. You enter that "loader" (or whatever initial software is required) by mean of the Entry Section of the Console.

First, set the starting address as following:

1.- Actuate the Entry Switches to reflect the desired initial address.
2.- Press the LOAD button.

You will see the address reflected in the A-DISP. A memory read cycle will be performed automatically over that address and its content will be displayed in the D-DISP (if "Memory" have been selected in the Data Selector).

Second, enter the memory content as following:

3.- Actuate the Entry Switches to reflect the data word desired for the first location.

4.- Press the DEPOSIT button. The Entry Switches content will be copied into memory. A memory read cycle over the next address will be performed so you will see the A-DISP incremented and the D-DISP displaying the content of that memory cell, must likely the random value it contained after power-on.

5.- You can keep entering data this way. You can also use the EXAM-, EXAM+ buttons to examine content from the previous or next memory cells respectively; A-DISP and D-DISP will get conveniently updated. You can even jump to a different address as in steps 1 and 2. Please notice that when you press the DEPOSIT button, the Entry Switches content is copied into the memory cell which address is the one shown by the A-DISP at that time; hence, if you navigate away from the current "insertion point", you must get back to that point before continuing with data entry.

6.- Bring the A-DISP to reflect the initial address again (as in step 1). Now you can run the program by pressing the START button, as explained in the next section.

Homebuilt CPUs WebRing

JavaScript by Qirien Dhaela

Join the ring?

David Brooks, the designer of the Simplex-III homebrew computer, has founded the Homebuilt CPUs Web Ring. To join, drop David a line, mentioning your page's URL. He will then add it to the list.
You will need to copy this code fragment into your page.

Project start date: May 13 of 2009