Robot Brain: Build a single board computer in an evening

Step 7 Download xmodem

If you bought the battery backed ram chip you will only need to do this once. Indeed, others are working on putting this on the eprom chip so you may not need to do this at all in the very near future. At the > prompt, type h

Don't type anything else. Don' t type Enter. Just a single h, either lower or upper case. The cursor will go down one line but nothing else will happen. Now click at the top of the hyperterminal program on the menu Transfer. Click on Send Text File. In Filename, use browse to find the hex copy of xmodem that you downloaded. It is called XM50LB1.HEX You might need to change the default search for *.txt to *.hex to find it. Click on ok, and lots of numbers will go across the screen for about 30 seconds. Wait till they stop.

Then hit the letter c once, again with no enter. Wait 2 secs and you will be in CPM with a A> prompt.

Now type the following and hit enter:

Save 40 b:xm.com

Now type B: and enter, to change to drive B and you will get a B> prompt.

Now type DIR and enter, to list the files.

There are three drives on this computer, A, B and F. You can see what is on each by typing the drive letter, then a colon, then enter, and then DIR.

The picture shows a screen shot.