Note: You must run your own risk when try to do this cable. I am not responsible for any damge or hazard in your calculator that can happend due of bad use of these tools, inexperience of the user or other errors.

How to find Stuff Make a Power Supply

1 - Tools you will need

Pliers, probe, screw-driver	30 Watts welding	Simple Multitester
2 - Stuff you will need:
Connection screws, DB9 material covering and screws		weld about 30 cm or 1 foot
DB9 Conector, type female, of 9 holes (DB9 female) 2 pieces	Shielded wire Better if it was 3 ways and was shielded. 1 meter ( 3 feet )	About 50 g ( 5 oz) of Epoxy

3 - The Diagram

Diagram

to PC

BLACK: GROUND RED : TX BLUE : RX PINK : SHIELD

4 - Close up of DB9 pins

Front view	Back View
Getting pins to connection to HP Use pliers and burst up DB9	Big close up of connection pin. Extremity must be closest, not as in picture

5 - Procedure:

1 - Weld pines as indicated in the diagram.

2 - Be sure pins are correct in line, in their position.
It will not work if you swap positions.

3 - Be sure extremity of pins (see picture of big close up of pin) are with the points closest
It will have a bad contact if they are opened, as in the picture.
Contacts must be cleaned to avoid bad contact.

4 - Use epoxy to make and model the plug that will be pluged in H48.

5 - Check with multitester if all contact are working.

6 - Cable for Connection HP - HP

The cable to connect two HPs is relatively simple.
It is basicaly two parts that connect to the side of the calculator
connected one another as shown in the picture.

BLACK: GROUND RED : TX BLUE : RX PINK : SHIELD

7 - Final notes

From now on it depends on your creativity.
Be patient and persistent. Even Thomas Alva Edison tryed about 600 times before
the first eletric lamp work!

Remember also that you must run your own risk when test the cable in your calculator.

Good Luck!