HP95LX Teardown and Repair Part 1

I bought a unit from eBay marked for parts. When turning on, the screen flashes and then turns off. Also it is making a funny noise while powered on. Seems someone tried to repair the speaker cables and soldered them opposite of what they should be. I asked the kind folks at http://reddit.com/r/retrobattlestations for advice. Stay tuned!

Images of the teardown  below- first step will be blowing all the dust out!

HP95LX Teardown

How to turn your phone into a laptop

You already carry a powerful computer in your pocket! But the lack of a physical keyboard makes it more of a media consumption rather than a productivity machine. The software is all there , though. Office, Drive, photo editing apps…even terminals and programming environments.

Most bluetooth keyboards are cramped and uncomfortable to use for long sessions. But, if you can find a clamshell keyboard case for tablets, you can adapt it for your phone. Use these instructions at your own risk!

I found an iPad Mini BT keyboard with a weighted bottom on clearance. With the velcro pads on the lid, I was already using it for a small tablet, when I realized I can also use it for my phone!

keyboard case for phone
Tablet Keyboard Case with Velcro Pads

I bought a cheap case for my phone and added Velcro on the back.

phone case
Phone Case with Velcro Strips

You see where this is going….I used the phone to take pictures so I don’t have a picture of the complete assembly.

phone keyboard case final
“Laptop” ready for your phone!

Note the phone’s ports are accessible so it can be charged.

 

My favorite old pocket computer … drum roll!

…is the TI-66 Programmable Calculator.

TI-66 pocket computer and manual
TI-66 Calculator and Manual

It is small and light and Turing complete. The programming records key presses as well as allowing for entering instructions in an assembly-like language, so it is a great primer for learning full Assembly language programming, which is what I am doing now on my HP95LX.

My HP95LX

I found this on eBay cheaper than they usually go for. I still need to make a data transfer cable for it, they are really expensive. Once I have the cable I can transfer drivers to the handheld so I can use Compact Flash cards for data transfer.

HP95LX
HP95LX and DOS Assembly Manual

As you can see from the picture, I am using to learn Assembly Language Programming under DOS. For now I am using the debug program to write small programs in Assembly, since I can’t put other software on the machine yet.