Using a SHARP ZQ-6200 electronic organizer as a terminal

My employer decided that as I was so unorganised it would be a good idea to provide an electronic organizer to whip me into a frenzy of 'Dilbert' like efficiency. However it's seldom a good idea to give me any piece of hardware to improve my efficiency, because as every one knows "Hardware is for Hacking.
A quick browse through the manual revealed that the little beastie had a terminal emulator built in. Hmm.. could improve productivity. The reference manual showed an RS232 interface attached to the 'Computer Link' Port. A quick phone call revealed that this interface would cost me more than a dollar or two and so buying one was quickly ruled out.
Probing around with a CRO on the port revealed data on pin 2. That sounds familiar. A resistor from pins 2 to 3 gives me an echo in terminal mode. And of course ground is on pin 7.
My probings so far give me this pinout:

  1. Unknown (closest to front)
  2. TxD (From organiser)
  3. RxD (To organiser)
  4. Unknown
  5. Unknown
  6. Unknown
  7. Ground
  8. Unknown
  9. Unknown
  10. Unknown
  11. Unknown
  12. Unknown
  13. +4.5V (Not switched)
  14. Unknown
  15. Unknown
The polarity of the Tx & Rx signals are the same as on the RS232 lines except they only go from 0 to ~4V rather than -10 ish to +10 ish. It may be that the organiser will drive RS232 directly (Standard line receiver chips like 1488/1489 see 0V as negative ) but I don't really want to blow the guts out of my (or rather my employers) unit. Here is the interface circuit I am using:

The hardest part to get is the 0.05" pitch 14 pin connector for the "Computer link" port. I am using a 0.1" pitch gold header strip with an extra pin cunningly inserted to pick up pin 2.

Termcap

If you're going to do anything useful with your 'orgo-term' you'll need to attach it to a *NIX machine. To make the small size of the screen (a scrolling 40x8 window onto an 80x24 screen) less painfull here are a couple of termcap entries.
..... which I haven't copied across yet.....
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