Connection possibilities of PC-1475


Index


Connection to a PC over the serial interface (9 lines!)

Attention! Construction only for experienced people! No warranty or guaranty for mistakes on this page!

Pocket Computer 15 pin IO-big PC 9 pin IO
2-2
3*-3*
7-5
11-1+8

plug for PC-1475

plug for PC

(*): voltage is parted! The voltage parter consists of two 1 kOhm resistors, which reduces the 12V from a PC to pocket-friendly 6V! If you use a laptop you shouldn't use the resistors or make a switch between GND and the connected resistor to cut it off.
Don't use it for mouse or modem connections, it won't work!

(PC out 3)--[diode->|-]--[1 kOhm]--(Pocket in 3)--[1 kOhm]--Ground

* here to solder!

Pocket line 5 must be connected to 10 or 13!



Advanced serial cable


C1 - C410F 25V
C5 + C60,1F
IC1CMOS 4069 (14 Pin)
IC2HIN232A oder MAX232 (16 Pin)
IC3Voltage regulator 5V L7805CV or similar
*The diode (N4841) prevents the pocket computer from discharging when no battery is connected
This cable works with mouses, modems, laptops and many more serial devices, too!


Connection to another Pocket Computer

over 2 lines:

PC 1 15 pin IO-PC 2 15 pin IO
2+3-2+3
7-7

Pocket line 5 must be connected to 10 or 13 at both Pocket Computers!
(The numbers of the lines of the interface are counted from the contrast wheel!)

over a full cable:

PC 1 15 pin IO-PC 2 15 pin IO
2-3
3-2
4-8
5-11
7-7
8-4
11-5


Connection to a serial modem (9 line connector!)

Pocket Computer 15 pin IO-modem
2-3
3*-2*
4-7
5*-6+8*
7-5
8*-1*
14-4

(*): voltage is parted!
Use the advanced cable for this!

Commands for a standard modem:
Initialization:

AT&F&C1&D2 + CR

Dialing:

ATDT + phone number + CR

End a call:

~~~+++~~~ATH0 + CR



Serial Driver for 4800 Baud

You'll need a serial cable, either simple or good. The driver uses the same pins like the internal with 1200 baud.
Download: SIO driver

Installation


Usage

Setup PocketAsm to 4800 baud and ignore line endcode:

How to send data to PC

In PocketAsm click receive file and enter a name.

The pocket will show the prompt ">" when finished. PocketAsm: Press ESC.

Transfer back to pocket computer

PocketAsm: Click send file and select file. Pocket: Will show prompt ">" when finished.

Edit program on big PC and send it back

Start PocketAsm




Copyright © Simon Lehmayr (Parts of my page were made with the help of Laurent Duveau)
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