Texas Instruments IS-8400 Digital Planner

Date of introduction:  1993 Display technology:  LCD dot matrix
New price:   Display size:  6 lines by 24 char
Size:  6.5" x 3.4" x 0.2"
 164 x 87 x 5 mm3
Weight:  4.2 ounces, 120 grams Serial No:  0307233
Batteries:  2*CR2016 Date of manufacture:  wk 05 year 1994
AC-Adapter:   Origin of manufacture:  Italy
Precision:  10 Integrated circuits:  CPU: Toshiba T6M58
 ROM: AMI 1111657
 RAM: 2*SONY CXK58257
 Display: 2*Suwa SED1520
Memories:  64kB RAM    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (DE: 6.6 MByte)

IS-8400_P1.jpg (638605 Byte)The IS-8400 Digital Planner series of Organizers were introduced already in 1993 and ahead the competition. With the slim housing measuring only 0.2 inch they fitted perfectly in a Time System including a calendar, Today pages and tabs for notes, meetings and finances. 

The IS-8400 organizer keeps three main types of information: 

Reminders with unlimited alarms
Addresses with a capacity of roughly 3000 entries in three
    personalized lists
Notes sharing the same 64k Byte memory like the addresses

In addition to the basic Organizer function you'll discover:

A flexible clock with 12-hour AM/PM or 24-hour time
Up to 4 daily alarms
A calendar from January, 1960 to December, 2059.
A calculator with 10-digits display capacity
World time of 23 cities in all 24 time zones 
A backup battery

The display of the IS-8400 is very useful supporting 6 lines by 24 characters. The language of the menues could be choosen between five languages: French, English, German, Italian and Spanish.

The IS-8200 Digital Planner uses 32k Byte memory instead the 64k Bytes. In the United States a very similar product was sold as PS-9500.

PS-9000_2.jpg (397535 Byte)IS-8150.jpg (20809 Byte)The system could be personalized with some options:

bullet IS-8050 / PS-9000 Back-Up Memory Module bullet IS-8150 / PS-9020 Link Software for IBM AT-compatible PC bullet IS-8250 Leather Pouch

IS-8400_PCB.jpg (246947 Byte)
IS-8400_IC.jpg (171008 Byte)
Most astonishing with the IS-8400 Digital Planner is the thin housing measuring only 0.2 inch. The technology behind the membrane keyboard is similar to the PS-2100 introduced one year earlier. The electronics of the IS-8400 uses a clever arrangement of standard components found already in the PS-6600 and continued with the PS-6700.

horizontal rule

If you have additions to the above article please email:

Joerg Woerner, February 10, 2002. No reprints without written permission.