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Texas Instruments PS-6700

Date of introduction:  Jan.5, 1996 Display technology:  LCD dot matrix
New price:  $69.00 Display size:  6 lines by 24 char
Size:  3.3" x 5.1" x 0.70"
 85 x 129 x 18 mm3
   
Weight:  4.6 ounces, 130 grams Serial No:  0000047
Batteries:  2*CR2032 Date of manufacture:  mth 07 year 1995
AC-Adapter:   Origin of manufacture:  Taiwan (C)
Precision:  12 Integrated circuits:  CPU: Toshiba T6M76
 ROM: AT27C512
 RAM: 2*UMC UM62256
 Display: 2*LCD-Driver
Memories:  64kB RAM    
Program steps:   Courtesy of:  Joerg Woerner

Texas Instruments introduced early in 1996 a new series of Personal Organizers. It could be traced back to the PS-6200, the first Organizer with the Texas Instruments label.

This PS-6700 looks identical to the PS-6800 with more storage capacity. Like most other PS-6xxx products these two products are compatible with the PS-6155 Dock-station cradle. The PS-6155 connects the Organizer with a IBM-compatible PC and synchronises the Organizer with Lotus Organizer 97 software. 

The PS-6700 organizer keeps three main types of information: Reminders, Addresses and Notes. Within these three areas, there are many different ways to store and recall information. The huge memory of the PS-6700 with 64k Bytes size is flexible and could be divided without any limitations among the three files. In addition to the basic Organizer function you'll discover:

A flexible clock with 12-hour AM/PM or 24-hour time
A calendar from January 1960 to December 2059.
A calculator with 10-digits display capacity and 12-digits of accuracy
World time of 62 cities in all 24 time zones supporting one home city and 4 world cities
A backup battery

PS-6700_1.jpg (20479 Byte)The display of the PS-6700 is very useful supporting 6 lines by 24 characters with crystal clear letters. 

Dismantling this PS-6700i manufactured in 1995 by Compal Electronics in Taiwan reveals no surprises. The printed circuit board (PCB) looks very familiar to us and we identify the major components immediately.

The hardware of the PS-6700 is similar to a lot of other products: An 8-bit microprocessor of the Z80 family, a huge ROM of 64k Byte capacity, a RAM of 64k Byte size and a driver for the LCD display. You'll find similar architectures with just another balance of RAM and ROM capacity:

Product ROM-size RAM-size Example
Spell-Checker 128k Byte 2k Byte RR-1
Data Bank 64k Byte 64k Byte PS-6700
Graphing calculator 64k Byte 8k Byte TI-81
Modern graphing calc 512k Byte 32k Byte TI-83 Plus

The pictured PS-6700 with serial number 0000047 uses an alterable EPROM for the main software instead the later Read-Only-Memory!

The data memory of the PS-6700 and PS-6800 are specified with 64k Bytes resp. 128k Bytes - the layout of the printed circuit board (PCB) suggests immediately the technical solution: The PCB accommodates one or two different sized memory chips in a very flexible configuration, this PS-6700 hosts two UMC UM62256 chips sporting a capacity of 32k Bytes, each.

The PS-6700 uses two driver chips in Chip-on-Board (COB) technolgy on the Main-PCB, we couldn't identify the manufacturer and type of them.

The PS-6700 was replaced soon with the PS-6760Si and within another year with the PocketMate 200. Models with more memory were available with the PS-6860Si / PocketMate 300 (128k Byte RAM) and PS-6960Si / PocketMate 400 (256k Byte RAM).

 

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If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, January 17, 2002. No reprints without written permission.