DATAMATH  CALCULATOR  MUSEUM

Texas Instruments PocketMate 200

Date of introduction:  1997 Display technology:  LCD dot matrix
New price:   Display size:  6 lines by 24 char
Size:  3.3" x 5.1" x 0.70"
 85 x 129 x 18 mm3
   
Weight:  5.1 ounces, 144 grams Serial No:  
Batteries:  2*CR2032 Date of manufacture:  mth 10 year 1997
AC-Adapter:   Origin of manufacture:  Thailand (C)
Precision:  12 Integrated circuits:  CPU: Toshiba T6M88
 ROM: AB23512
 RAM: 2*UMC UM62256
Memories:  64kB RAM    
Program steps:   Courtesy of:  Joerg Woerner

PM-200_P1.jpg (569873 Byte)Nothing else like the PocketMate 300 with reduced storage capacity of 64k Bytes. The PocketMate 200 replaced the PS-6760Si.

Dismantling this PocketMate 200 manufactured in 1997 by Compal Electronics in Thailand reveals no surprises. The printed circuit board (PCB) looks very familiar to us and we identify the major components immediately.

The hardware resembles more or less its predecessor PS-6760Si and is still centered around a Toshiba T6M88 Application Specific CPU based on the 8-bit Z80 core. 

The program memory is labelled AB23512 0063, probably an OTP-ROM with a capacity of 64k Bytes. We know the AB23512 already from the PS-6860Si, while the original PS-6700 makes use of the ATMEL AT27C512 OTP-ROM.

The data memory of the PocketMate 200, 300 and 400 is specified with 64k Bytes, 128k Bytes resp. 256k 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 PocketMate 200 hosts two UMC UM62256 chips sporting a capacity of 32k Bytes, each.

PM-200_PCB2.jpg (488568 Byte)The most obvious design change from the PS-6760Si is the new configuration of the two display drivers. While the PS-6760Si uses two driver chips in Chip-on-Board (COB) technolgy on the Main-PCB, are they now located on an additional PCB hosting the numerical keyboard.
PM-200_LC.jpg (330611 Byte)

The PocketMate series was together with the Avigo 10 the last organizer in a long line started with the PS-6200 and the simpler Mini Data Bank.

About one year after the Organizer series was discontinued the TI-83 SE graphing calculator appeared with an integrated organizer function!

horizontal rule

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

Joerg Woerner, December 29, 2002. No reprints without written permission.