DATAMATH CALCULATOR MUSEUM
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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 |
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.
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.
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!
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 29, 2002. No reprints without written permission.