DATAMATH CALCULATOR MUSEUM
|
DATAMATH CALCULATOR MUSEUM |
Texas Instruments PS-6860Si
| Date of introduction: | 1996 | 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: | 4.6 ounces, 130 grams | Serial No: | |
| Batteries: | 2*CR2032 | Date of manufacture: | year 1996 |
| AC-Adapter: | Origin of manufacture: | Taiwan (C) | |
| Precision: | 12 | Integrated circuits: | CPU: Toshiba T6M88 ROM: Macronix MX27C512 RAM: Samsung KM681000 Display: 2*LCD-Driver |
| Memories: | 128kB RAM | ||
| Program steps: | Courtesy of: | Joerg Woerner |
The
PS-6860Si replaced the earlier PS-6800 within one year.
The changes are minor:
| • he
PS-6155 Dock-station
cradle to synchronize data with the Lotus Organizer 97 software was optimized. • The display of the organizer supporting 6 lines by 24 characters was enhanced with a greenish backlite feature called Indiglo. |
Dismantling
this PS-6860Si manufactured early in 1996 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 resembles more or less its predecessor PS-6800 but is centered
around a Toshiba T6M88 Application Specific CPU based on the 8-bit Z80 core
instead the previous T6M76.
The
pictured PS-6860Si uses a Macronix MX27C512
program memory, an OTP-ROM with a capacity of 64k
Bytes. Later products use a chip marked with AB23512.
The
data memory of the PS-6760Si, PS-6860Si
and PS-6960Si are 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 PS-6860Si hosts one
Samsung KM681000 chip sporting a capacity of 128k Bytes.
The
PS-6860Si uses two driver chips in
Chip-on-Board (COB) technology on the Main-PCB, we couldn't identify the
manufacturer and type of them.
It took another year
until the PocketMate 300 appeared with a better keyboard
layout.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, June 25, 2002. No reprints without written permission.