PARCTAB System
Technical Information
Mobile unit
Dimensions
- Height: 7.8 cm
- Width: 10.5 cm
- Depth: 2.4 cm
Weight
Battery
- 12 hours continuous, or
- 2 weeks at 10 mins/hour x 8 hours/day x 5 days/week
Screen
- Size: 6.2cm x 4.5cm
- Pixels: 128 x 64 (1 bit per pixel)
- Text: 21 chars x 8 lines
Audio
-
Piezo-electric tone generator
Touch screen
- Touch Technology passive stylus
- Resolution: 1:128 (X) and 1:64 (Y)
Button inputs
-
Three finger push switches
Infrared Communication
- Wavelength: 880nm (6 emitters and 2 detectors)
- Data rate: 19.2k baud PWM baseband modulation
- Protocol: CSMA
Processor and Memory
- 12 MHz Signetics 87C524/528
- Memory: version 1.0: 8k; version 2.0: 128k
External Ports
- I2C bus expansion
- Battery recharge port
Other
- Charcoal grey ABS case
- Xerox blue ABS buttons
Basestation transceiver
Infrared Communication
- Wavelength: 880nm
- Data rate: variable 9.6k, 19.2k, 38.4k pulse-position modulation
- Protocol: CSMA
Interface
- 38.4k baud serial connection up to 30m in length (2-pair telecom cable)
- Serial line daisy chain capability for 10 units (RJ11 4/6 jacks)
- External 20-pin peripheral connector
Input electrical requirements
- 12 volt direct, or
- Optional power through the serial cable
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