Radio Shack's TRS-80 Model 100 is a portable computer equipped with built-in software to perform a variety of useful tasks such as text preparation, schedule and address organizing, and telecommunications.

Additionally, Model 100 has the following standard features:

• Enhanced version of Microsoft BASIC
• Full-size typewriter style keyboard
• LCD with seven lines by 40 columns
• Built-in modem
• Built-in cassette interface
• Built-in bar code reader interface
• Parallel printer interface

Other features available are: real time clock and calendar, upper and lowercase characters, and RAM internally expandable to 32K bytes.

Specifications

Main Components

Keyboard

• 27
  Number keys 10
  Picture- control keys 7
  Function keys 8
  Special symbol keys 8
  Mode keys 5
  Other special- use keys 6
  

LCD display

Display panel
240 x 64 Full- Dot matrix
1/32 duty
1/6.66 bias

pot pitch
0.8 x 0.8 mm

Dot size
0.73 x 0.73 mm

Effective display area
191.2 x 50.4 mm

Operation batteries

Batteries
Four AA alkaline- manganese batteries

Operation time
5 days (at 4 hours/day)
\20 days (at I hour/day)
Note: I/O is disconnected.

Memory protection battery (on Main PCB)

Battery
Rechargeable

Protection time
About 40 days (8 KB)
About 10 days (32 KB)

Recharge method
Trickle charge by AC adaptor, or operation batteries

LSls

CPU
80C85
Code and pin compatible with 8085

ROM
Max. 64 KB (2 banks of 32 KB)
Standard 32 KB
Option 32 KB

RAM
Max. 32 KB
Standard 8 KB RAM pack
Incremental 8 KB RAM pack on PCB

Clock Calendar

aPD1990AC
No leap year/no February 29

I/O Interface

RS- 232C (conforms to EIA Standard)

Signal
TXR (Transmit Data)
RXR (Receive Data)
RTS (Request to Send)
CTS (Clear to Send)
DSR (Data Set Ready)
DTR (Data Terminal Ready)

Communications protocol

Word length
6, 7, or 8 bits

Parity
NON, EVEN, or ODD

Stop Bit length
1 or 2 bits

Baud rate
75, 110, 300, 600, 1200, 2400,4800, 9600, 19200 BPS

Max. transmission distance 5m
Driver max. voltage output +- 5V
Driver min. voltage output +- 3.5V
Receiver max. voltage input +- 18V
Receiver min. voltage input +- 3V

Modem-coupler (conforms to BEL103 standards)

Baud rate 300 BPS

Programmable items:

Data length 6, 7, or 8 bits

Parity NON, EVEN, or ODD

Stop bit I or 2 bits

Full duplex Answer/call switchable mode

Other functions Hang- up and auto- dialer

Audio cassette interface

Data rate 1500 BPS (MARK: 2400 Hz, SPACE: 1200 Hz)

Printer interface (conforms to Centronics interface standards)

Handshake signal STROBE, BUSY, BUSY

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