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RS-232C CIRCUIT BOARD

9.1 RS-232C Technical Description

The RS-232C option board for the Model 4 computer

supports asynchronous serial transmissions and

conforms to the EIA RS-232C standards at the input -

output interface (P1). The heart of the board is the

TR1602 Asynchronous Receiver/Transmitter. It

performs the job of converting the parallel byte date

from the CPU to a serial data stream including start,

stop, and parity bits. For a more detailed description

of how this LSI circuit performs these functions, refer

to the TR1602 data sheets and application notes.

The transmit and receive clock rates that the TR1602

needs are supplied by the Baud rate generator

(BR19411). This circuit takes the 5.0688 MHz

supplied by the CPU board and the programmed

information received from the CPU over the data bus

and divides the basic clock rate to provide two clocks.

The rates available from the BRG go from 50 Baud to

19200 Baud. See the BRG table for the complete list.

BRG PROGRAMMING TABLE

NIBBLE LOADED

TRANSMIT OR RECEIVE

BAUD RATE 16X CLOCK FREQUENCY

SUPPORTED BY

SETCOM

0H 50 0.8kHz yes

1H 75 1.2 kHz yes

2H 110 1.76kHz yes

3H 134.5 2.1523kHz yes

4H 150 2.4kHz yes

5H 300 4.8kHz yes

6H 600 9.6 kHz yes

7H 1200 19.2 kHz yes

8H 1800 28.8kHz yes

9H 2000 32.081 kHz yes

AH 2400 38.4 kHz yes

BH 3600 57.6kHz yes

CH 4800 76.8 kHz yes

DH 7200 115.2kHz yes

EH 9600 153.6kHz yes

FH 19,200 307.2kHz yes

Brand	Radio Shack
Model	TRS-80 Model 4
Category	Desktop
Language	English

Radio Shack TRS-80 Model 4 Technical Reference Manual

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