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DISPLAY PORT CHAPTER 8

Page 28 RPC-30

DISPLAY TYPES

CAM BASIC assumes there is a controller on the display.

Its software driver is based upon the characteristics of

the display family. Compatible VF and LCD displays

are shown below:

Manufact. Model Type

Optrex DMC 40457 LCD 4 x 40

Optrex DMC 40202 LCD 2 x 40

IEEE 3601-90-080 DF 4 x 20

Optrex DMF 5003N LCD 160 x 128

DISPLAY CONNECTOR PINOUT - J4

The display port uses an 82C5 5 for data and control.

The table below lists a pin number and its intended

function. A display may not use all lines even though

they are available.

J4 8255 Function

Pin Port/line

1 Logic + 5V

2 Digital ground

3 A/4 D4

4 Contrast

5 A/6 D6

6 A/5 D5

7 B/4 Reset

8 B/3 Write

9 B/2 Read

10 A/7 D7

11 A/1 D1

12 A/0 D0

13 A/3 D3

14 A/2 D2

15 B/7 CS

16 B/6 Command/ data

17 B/5 Halt

18 Ext. contrast

19 Alternate power

20 Power ground

The contrast adjustm ent (J4-4) provides a var iable

voltage from + 5 to -7 VDC. External contrast (J4-18)

is an external voltage required for gr aphics displays.

J4 is available for additional I/O if a display

is not used. Port A may be configured as an input or

output. Port B must be configured as an output if a 17

key or larger keypad is used.

The address for port A is 80; port B is 81. Use

CON FIG PIO to configure the port.

COMMANDS

The following CAM BASIC commands are used for the

display.

Command Function

CONFIG DISPLAY Specifies the display type

to use. Use &50 for the

address.

DISPLAY Prints the string at the

row and collum specified.

The following commands are applicable to the LCD-

5003 graphics display.

DISPLAY LINE Draws a line.

DISPLAY P Prints a dot to the screen.

DISPLAY [ON][OFF] Turns on graphics and

character displays.

CLEAR DISPLAY Clears graphics and/or

character display.

See the DISPLAY command for mor e variations.

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