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GSXSYSTEM

2. ASSIGN.SYS

As described above,

this

file

contains

the

number

and

name

of

the

logical

Device

Driver

that

the

Apricot

uses.

When

TYPEd

it

should

display

the

following:

A)TYPE

ASSIGN.SYS

01

ddacrt.sys

A)_

The

01

indicates

that

the

driver is a

CRT

device driver,

and

is

the

primary

one

that

is

used

for

output.

The

name

of

the

file

that

contains

the

Device

Driver

is

next.

3. DDACRT.SYS

This

file

is

the

ACT

Graphics

Input

Output

System.

It

is

what

enables

GDOS

to

draw

lines,

plot

points

and

fill areas.

The

Device

Driver

was

written

in

8086

Assembler

and

Pascal.

THE

ACT

GRAPHICS SYSTEM - DDACRT.SYS

On

the

Apricot,

the

following

functions

are provided

that

are classed as

"Machine

Dependent"

in

the

Graphics

Systems

Extension

Programmer's

guide:

C>

Line

Attributes:

a.

7 Line Styles, 1

to

7

b. 5 Line Widths,

1,

3,

5,

7,

and

9 (In Pixels)

C>

Marker

Attributes:

a. 5 Markers, 1

to

5

b. 16

Sizes,

1,3,

5

..

31 (In Pixels)

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Service Manual305 pages