Dell External XL 9010 Specifications download pdf (Page 6)

(15) Set lower right hand corner

window - to use tllis command,

position the cursor. and

the

command.

Using

this command in

conjunction with

the

Define

Home

command

allo\'15

the

programmer to

easily define a window anywhere

the 540 display. The 2 command

codes when used together define a

box (window) giving starting and

ending address and the line length.

Remember

that

all cursor movement

is relative to the present "home"

position.

(16) Define Window - The video

system

allo'n'S

you to save up to 6

windo'n'S for instant recall.

use this

from

BASIC,

you;

CHR$(

16);CHR$(x);

where

"x"

is a number between 0 and

This saves all current window

parameters (starting line, ending line,

color, and line length) in a table for

later recall. Window 0 is already

defined to be the entire 540 video

display and window 5 is used

internally by the

set

Window to color

command.

You

may use window 0 for

your own use,

but

you should know

that

once

that

window's parameters

are changed you have no way to

access parts

the video screen

outside

this "master window"

(command code I).

you

are

not

using color or the

set

color controls,

then you may also use window

you

are

using color, don't use window

5·

( 17) Set Window - This is the

command

that

allo'n'S

you to recall

sa~ed

window parameters.

recall a

window from

BASIC,

you;

CHR$(

17);CHR$(x);

where

"x"

is a number between 0 and

This

Will

set

the Window to the

saved parameters and home the

cursor in

that

window.

(~'8)

Video Control - This command

code is used to control

the

video

board's color and sound.

use this

command from

BASIC,

you;

CHR$(

18);CHR$(x);

where

"x"

the

desired function

Poge

PEEK(65J

Summer 1966

number. Refer to the manual

that

came with your system for

the

desired function number. This

command also stores the last

command function entered

$259E

(decimal 9630) so

that

the present

video/sound/color attributes can be

read.

For

proper operation

the 540

Video Routine, you should no longer

POKE

the color/sound/video control

function,

but

use this command

instead.

(

19)

Output Character - This command

allo\'15

you to

any

the graphics

characters, including control

characters.

use this command from

8ASIC,

you;

CHR$(

19);CHR$(x);

where

"x"

is the

ASCII

value from 0 to

255

the character you wish to print.

(20) Direct Cursor Position - This

command is used to position

the

cursor anywhere within

the

present

window.

is used by;

CHR$(20);CHR$(x);CHR$(y);

where

"x"

the

desired column and

"y"

is the desired row. This routine

does range checking and will now

allow the cursor to move outside

the presently defined window.

All

movement is relative to the "home"

position.

I) Cursor

- This command moves

the cursor non -destructively up by

one line.

(22) - (23) Unused.

(24) Cursor Right - This command

moves the cursor non-destructively I

position to the right.

(25)-(28) Unused.

(29)

Home

- Homes the cursor in the

present window.

(30) Clear the

rest

line - clear from

present cursor position to the end

the line without affecting the cursor

position.

(31) Clear

rest

window - clears

from the present cursor position to

the

bottom

the Window without

affecting the cursor· position.

Installation

The first step is to make a

new

OS-65D

(version

3.2

or earlier)

diskette.

that

disk create three

files: a two-track file named

"8EXEC·",

a one-track file named

"VIDEO·",

and

a large file (10 tracks for

8",

for

mini's) named

"VIDASM".

Write down

the track number where the file

"VIDEO*"

resides"on your disk.

You'll

need

later.

Boot the Assembler/Editor and enter

the assembly language program given

in Listing

Change

the

origin address

on line #730 to reflect your system's

. memory size.

24K

systems,

should remain

$5800, on

32K

systems

set

to $7800, and on

48K

systems use $8800. Save this program

the

file named

"VIDASM".

Use

the

command in the assembler to

protect

the

high end

memory

(ie.

"H5A00", "H7A00",

"H8A00")

and

assemble the file to memory

With

the

command

"A3".

the assembly

proceeds without error, save the

machine code to disk

With

the

command;

!SA

tt, I =xB00/5

where

Ott"

the

track number where

"VIDEO·"

resides and

"xB00"

is the

origin address

the code

(ie.

"5800",

"7800", or "8800").

Now,

leave the Assembler/Editor and

invoke

8ASIC.

Enter the

8EXEC·

program given in Listing

Note

that

you'll have to also insert the track

number for

"VIDEO·"

in lines 10280

through 10300 as you did in the

above command. Finally, save

in the

file named

"8EXEC·"

(clever, eh?).

Run

this program and . the new video

driver will be installed and ready for

use. When you

want

to install the

video driver on other diskettes, just

transfer the files

"8EXEC·"

and

"VIDEO·".

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Dell External XL 9010 Specifications Page 6

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