Vector Graphic Extended Systems Monitor Bedienungsanleitung PDF herunterladen (Seite 20)

Extended Systems

Monitor

User·

s

Manual

OTHER

USEFUL

MJNlTOR ROt1rINES

The

Monitor

contains

a number

of

routines

that

can

be

called

by

user

programs, and which

will

save

considerable

programming

effort.

In

addition

to

the

keyboard

input

and

video

output

described

elsewhere,

we

have:

AHEX

inputs

four hex

digits

from

the

keyboard and

returns

the

binary

value

in

D,E

registers.

A

space

is

automatically

output

at

the

end.

All

registers,

except

B,

are

used.

Entry

at

AREO

with

a

value

of

1-3

in

C

will

convert

that

many

digits.

Non

hex

values

will

be

ignored.

CRLF

will

output

a

carriage

return

?nd

line

feed

to

the

screen.

The A

register

is

used.

SPCE

will

output

a

space

to

the

screen.

The

A

register

is

used.

RNDM

returns

a

new

random number

in

B,C

based on

the

seed

in

B,C

as

it

is

called.

B,C

Dfould

not

contain

0000.

The pseudorandom number

sequence

generated

is

2

-1

entries

long and

is

based on a

software

simulation

of

a

shift

register

with

maximum

length

feedback.

PSW

is

used.

PTAD

first

outputs

a

CRLF,

then

outputs

the

binary

value

in

H,L

as

four

hex

digits

followed by a

space.

PSW

used.

PT2

outputs

(A)

as

two

hex

digits.

TAHEX

calls

AHEX

twice,

inputting

two

address

fields

of

four

hex

digits.

The

first

value

is

returned

in

H,L;

the

second

in

D,E.

14

Rev.

4.0-A

10/15/79

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