Star Micronics Delta user manual Proportkmal Characters, Download Character dejfinition commands

88 Delta User’s Manual -

		Table	7-l			-
Download	character dejfinition commands
Function		Control	code			-
Define download character		(ESC)	‘I*”	CHR$(l) nl	n2 ml.. . ml1
Copy ROM to download	RAM	(ESC) ‘I*”		CHR$(O)		-

Proportkmal

Characters

-

Up

until now,

all the

characters

that

your Delta

has

printed

-

have been

of a fixed

width-either

10,

12, or 17 (or 5, 6 or 8.5 in

enlarged

mode)

characters

per

inch.

Whichever

pitch

you select,

--

-

all the characters are the same width. You’ll notice though, that in

typeset

books,

such

as this one,

each

character

has a

slightly

_

different width. For instance, the “i” is quite narrow, and the “W”

is very wide. This is more pleasing to the eye and easier to read.

So, if you’re going to go to the trouble of designing your own

download characters for Delta, you might as well make them

pleasing

to the

eye! Proportional

download

characters

allow

you

-

to do just that. As you’ll remember from our initial discussion of

download

character

definition,

part

of the

attribute byte is for pro-

-.

portional width data. We skipped over that, with the promise of

describing

it later. Well now is the

time!

-

Defining

proportional

characters

-

Except for the actual width, defining characters for propor-

tional printing

is

exactly

the

same

as

defining

normal

width

_

download characters. Characters can range from 4 to 11 dots

wide. This means that characters can be as narrow as one-third

the normal

width. The examples

in Figure

7-14 show characters

of

-

-

different widths. These characters are defined in the program that

follows. -

10 DATA 77,11,1,126,1,2,4,8,4,2,1,126,1

20DATA 105,4,64,61,64,0,0,0,0,0,0,0,0

30DATA 112,23,127,0,17,0,17,14,0,0,0,0,0

40DATA 115,6,8,84,0,84,32,0,0,0,0,0,0

50DATA -1

60READ CHR

70IF CHR ( 0 THEN 150

80READ CODE

90LPRINT CHR$(27) Ir*"CHR$(l) CHR$(CHR)CHR$(CODE);