Epson FX-80 Specifications download pdf (Page 115)

Microscopic line spacing

There is also a way to space at smaller intervals than 72nds. Using a

CHR$(27)“3” will set the spacing to increments of 216th of an inch;

l/216-inch is one-third the distance between the pins of the print head

(center to center). That means the printer can position a specific line

one-third of a dot lower than the previous line. In fact, that’s exactly

how the Double-Strike Mode operates. One word of caution. As you

can imagine, total accuracy is not guaranteed for such fine settings as

l/216- and 2/216-inch.

You specify this finer line spacing in much the same way as you did

the variable line spacing that we showed above with CHR$(27) “A”.

The format is CHR$(27)“3”CHR$(n), where n can range from zero to

255. Here’s an example using the l/216-inch line spacing five times.

Change lines 10 and 30 to read:

10 LPRINT CHR$(27)"3"CHR$(l)

30 LPRINT "ABCDEF"

These letters are very heavy looking. To carry this idea to an extreme,

increase the upper limit of the loop to 10 or 15.

The ability to adjust line spacing in increments of l/216-inch gives

you tremendous control in your vertical formatting. You can use this

control to fine-tune your graphics printouts. If the 7-dot line spacing

leaves gaps in the figures, just tighten it up by changing it to 6-2/3-dot

(20/216-inch):

CHR$(27)"3"CHR$(20)

We’ll use this technique in a later chapter.

Line Feeds

Besides being able to change the size of line spaces, you can change

other aspects of a line feed. You can send it immediately and for one

line only, or you can send it as above, as a continuous feature. And if

you are using an FX-80, you can send a reverse line feed to make the

print head move back up the page.

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Epson FX-80 Specifications Page 115