Service manual

DOWNLOAD CHARACTER COMMANDS

Define download characters

Defines one or more new characters (up to 127 characters) and stores

them in RAM for later use. EDS switches A-1 and A-2 must be set

OFF; otherwise RAM is used as an input buffer, not downloading

characters and this command is ignored.

n1 is the character code of the first character defined and n2 is the

character code of the last character defined. n1 must be equal to or

less than n2.

The data for each character start with three bytes specifying propor-

tional spacing attributes: the first byte, m0, specifies the left of the

character; the second byte, m1, specifies the character width; the third

byte, m2, specifies the right of the character.

These values must not exceed the following maximum limits:

Character mode m1 m0 + m1 + m2

Draft 9 12

LQ pica 31 36

LQ elite 27 30

LQ semi-condensed 19 24

LQ proportional 37 42

Draft super/subscript 7 12

LQ super/subscript 19 36

LQ prop. super/subscript 37 42

Next comes the dot data. Normal character height is 24 dots, so there

must be 3 x m1 bytes of dot data. If the printer is in super/subscript

mode, however, the character height is 16 dots, so there must be 2 x

m1 bytes of dot data.

Each data byte indicates eight vertical dots, with the most significant

bit being the top dot, and the least significant bit being the bottom dot.

ASCII Decimal Hexadecimal

<ESC> “&” <0> n1

27 38 0

1B 26 00

n2 m0 m1 m2

m0 m1 m2

d1 d2 ... dx d1 d2 ... dx d1 d2 ... dx