Compuprint 4247-L03 Programmer Manua Manual de usuario descargar pdf (Pagina 54)

n Selection n Selection

2 Courier 1 Gothic

4 Script 5 OCR-B

6 OCR-A

182 DLL

Before copying ROM characters to RAM, cancel italics with the ESC 5 command. After copying you can

italicize characters by sending the ESC 4 command.

ESC =

Defines downloaded characters. (IBM)

ASCII Code ESC = nmidpt

Hexadecimal Value X'1B' X'3D' nmidpt

Decimal Value 27 61 nmidpt

This sequence allows you to design and then down-line load special characters not present in the

character set in use. Whenever you would like to start the DLL setting procedure, proceed as follows:

v Copy the character generator in ROM into RAM

v Select the DLL generator

There are 256 entries of 9 bytes that compose the look up table of a character generator. One entry

describes one character as follows:

Byte 1, 2 The absolute address of the character definition.

Byte 3 :

Bit 7

1: indicates that the character is a graphic character (connects at 6 lpi)

0: indicates that the character is an alphanumeric character

Bit 6

0: indicates a DLL character

1: indicates a resident character

Bit 5 to 0 These 6 bits indicate the effective number of dot columns of the character

shape stored in memory.

Byte 4: Graphic character description:

v 0: shading character

v 1: line drawing character

v 10: underscored character

v 11: not supported

All graphics characters are 30 dots high. An underscored character is

defined as a blank graphic (all zeros) and it is automatically generated by

the printer. A shading character repeats dots 1—6 of each column as dots

25 through 30 respectively. A line drawing character repeats dots 23 and

24 as the pairs 25 and 26, 27 and 28, 29 and 30.

Bit 5 to 0 The number of dot columns of the character shape minus one. For

example, the character width of Draft generator is 10 dots and bit 5 to 0

must be set to 9.

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Compuprint 4247-L03 Programmer Manua Manual de usuario Pagina 54