Compuprint MDP40B Programmer Manual Manuel d'utilisateur télécharger pdf (Page 76)

A-74

ESC =

Defines downloaded characters.

(IBM Proprinter XL24/XL24E, 2391+)

ASCII Code ESC =

m id p t

Hexadecimal Value 1B 3D

m id p t

Decimal Value 27 61

m id p t

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:

• Copy the character generator in ROM into RAM

• 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

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

: indicates that the character is an alphanumerical character

- Bit 6

: indicates a DLL character

: 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.

1 2 ... 71 72 73 74 75 76 77 78 79 80 81 ... 288 289

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Compuprint MDP40B Programmer Manual Manuel d'utilisateur Page 76