Unisys EFP9800 manual Download a Character

NCR 5021 Printer Emulation Commands

The values for the dot patterns are:

. .	. .	0
. .	. 0	.	0
. .	0 .	.	.	0
. 0	. .	.	.	.	0 . . . .
0 .	0 .	0	. 0		. 0 . . .
0 .	. .	.	.	.	.	0 . . .
0 .	. .	.	.	.	.	0 . . .

0F7FH

0EBFH

0DDFH

0BEFH

0557H

07F7H

07F7H

Finally, assign a hex value to the new character. For demonstration purposes, the hex value 41H will be assigned to the character “A.”

The codes are then downloaded into the printer.

Download a Character

Once a character has been defined, the associated codes can be downloaded into the printer. Use the Write Device Control Memory command.

First, calculate the offset (in words) within the character RAM where the set of seven 16-bit values derived from creating the character are to be placed. Since the demonstration character has been assigned the value 41H (65 decimal), and the character at offset zero within the character RAM is the ASCII space (20H), and there are 7 words (dot rows) per character, the offset is:

(41H - 20H) *7 = 00E7H

Next, format a Write Device Control Memory command. The fourth byte in the message is a VLI. The fifth and sixth bytes are the calculated offset. The remaining 14 bytes are the codes derived when creating the character.

1BH,5BH,7EH,10H,00H,E7H,0FH,7FH,0EH,BFH,0DH,DFH,0BH,EFH,05H,57H,07

H,F7H,07H,F7H

Finally, send the command to the printer. The printer must be offline before it can accept the command.

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