Unisys EFP9800 manual Data Bit Print Wire Top Bottom

Ithaca Peripherals Proprinter Emulation Commands

The printhead has 9 print wires, numbered from 1 to 9 with 1 being the topmost print wire and 9 being the bottom most. Each data byte directs the activation of the topmost 8 wires. Each data byte contains 8 data bits, numbered 0 to 7. Each bit directs the activation of a single print wire, as shown in the following table:

Data Bit	Print Wire
7	1	Top
6	2
5	3
:	:
0	8	Bottom

If a data bit contains a 1, the corresponding print wire is activated when the data byte is printed. If a data bit contains a 0, the corresponding print wire is not activated when the data byte is printed. The same print wire must not be activated by successive data bytes, unless the printing is single density. The inserted byte of 0 between data bytes, in the single density case, ensures that the same wire is not activated by successive bytes. When programming double density graphics, you must ensure that successive data bytes do not activate the same print wire.

Density, or horizontal resolution, is measured in dots/inch. All modes have a vertical resolution of 72 dots/inch.

The second component of the graphics statement, number of columns, is defined by two values, n1 and n2. To find the value of these numbers, divide the number of columns you want to print by 256.

n1 = Remainder after dividing n by 256.

n2 = Integer after dividing n by 256.

For example to print 400 columns of graphics:

400/256 = 1 remainder 144

n1 = 144, n2 = 1

3255 4073–002 7–17