Unisys EFP9800 manual Graphics Commands, Format of the Data Stream for Graphics

Ithaca Peripherals Proprinter Emulation Commands

Set Double-Wide for Current Font

Doubles the width of the currently selected character size. Double-wide can begin in the middle of a line, but cannot be canceled before the end of a line by the Cancel Single Line Double-Wide command (14).

To return to single-wide characters, use the Cancel Double-Wide for Current Font command (1B 57 30).

Hexadecimal	Decimal	ASCII
1B 57 31	27 87 49	ESC W 1

Graphics Commands

These commands control graphics printing. The commands are listed in numerical order of their hexadecimal codes. You can create a graphic image using a graphics software program or by doing the encoding yourself.

Format of the Data Stream for Graphics

The graphics sequences recognized by the IPI Proprinter emulation have the following format:

1b GG n1 n2 d1 d2 d3 . . . d(n2*256)+n1

1b GG introduces the graphics sequence.

GG can be either 4B, 4C, 59, or 5A.

n1 and n2 are values between 0 and 255.

The total number of data bytes, di, which follow n1 and n2 is given by the formula, n1+(256*n2).

The data bytes, di, are in sequence based upon the order of their printing from left to right. d1 is the leftmost byte in the graphics image and d(n2*256)+n1 is the rightmost byte. Both single density printing and double density printing are available. In single density printing, after data byte di is printed, a byte of zero bits is printed, and then byte d(I+1) is printed. In double density printing, no zero byte is inserted by the printer.

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