IBM 4400 manual Bit Image Mode, Quadruple Density

Chapter 5 Configuring the Proprinter III XL Emulation with Control Codes

Bit Image Mode, Quadruple Density

ASCII Code ESC Z n1 n2

Hex Code	1B 5A n1 n2
Dec Code	27 90 n1 n2
Purpose	Selects Quadruple Density Bit Image graphics.
where:	(n1 + 256n2) define the number of data bytes to follow.
	DATA = ASCII characters for the dot pattern bytes.

NOTE: The DATA can be expressed in a format with the appropriate decimal values of the ASCII characters supplied especially in cases where the dot patterns of nonprintable characters are required.

Comment For detailed information, see the Bit Image section in Chapter 8, “Graphics.”

The printed density in this mode is 120 dpi horizontal and 72 dpi vertical if selected when the Letter Gothic (DP) print mode is active.

Example The following example produces quadruple density graphics of the pattern used in the Single Density Bit Image Mode example. Note that the amount of data must be quadrupled for quadruple density (the data is used 108 times rather than 27).

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