IBM 4400 Graphics, Double Density, Configuring the Epson FX-1050 Emulation with Control Codes

Chapter 6 Configuring the Epson FX-1050 Emulation with Control Codes

Graphics, Double Density

ASCII Code ESC L n1 n2

Hex Code	1B 4C n1 n2
Dec Code	27 76 n1 n2
Purpose	Selects double density bit image graphics of 120 dots per inch
	horizontally and 72 dots per inch vertically.
where:	(n1 + 256n2) defines 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.

“DATA” consist of 8-bit dot columns, with the MSB at the top, and “1” bits producing dots. For more information, refer to Chapter 8, “Graphics.”

Comment You can change graphics density with the ESC ? command.

Example The following example produces double density bit-image graphics of the pattern used in the standard density bit-image mode example. The amount of data must be doubled for double density (the data are used 54 times rather than 27).

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