IBM 4400 manual Bit Image Mode, Double Density Double Speed

Bit Image Mode, Double Density Double Speed

Bit Image Mode, Double Density Double Speed

ASCII Code ESC Y n1 n2

Hex Code	1B 59 n1 n2
Dec Code	27 89 n1 n2
Purpose	Selects Double Density, Double Speed 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.”

Example The following example produces Double Density Double Speed Bit Image graphics of the pattern used in the Single Density Bit Image Mode example. Note that the amount of data must be doubled for double density (the data is used 54 times rather than 27).

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