IBM 4400 manual Double Density Plot, Plot Data Line Format

Plot Data Line Format

3.Send a line terminator, either a Line Feed (LF, hex 0A) or a Form Feed (FF, hex 0C). A Carriage Return (CR) may also be used instead of the LF code, provided the Carriage Return has been configured for Carriage Return = Carriage Return + Line Feed (CR = CR + LF).

a.A line feed (hex 0A) used as the line terminator plots the contents of the buffer and advances the paper position a single dot row, based on the vertical density of the current mode.

b.A form feed (hex 0C) used as the line terminator plots the contents of the buffer and advances the paper to the next TOF.

4.Regardless of which line terminator code is sent, the emulation defaults to the previously selected print mode unless further plot control codes are provided with the data.

Double Density Plot

For double density plot, the plot line contains: Control Code hex 04, plot data bytes, a Line Terminator (hex 0A or hex 0C), Control Code hex 05, plot data bytes, and a Line Terminator. The control sequence for sending P-Series Double Density Plot is:

1.Send the even dot plot control code EOT (hex 04), followed by plot data bytes.

2.Send a line terminator, which causes the emulation to plot the data bytes; the paper position is not advanced in Double Density Plot; the emulation now waits for the second plot command and plot data bytes.

3.Send the odd dot plot control code ENQ (05 hex) and a second line of data, followed by a line terminator.

a.A line feed (0A hex) used as the line terminator plots the contents of the buffer and advances the paper position a single dot row, based on the vertical density of the current mode. A CR (if CR = CR + LF is configured) may also be used with the same result.

b.A form feed (0C hex) used as the line terminator plots the data bytes and advances the paper position to the next TOF.

4.Regardless of which line terminator code is sent, the emulation defaults to the previously selected print mode unless further plot control codes are provided with the data.

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