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Support Group Application Note No. 002, Issue 1 16th June 1992 Using the Acorn JP101 Spark Jet Printer Apart from being a remarkably quiet and fast home computer printer, the JP101 Spark Jet Printer has many special features which are simple to use and can improve the presentation of your printouts. Among these features are nine different national character sets, double width printing, double height printing, and horizontal and vertical tabulation functions.
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Support Group Application Note No. 002, Issue 1 16th June 1992 4) Double Height Characters Off VDU1, 27, 1, 37 This command turns off double height printing. 5) Underlining VDU1, 27, 1, 42, 1, 48 (normal underlining) VDU1, 27, 1, 42, 1, 49 (double underlining) VDU1, 27, 1, 42, 1, 50 (dotted underlining) These commands turn on the appropriate style of underlining, which remains in operation until cancelled.
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Support Group Application Note No. 002, Issue 1 16th June 1992 14) Programmed Vertical Tabulation VDU1, 27, 1, 81 (format information) VDU1, 27, 1, 90 This is the vertical version of 12) above. See 12) for more information. The following program demonstrates printing as programmed vertical tab stops.
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Support Group Application Note No. 002, Issue 1 16th June 1992 19) Carriage Return VDU1, 13 Performs a single line feed 20) Audible Alarm VDU1, 7 Activates audible alarm lasting about 300msec. 21) Clear Printer Buffer VDU1, 127 Clears print buffer and resets print head. Does not affect tab programs etc. 22) Plotter Programming Although it is possible to program graphics dump routines in BASIC the result would be very slow due to the large amount of information that must be processed.