IBM 4400 manual Start Load Code-Hex 1E or 6E, Channel Assignment

Start Load Code-Hex 1E or 6E

P-Series EVFU

The EVFU may be selected in the P-Series and P-Series XQ protocols. The EVFU provides 14 or 16 channels to identify up to 192 lines depending on the paper instruction. The programming sequence is:

1.Send the start load code

2.Send the line identification codes

3.Send the end load code

Start Load Code-Hex 1E or 6E

The start load code clears and initializes the EVFU memory for the memory load program. The start load code is hex 1E when the PI signal line is disabled (low) or hex 6E when the PI line is enabled (high).

Channel Assignment

The EVFU memory has the capacity for 192-line forms. The first line identification code (channel code) in the memory load program defines the first line on the form, the second line identification code defines the second line on the form, etc. Each line must have a line identification code. Filler channel codes are used for lines that are not accessed by the print program. Any channel code can be used as a filler except channel code 1, which is reserved for the top-of-form, and channel code 12, which is reserved as the vertical tab channel. The same filler channel code can be repeated as necessary for any number of lines.

Channel 1—The top-of-form code, reserved as the first line on the form or the first line printed (top-of-form position). The operating program sends the channel 1 code to advance to the top of the next form. After the memory is loaded, a Form Feed code (FF, hex 0C) moves the paper to the next channel 1 (top-of-form).

Channels 2 through 11, 13 and 14—Used as general channel codes (line identification codes) or filler channels. Each line on the form must be identified by a channel code. When the operating program sends the channel code, the paper advances to the line identified by the channel code. Lines not used by the operating program must be identified by filler channels (unused channel codes).

Channel 12—Reserved as the Vertical Tab channel. The Vertical Tab code (VT, hex 0B) prints any data in the print buffer and slews the paper to the next line identified by the channel 12 code. If channel 12 is not loaded in the EVFU memory when a VT code is sent, a single line feed is executed.

Channel 15 and 16—Used as general channel codes or filler channels only when the VFU is accessed by the PI signal line. In an EVFU form that does not use the PI line, the codes for Channels 15 and 16 function as the Start Load and End Load codes.

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