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CHAPTER 7: Interactive Operation
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7. Interactive Operation
The A/S-4 operating in the Interactive mode, emulates an IBM 3274/76 cluster controller with a single
LU Type 2 terminal IBM 3278 and an IBM 3287 LU Type 1 or 3 printer. The VDU LU assigned by the H-
Application Option menu is the terminal’s (IBM 3278) logical unit and the PRT LU is the printer’s (IBM
3287) logical unit. With the combination of these two LUs the CRT operator can have a job being
printed out on the printer while doing other interactive work with the terminal simultaneously.
As described in Section 6.4 on the actual running of the A/S-4 after all menu items are selected the
“WAITING FOR ACTIVE LU” message will be displayed on the terminal. After the LUs become active
the operation of the unit is dependent on the SNA host it’s communicating with, so no further
description of operation is needed.
NOTE
For the Interactive screen to be displayed correctly, the CRT must be selected to
disable cursor auto wrap. If a character is in column 80, the cursor will not advance to
the next line.