3290 terminals

On 3290 terminals, in addition to splitting the screen horizontally, you can use the SPLITV command to split the screen vertically, for a total of four logical screens. In the case of the 3290 terminal, four is the maximum number of screens possible. (The SPLITV function is not active if the data being displayed on a screen is more than 80 characters wide.) Figure 1 shows the effect of SPLIT and SPLITV, starting in single-screen mode.

Figure 1. Splitting the 3290 Screen

Note:

ISPF logical screens are separate subtasks that do not share subpool 0 (attached with SZERO=NO parameter.) Thus, VSAM data sets cannot be accessed from more than one logical screen.
If you are in a VSAM application, perform a split screen operation, then enter another VSAM application in the second session, you must be sure to end the second session before you end the first session, or an abend can occur.
On 3290 hardware, using the jump function to move from screen to screen might result in the loss of data that has been typed but not processed. The use of the 3290 hardware jump is not recommended.
In split-screen mode, if you type a command on the command line and swap screens before pressing Enter, the command is erased.
You cannot start ISPF in GUI mode if you are configured to run ISPF in 3290 partition mode.