Back to the wayback machine - who remembers subfiles?

I've got an oldtimey subfile question...

I've got a display file that currently shows two subfiles.  Each has 35 
entries, five per line.  They use SFLPAG(35), SFLSIZ(35) and SFLLIN(5).  This 
sets up a nice array of 35 enterable fields.

I'd like to double the number of entries and still leave the screen handling 
under the control of the display file.  I can't for the life of me figure out 
how to do it.  I tried simply bumping SFLSIZ to 70, but when I do that, I can't 
use the roll keys.  So I added the ROLLUP and ROLLDOWN keys, and, as I 
expected, hitting a roll key acts in the program as if I hit enter.  I don't 
want to return to the program, I simply want to roll back and forth through the 
two pages.

What's the magic combination of keywords that allow this to happen?

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