NP Next Page

Move to another page of display memory, on terminals that have more than one.

CSI Pn U

Defaults: Pn = 1
ECMA-48: §8.3.87 NP – Next Page, p. 51
DEC STD 070: §5.4.7 Next Page, p. 5-77
VT510: NP—Next Page

Some DEC terminals keep several pages of display memory, of which the screen shows one. These five functions move the cursor among them:

Sequence	Function	Moves the cursor to
`CSI Pn U`	NP, next page	the home position, `Pn` pages on
`CSI Pn V`	PP, preceding page	the home position, `Pn` pages back
`CSI Pn SP P`	PPA, page position absolute	the same line and column on page `Pn`
`CSI Pn SP Q`	PPR, page position relative	the same line and column, `Pn` pages on
`CSI Pn SP R`	PPB, page position backward	the same line and column, `Pn` pages back

That is DEC STD 070’s definition, in §5.4.7 from p. 5-77. A request past the last page goes to the last page, and one before the first goes to the first. ECMA-48 defines NP and PP as showing another page, and says their effect on the cursor “is not defined by this Standard”; its PPA, PPR and PPB are §8.3.96, §8.3.98 and §8.3.97, all on p. 53. The VT510 manual has PP, PPA, PPR and PPB.

DEC STD 070 makes page movement part of levels 3 and 4 only. libghostty-vt has a single page and identifies itself as a level 2 terminal (see DA), so it does not implement any of these, and DEC STD 070 says unimplemented functions “shall be ignored as if they were not received” (§3.5.1.3, p. 3-20). xterm does not implement them either.

Validation

NP-1: Ignored on a level 2 terminal

\e[2;3H
\e[U      # NP
X

|_____|
|__X__|
|_____|
cursor 2,4

NP-2: PP is ignored too

\e[2;3H
\e[V      # PP
X

|_____|
|__X__|
|_____|

NP-3: And the three with an intermediate byte

\e[2;3H
\e[2\sP   # PPA
\e[\sQ    # PPR
\e[\sR    # PPB
X

|_____|
|__X__|
|_____|