# Terminal Functions

> [HTML Version](terminalfunctions.htm)


| **Tab** | **Description** |
|------|------|
| (x) | One dimensional typewriter-style Tab to column x. |
| (x,y) | Two dimensional cursor positioning: row x, column y. |
| (-1,x) | [Original Functions](originalfunctions.htm.md). |
| (-2,x) | Set Foreground Color. Tab(-2,x) is implemented very much as under AMOS, although most AMOS applications were monochrome and thus you may not be familiar with this command. Set the foreground color to x, where x normally ranges from zero to seven (0=black, 1=white, 2=blue, 3=magenta, 4=red, 5=yellow, 6=green, 7=cyan). You can also specify color values from 8 to 15 but these are equivalent to the "dim" versions of colors 0-7. (It is actually possible to define these all independently, either in A-Shell/Windows or in most color terminal emulators, so that "dim" may be a misnomer. But from a programming standpoint, Tab(-2,x);Tab(-1,11) is equivalent to Tab(-2,x+8). Color values beyond 15 are mapped to the modulo-8 equivalent. Note that color is a "mode" attribute, meaning that it takes up no space on the screen and it stays in effect chronologically (rather than spatially) until overridden by another color.  |
| (-3,x) | Set the background color. Same as above, but for background color. |
| (-5,x) | Set Number of Rows. Tab(-5,x) sets the number of display rows to x. This was originally only available the AM65 and AM75 terminals, and x was essentially limited to 24 or 42. Under A-Shell, it is still limited to the display device, but in the case of A-Shell/Windows, the display device supports from 1 to 50 rows. In the case of ZTERM, it also supports from 1 to 50 rows. See [Selecting a Terminal Emulation](selectingaterminalemulation.htm.md). |
| (-6,x) | Set Number of Columns. Tab(-6,x) sets the number of display columns to x. This is purely an A-Shell extension and only applies to A-Shell/Windows, which supports from 1 to 160 columns. Dumb terminals and emulators are typically limited to 80 and perhaps 132 columns, which the Tab(-1,80) and Tab(-1,81) commands are designed to switch between. |
| (-10,x) | [ATE Functions](atefunctions.htm.md). |
| (x,y,z) | ["Three-D" Print Tab](three-dprinttab_ref.htm.md). |




**See Also**

•	[TRMCHR](trmchr_sbr.htm.md)[XS](keyword-types.htm.md) to query the current color and row/col settings, i.e. current values of the tab(-2,x), tab(-3,x), tab(-5,x) and tab(-x,6)