Mhz Operation; The Fast And Slow Commands - Commodore 128 System Manual

Q Erase everything from the cursor to the end of the line
R Reverse screen display (80-column only)
S Change to block cursor ( ■ )
T Set the top left corner of the screen window (at the
current cursor location)
U Change to underline cursor ( _ )
V Scroll screen up one line
W Scroll screen down one line
X Toggles between 40 and 80 columns
Y Restore Default TAB stops
Z Clear All TAB stops
Experiment with the ESCape key functions. You will probably find
certain functions more useful than others. Note that you can use
the usual INST/DEL key to perform text editing inside a window
as well.
When a window is set up, all screen output is confined to the
" box" you have defined. If you want to clear the window area,
press SHIFT and CLEAR/HOME together. To cancel the window,
press the CLEAR/HOME key twice. The window is then erased,
and the cursor is positioned in the top left corner of the screen.
Windows are particularly useful in writing, listing and running
programs because they allow you to work in one area of the
screen while the rest of the screen stays as is.

2 MHz OPERATION

The FAST and SLOW Commands

The 2 MHz operating mode allows you to run non-graphic
programs in 80-column format at twice the normal speed. You
can switch normal and fast operation by using the FAST and
SLOW commands.
The FAST command places the Commodore in 2 MHz mode. The
format of this command is:
FAST
The SLOW command returns the Commodore 128 to 1 MHz
mode. The format of this command is:
SLOW
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