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Atari 400 Service Manual

Atari 400
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Figure 3-4. SHIFT Keyboard and Key Combination
Screen Editinq Functions
SHIFT CLEAR or CTRL CLEAR - When held down simultaneously erases
all characters on the screen and moves the cursor to the home
position at the upper left corner of the screen.
CTRL and the UP arrow, DOWN arrow, RIGHT arrow, LEFT arrow - These
cursor control functions move the cursor on the screen in the
direction shown by the arrows on the keytops. When you move the
cursor over a letter, that letter is shown in inverse video on the
screen. When you move the cursor away from it using the cursor
controls the letter is unchanged. If you put the cursor over a
character, and then push another character key, the new character
will replace the one previously shown.
SHIFT and INSERT - This combination of keys creates a space for a
new line by rnoving the logical line containing the cursor and all
lines below it down one line. The information on the bottom line
of the screen that is pushed off will be lost.
CTRL and INSERT - This combination of keys creates a space for a
new character by moving the character under the cursor to the
right. The rest of the line also shifts to the right. The cursor
remains on the space which is now available for the new character.
3-6 System Service Manual

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Atari 400 Specifications

General IconGeneral
ManufacturerAtari
Model400
TypeHome Computer
Release Year1979
CPUMOS Technology 6502
CPU Speed1.79 MHz
ROM10 KB
Operating SystemAtari OS
KeyboardMembrane keyboard
RAM8 KB (expandable to 48 KB)
GraphicsANTIC and GTIA chips
Sound4 channels
DisplayRF output for connection to TV
StorageOptional cassette tape drive or floppy disk drive
PortsCartridge
Display Resolution320x192 (16 colors)

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