Atari 800 User Manual

Atari Printers 255
On either the Atari 820,822, or 825, if an LPRI NT statement does
not end with either a comma or semicolon, output from the next
LPRINT statement will begin at the beginning of the next line.
LPRINT uses channel 7 for printer output. If channel 7 has
already been opened for another device, an error will occur
when LPRINT is executed. This error will automatically close
channel 7, after which LPRINT can be executed.
PRINT# and PUT
Either the PRINT# or PUT statements can be used to send output
to the printer. PRINT# and PUT direct output to a channel
previously opened via an OPEN statement. If the channel was
opened for the printer (device P:) , the output for that channel
will be directed to the printer .
Characters are
output to the printer via PRINT# and PUT in the
same manner as they are output to the display screen.
The
printer must be powered on when a PRINT# or PUT
statement outputs data to the printer . If not, an error will occur.
PRINTER BUFFER
The Atari printers contain enough RAM to hold one line of
output. This memory is known as the printer buffer. As
characters are output to the printer, these are not automatically
printed but are instead sent to the printer buffer.
When either an EOL character is encountered or when the
buffer fills, an entire line will be output. The buffer will be
cleared, and the printer will advance to the next line.
PRINTER CHARACTERS SETS
The Atari printers use a character set that is somewhat different
than the character set used by the video display. The Atari
printers use the standard ASCII code set to define their character
set. The display sc reen uses the Atari ASCII code set. Both code
sets are listed in Appendix C.

Atari 800 Specifications

General

Processor	MOS Technology 6502
Processor Speed	1.79 MHz
ROM	10 KB
Graphics	ANTIC and GTIA chips
Release Year	1979
Display Resolution	up to 320 x 192
Colors	128 colors
Sound	4 channels
Storage	Cartridge, cassette, floppy disk
Ports	Cartridge, serial, monitor
Operating System	Atari OS