Atari 400 User Manual

Atari 810 Disk Dri ve 213
Disk Files
The Atar i 810 stor es data in files. A disk fil e ca n co ntain eit h er a
BASIC program , a mac hin e language pro gram , or da ta . An Atari
diskett e can contain as many as 64 fil es.
Files
are ass i gned uniqu e filenames of up to eig ht characters. The
first charac
ter of a filename mu st be a capita l le tt er. Subsequent
filename c har acters ca n eit her be cap it al l ette rs or numb ers.
Blank spaces, punctuation mark s, and s pecial c haract e rs (# , $ ,@ )
are not all owed in filenames.
Fil en am es can al so con ta in a filename extension of thr ee or
few er characte rs. Th e fil e nam e and filename extens ion mu st be
separated
with a pe riod. Fil ename extensi o ns ca n conta in e ith er
le tter s or numbers.
Filename extensions are o ft en us ed to in dicate the typ e of file.
The im p li ed m ea nin gs of co mm only used file nam e ex ten s ions
are listed in Table 7- 1.
Filename Match Characters
Atari DOS all ows the u se of the fi lena me match characte rs,? a nd
*. Th ese character s ca n be u se d to sta nd for any single characte r
(?) or group of ch aracte rs (*). For exa mpl e, FILE?.DAT wou ld
mat ch the following filenam es .
FILE1.DAT
FILEZ.DAT
FILE?DAT wou ld n ot mat ch th e following filenames:
FILE . DAT
FIL E1 . BAS
FILE. * would match any of the fo ll owi ng filenames.
FILE . BAS
FILE.TXT
FIL E.
DAT

Atari 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)