Atari 800 (NTSC)
Atari 800 (NTSC)

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Info
   
Setname:  a800   
Year: 1979
Manufacturer: Atari
Status: good  works
Type: Home Computer
Clones: Atari 1200XL,
Atari 800 (PAL)
Emulation info
   
Overall emulation:  good   
Color emulation:  good  
Sound emulation:  good  
Graphics emulation:  good  
Savestates:  unsupported   

Tech info
 Base hardware: (available in all slot configurations)
Chips
M6502 ("maincpu")cpu 1789790 Hz
POKEY ("pokey")cpu 1789790 Hz
Speaker ("mono")audio
POKEY ("pokey")audio 1789790 Hz
DAC ("dac")audio
Screens
Screen ("screen")raster horizontal 336 x 225 @ 59.923329
Media devices
floppydisk ("fdc:floppy0") floppydisk1 flop1 atr, dsk, xfd
floppydisk ("fdc:floppy1") floppydisk2 flop2 atr, dsk, xfd
floppydisk ("fdc:floppy2") floppydisk3 flop3 atr, dsk, xfd
floppydisk ("fdc:floppy3") floppydisk4 flop4 atr, dsk, xfd
cartridge ("cartleft") cartridge1 cart1 bin, rom, car
cartridge ("cartright") cartridge2 cart2 bin, rom, car
BIOS options
default OS Rev. B
reva OS Rev. A
RAM options
48K 49152
Software lists
a800_floporiginal
a800original
xegsoriginal

 Optional hardware: (available with specific slot configurations)

 Configure the slot options for a800:
 Slot Value
 sio 
 


Show detailed info about 'Configurations' of this system
Configurations

NameValue
Television Artifacts Off
 On


Show detailed info about 'Slot Options' of this system
Slot options

NameValueCompatible device(s)
sio cassettea8sio_cass

Romset info
ROM NameSizeCRC32SHA1Dump StateBIOS option
co12399b.rom2048 6a5d766e01a6044f7a81d409c938e7dfde0a1af5832229d2good
co12499b.rom4096 d818f3e8bcdec2188f6a6a5bfc1df4e383bd828d34b5c4acbaddumpdefault
co14599b.rom4096 c1690a9bc5248e8565574fd39ae1c3f4f356aa4cac07df95baddumpdefault
co12499a.rom4096 29f64e17abf7ec488c6b600f1b7f30bdc7f8a2bf6a727675baddumpreva
co14599a.rom4096 bc533f0ce217148495fa747fe5488132d8d22533e68c7e58baddumpreva
Sysinfo



Features


* CPU: MOS 6502 1.79MHz
* Co-Processors: ANTIC (Scrolling, Sprites, Video), CTIA / GTIA (Color, Sprites, Collisions), POKEY (Timers, Sound, Keyboard, Serial I/O), PIA 6810 (I/O including controller ports)
* RAM: 8K base, up to 48K (with memory expansion boards)
* ROM: 10K
* Display: 24 x 40 text, 320 x 192 monochrome, 160 x 96 with 128 colors
* Expansion: 4 internal expansion slots, 2 cartridge slots
* Ports: 4 controller ports, RGB video output, TV video output
* Keyboard: QWERTY full stroke keyboard with 62 keys, 4 function keys (Reset, Option, Select, Start)
* Storage: external 5.25" floppy drive, cassette recorder
* OS: Atari OS


Usage


Currently, MESS supports the following Atari 800 versions:

* a800 [Atari 800 (NTSC)]
* a800pal [Atari 800 (PAL)]

Both drivers support up to two cart slots for cart dumps in .rom and .bin format, using the "cartridge1" (cart1) and "cartridge2" (cart2) devices, and up to four floppy drive for disks in .atr, .dsk and .xfd format, "floppydisk1" (flop1) to "floppydisk4" (flop4).

Keyboard

These systems require full keyboard emulation to work correctly. At startup, full keyboard emulation mode is enabled by default. Whilst in full keyboard emulation mode, some key associated functionality may be disabled (like the ESC key for EXIT). The keyboard emulation mode is toggled using the "Scroll Lock" key (by default).

Original Keyboard: QWERTY full stroke keyboard, 62 keys plus 4 function keys on the right

CLEAR INSERT DELETE SYSTEM
ESC 1! 2" 3# 4$ 5% 6& 7' 8@ 9( 0) < > BACK S BREAK RESET

CLF SET UP _ DOWN |
TAB Q W E R T Y U I O P - = RETURN OPTION

LEFT \ RIGHT ^ CAPS
CTRL A S D F G H J K L ;: + * LOWR SELECT


SHIFT Z X C V B N M ,[ .] /? ATARI SHIFT START


SPACE

Keys "TAB", "-", "=", "+" and "*" have 3 functions.


Known Issues


Most disk and cartridge images should work, though some graphic issues may exist.


History and Trivia


The Atari 400 and 800 were the first home computers to use custom coprocessors and the first to use "sprites" and special video interruptions like display lists, features that will be implemented several years after on the Commodore Amiga. It offered high graphic resolution, lots of colors and great sound capabilities, more than other computers could do then! The two models had same characteristics, but the 800 had 48 KB of RAM (instead of 16 kb), two cartridge ports (only one for the 400) and a proper mechanical keyboard (a membrane keyboard for the 400).

In fact the very first Atari 800 Computers were shipped with 8 or 16 KB memory, expandable to 48 KB. After initial release, the 800 came standard with 48 KB memory.

Prior to production, the 800 was known inside Atari as code name "Colleen". It is rumored that Colleen and Candy (the 400 code name) were actually secretaries at Atari.

Many peripherals were product for the 800. Among these we recall: Atari 810 floppy drive, Atari 820 impact dot-matrix printer, Atari 850 Interface Module, Atari 830 Acoustic Couple Modem and Atari 835 Direct Connect Modem.

The floppy drive uses single-sided 5 1/4-inch floppy disks, holding 90K of data on a disk. The data is transfered in serial format at 19200 baud. Up to 4 drives can be hooked up.

The printer can produce 40 columns of 5x7 characters, at approximately 40 characters per second.

The 810 and 820 are considered "intelligent" peripherals - they have built-in processor chips which lighten the load on the computer's main processor. They can each be plugged directly into the Atari 400 or 800, with no other inteface required.

The Interface Module provides 4 separate RS-232-C serials ports and a single Centronics compatible printer port. It plugs into one of the controller jacks on the computer, which are actually both input/output, analog and digital ports. The Acoustic Couple Model requires both the Atari 850 Interface Module and the TeleLink I ROM cartridge to operate. On the other hand, the Direct Connect Modem requires only the Atari Telelink II ROM cartridge (and not the Interface Module) to operate.

Additional accessories include the external keypad, for fast data entry and the cassette tape drive, cheaper than the floppy drive but less reliable too.

In 1983, Atari released the 800XL computer. It has the same CPU as the Atari 800, and runs at the same speed. Basically a cheaper version of the 800, it is supposed to be compatible with all Atari 800 software and peripherals, but it isn't. Improvements include: 64K base RAM vs. 8K, parallel I/O port (PBI), general purpose I/O port.

(info from old-computers.com)


Links


* Atari 800 at the Atari Hystory Museum -- http://www.atarimuseum.com/computers/8BITS/400800/ATARI800/A800.html
* Atari 800 at vintage-computer.com -- http://www.vintage-computer.com/atari800.shtml
* Atari 800 at old-computers.com -- http://www.old-computers.com/museum/computer.asp?c=460


Other Emulators


* Atari800 (Unix, Amiga, MS-DOS, Atari TT/Falcon, SDL, WinCE) -- http://atari800.sourceforge.net/
* Atari++ -- http://www.math.tu-berlin.de/~thor/atari++/
* Atari800Win Plus -- http://www.a800win.atari-area.prv.pl/
* Rainbow (historical) -- http://www.chrislam.co.uk/
* PC Xformer (historical) -- http://www.emulators.com/xformer.htm



Edit the History info for this game.

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