Editing Atari 5200

{{Infobox computer
| name         = Atari 5200
| image        = [[File:Atari-5200-4-Port-wController-L.jpg|250px]]
| caption      = Atari 5200 4-port model with controllers (1982)
| manufacturer = Atari, Inc.
| type         = Home video game console
| release date = November 1982 (4-port)<br>May 1983 (2-port)
| discontinued = 21 May 1984
| price        = US$269 (1982)
| cpu          = MOS 6502C "Sally" @ 1.79 MHz
| memory       = 16 KB RAM
| storage      = ROM cartridge (4 KB - 32 KB)
| display      = 384 × 240 pixels maximum, 256 colors (16 hues × 16 luminance)
| sound        = POKEY 4-channel PSG
| dimensions   = 330 mm W × 260 mm D × 95 mm H
| weight       = 2.0 kg (4-port)
| os           = 2 KB BIOS (1 KB character ROM)
| predecessor  = [[Atari 2600]]
| successor    = [[Atari 7800]]
| codename     = PAM, Super Stella, Video System X
| model        = CX5200
}}

The '''Atari 5200 SuperSystem''' is a home video game console released by Atari, Inc. in November 1982. Based on the architecture of the Atari 8-bit computer line, the system features the 6502C processor running at 1.79 MHz alongside the custom ANTIC, GTIA, and POKEY chips. The console was discontinued on May 21, 1984, after selling approximately 1 million units.

== System Architecture ==
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:70%; text-align:center;"
! Sub-system !! Specification
|-
| '''CPU''' || MOS 6502C "Sally" @ 1.79 MHz<br>Custom 6502 variant with HALT line for DMA operations
|-
| '''Graphics''' || GTIA (CO14805 NTSC / CO14889 PAL)<br>256 colors from palette of 256 (16 hues × 16 luminance)
|-
| '''Display Controller''' || ANTIC (CO12296)<br>Alphanumeric Television Interface Controller<br>Hardware display list processing, character/bitmap generation
|-
| '''Audio/I/O''' || POKEY (CO12294)<br>4-channel square wave/noise generation<br>Keyboard scanning, serial I/O, timers
|-
| '''RAM''' || 16 KB (8× 4516 DRAM chips @ 150ns)
|-
| '''ROM''' || 2 KB BIOS (CO19156A)<br>1 KB character set, 1 KB boot/initialization code
|-
| '''Video Modes''' || 14 display modes<br>Text: 40×24, 20×24, 20×12 characters<br>Graphics: 320×192 (2 colors), 160×192 (4 colors), 80×192 (16 colors)
|-
| '''Sprites''' || 4 players (8 pixels wide) + 4 missiles (2 pixels wide)<br>Hardware collision detection
|-
| '''Controller Ports''' || 4 ports (4-port model) or 2 ports (2-port model)<br>Analog joystick with 12-key keypad support
|}

== Memory Map ==
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:70%; text-align:center;"
|+'''6502C Address Space'''
! Range !! Size !! Purpose
|-
| $0000-$3FFF || 16 KB || RAM
|-
| $4000-$BFFF || 32 KB || Cartridge ROM space
|-
| $C000-$C0FF || 256 bytes || GTIA chip registers
|-
| $D400-$D5FF || 512 bytes || ANTIC chip registers
|-
| $E800-$E8FF || 256 bytes || POKEY chip registers
|-
| $F800-$FBFF || 1 KB || Character set ROM
|-
| $FC00-$FFFF || 1 KB || System ROM/BIOS
|}

== Custom Chip Registers ==
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:80%; text-align:center;"
|+'''Key Hardware Registers'''
! Chip !! Address Range !! Function
|-
| '''GTIA''' || $C000-$C01F || Player/missile graphics, collision detection
|-
| || $C020-$C02E || Color palette registers
|-
| || $C02F || Console keys (Start/Select/Option)
|-
| '''ANTIC''' || $D400-$D40F || Display list, DMA control, interrupts
|-
| || $D410-$D5FF || Hardware scrolling, display mode
|-
| '''POKEY''' || $E800-$E80F || Audio frequency/control registers
|-
| || $E810-$E81F || Paddle/keyboard input, serial I/O
|}

== Model Variants ==
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:90%; text-align:center;"
|+'''Production Models'''
! Model !! Years !! Ports !! PCB !! Key Features
|-
| '''4-Port Original''' || 1982-1983 || 4 || CA018087 || Combined power/RF switchbox, controller storage
|-
| '''4-Port Universal''' || 1983 || 4 || CA020108 || CX55 2600 adapter compatible (with asterisk serial)
|-
| '''2-Port''' || 1983-1984 || 2 || CA021374 || Separate power supply, standard RF switch, CX55 compatible
|}

The 4-port models use a unique switchbox that combines RF output with power delivery through a single cable. The 2-port model reverted to a conventional separate 9V DC power adapter and standard RF switch box.

== Motherboard Revisions ==
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:90%; text-align:center;"
! PCB Number !! Controller Ports !! ICs !! Notes
|-
| CA018087 || 4 || 28 || Original design, not CX55 compatible without modification
|-
| CA020108 || 4 || 26 || Universal board, late units with asterisk serial support CX55
|-
| CA021374 || 2 || 24 || Cost-reduced, natively supports CX55 2600 adapter
|}

== General Maintenance ==
{{Main|Atari 5200 General Maintenance}}

The Atari 5200 requires periodic maintenance to address controller degradation and RF modulator oxidation. The non-centering analog controllers are prone to flex circuit failure and require regular cleaning of the carbon contacts with isopropyl alcohol. The 4-port model's combined power/RF switchbox frequently develops cold solder joints that cause intermittent power loss. Controller storage compartments should be kept clean to prevent dust accumulation on the exposed controller ports.

== Troubleshooting Guide ==
{{Main|Atari 5200 Troubleshooting Guide}}

Common failures include blank screens from dirty cartridge edge connectors, controller drift from worn potentiometers, and power issues in 4-port models from faulty switchbox connections. The POKEY chip (CO12294) can fail causing loss of controller input or audio. Video problems often stem from failed GTIA (CO14805) or aging electrolytic capacitors. The 7805 voltage regulators run hot and may require heatsink replacement or upgraded thermal compound.

== Capacitor Replacement ==
{{Main|Atari 5200 Capacitor Replacement Guide}}

Critical capacitors include the main filter capacitors near the voltage regulators and various bypass capacitors throughout the board. The 4-port models contain larger filter capacitors due to the switchbox power design. All electrolytic capacitors should be replaced with 105°C rated equivalents. The styrene capacitors used for audio coupling are particularly failure-prone and should be replaced with polystyrene or ceramic types.

== Power Supply ==
The power requirements differ between models:
* '''4-Port Models:''' 9.3V AC @ 3.5A via switchbox
* '''2-Port Models:''' 9V DC @ 1.95A via barrel jack (5.5mm × 2.1mm, center positive)

Internal regulation provides:
* '''+5V:''' Logic supply via dual 7805 regulators (VR1, VR2)
* '''Unregulated:''' Direct to analog circuits

Both voltage regulators should measure 4.85-5.15V output. Heat sinking is critical as regulators run at elevated temperatures.

== Controller System ==
The 5200 controllers use analog potentiometers for X/Y positioning with a 12-button keypad matrix and dual fire buttons. Key specifications:
* '''Potentiometers:''' 500KΩ linear taper
* '''Keypad:''' 4×3 matrix scanned by POKEY
* '''Flex Circuit:''' Carbon traces on mylar substrate
* '''Connection:''' 15-pin connector per port

The non-centering design uses a rubber boot instead of springs, leading to the notorious control issues. The flex circuits deteriorate over time, causing button failures.

== Cartridge Slot ==
The 36-pin edge connector accepts cartridges up to 32 KB:
* '''Standard 4K/8K:''' Direct mapped
* '''16K:''' Two 8K banks
* '''32K:''' Four 8K banks (rare)

Unlike the 2600, the 5200 cannot use bank-switching schemes beyond basic 32K mapping due to BIOS limitations.

== Video Output ==
The system generates composite video internally, output through RF modulator on channel 2 or 3:
* '''Horizontal:''' 228 color clocks per line
* '''Vertical:''' 262 lines (NTSC), 312 lines (PAL)
* '''Frame rate:''' 59.92 Hz (NTSC), 49.70 Hz (PAL)
* '''Color burst:''' 3.579545 MHz (NTSC)

Common modifications include composite and S-Video output by tapping signals from the GTIA chip.

== Audio System ==
POKEY generates four independent audio channels:
* '''Frequency control:''' 8-bit divisor
* '''Volume:''' 4-bit per channel (0-15)
* '''Waveforms:''' Pure tone, polynomial noise
* '''Clock source:''' 1.79 MHz or 64 kHz

Audio output is mixed to mono and routed through the RF modulator or can be tapped for line-level output modifications.

== Common IC Identification ==
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:70%; text-align:center;"
! Atari Part !! Function !! Location
|-
| CO14806 || 6502C CPU || A2/U2
|-
| CO12296 || ANTIC || A3/U3
|-
| CO14805 || GTIA (NTSC) || A5/U5
|-
| CO14889 || GTIA (PAL) || A5/U5
|-
| CO12294 || POKEY || A7/U7
|-
| CO19156A || ROM/BIOS || A8/U8
|}

== Controller Port Pinout ==
<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:70%; text-align:center;"
|+'''15-pin Controller Connector'''
! Pin !! Signal !! Function
|-
| 1 || Keypad Row 0 || Keyboard matrix scanning
|-
| 2 || Keypad Row 1 || Keyboard matrix scanning
|-
| 3 || Keypad Row 2 || Keyboard matrix scanning
|-
| 4 || Keypad Row 3 || Keyboard matrix scanning
|-
| 5 || Keypad Column 2 (Reset) || Reset button input
|-
| 6 || Keypad Column 0 || Keyboard matrix scanning
|-
| 7 || +5V || Power supply
|-
| 8 || Keypad Column 1 || Keyboard matrix scanning
|-
| 9 || POT0 (Horizontal) || X-axis potentiometer
|-
| 10 || POT1 (Vertical) || Y-axis potentiometer
|-
| 11 || +5V || Power supply
|-
| 12 || Fire Button (Bottom) || Secondary fire button
|-
| 13 || Fire Button (Top) || Primary fire button
|-
| 14 || Ground || Common ground
|-
| 15 || NC || Not connected
|}

== Technical Specifications Summary ==
* '''Clock Speed:''' 1.79 MHz (NTSC), 1.77 MHz (PAL)
* '''Colors:''' 256 (16 hues × 16 luminance levels)
* '''Resolution:''' Up to 384×240 overscan, 320×192 standard
* '''Sprites:''' 4 players + 4 missiles, hardware collision detection
* '''Sound:''' 4-channel square wave/noise generation
* '''Controllers:''' Analog with 360° non-centering movement

== Service Information ==
Service documentation is available in the CX5200 Field Service Manual. The system uses all through-hole components except for some RF modulator sections. Common replacement parts:
* '''7805 voltage regulators:''' Standard TO-220 package, 1A minimum
* '''Power jack (2-port):''' 5.5mm × 2.1mm barrel connector
* '''Controller port connectors:''' 15-pin card edge
* '''Cartridge connector:''' 36-pin (2×18) edge connector

== Schematics ==
{| class="wikitable styled-table"
|+Atari 5200
!Motherboard
!RF Switch Box
!Accessories
|-
|[[File:Schematic Atari5200 4000.png|thumb|315x315px|Atari 5200 Console Schematic]]
|[[File:Schematic Atari5200 RFSwitchbox 2000.png|thumb|Atari 2600 RF Switchbox Schematic]]
|[[File:Schematic Atari5200 Accessories 2000.png|thumb|Atari 5200 Accessories Schematic]]
|}

== Related Pages ==
* [[Atari 5200 General Maintenance]]
* [[Atari 5200 Troubleshooting Guide]]
* [[Atari 5200 Capacitor Replacement Guide]]
* [[Atari 2600]]
* [[Atari 7800]]

[[Category:Atari Systems]]