Editing Atari 130XE

{{Infobox computer
| name         = Atari 130XE
| image        = [[File:Atari_130XE.jpg|250px]]
| caption      = Atari 130XE Home Computer
| manufacturer = Atari Corporation
| type         = Home Computer
| release date = 1985
| discontinued = 1992
| price        = US$150 (1985)
| cpu          = MOS Technology 6502C @ 1.79 MHz (NTSC) / 1.77 MHz (PAL)
| memory       = 128 KB RAM (bank-switched), 24 KB ROM (OS + BASIC)
| storage      = External cassette tape (410/1010), optional 5.25" floppy disk drive (1050/XF551)
| display      = 320×192 pixels, 40×24 text, 16 colours (256 hue/luminance combinations via ANTIC/GTIA)
| sound        = POKEY: 4 voices, 8-bit, noise, envelope, keyboard scan
| dimensions   = 34 cm × 24 cm × 5 cm
| weight       = 1.2 kg
| os           = Atari OS (Rev. 2/3 in ROM), Atari BASIC Rev. C
| predecessor  = [[Atari 800XL]]
| successor    = [[Atari XE Game System]]
| codename     = —
| model        = 130XE
}}

The '''Atari 130XE''' is an 8-bit home computer introduced by Atari Corporation in 1985 as the flagship of the XE ("XL Enhanced") series. It is the most powerful standard-production model in the Atari 8-bit computer family, distinguished by its '''128 KB of bank-switched RAM''' — double the memory of any previous model. The 130XE maintains full backward compatibility with earlier Atari 400/800, XL, and XE software while offering expanded capabilities for RAM disk usage and more demanding applications.

The 130XE shares the same compact, light-grey wedge case styling as the [[Atari 65XE]], and was produced from 1985 until Atari Corporation officially dropped the 8-bit line on 1 January 1992. It was sold worldwide and became one of the most popular XE-series machines, particularly in European markets.

== Architecture and Processor ==

At its core, the 130XE uses the '''MOS Technology 6502C''' (Sally) microprocessor, a custom variant of the 6502 with a HALT input for DMA operations. It runs at:
* '''1.79 MHz''' (NTSC systems, derived from 3.58 MHz colour burst)
* '''1.77 MHz''' (PAL systems, derived from 3.54 MHz colour burst)

The CPU coordinates with Atari's custom chipset:
* '''ANTIC''' (CO21697 NTSC / CO21698 PAL) — Display list processor, handles video DMA and generates display instructions
* '''GTIA''' (CO14805 NTSC / CO14889 PAL) — Graphics Television Interface Adaptor, produces final colour video output, handles player/missile (sprite) graphics and colour interpretation
* '''POKEY''' (CO12294) — Pot Keyboard Integrated Circuit, handles sound generation, serial I/O, keyboard scanning, and paddle input
* '''PIA''' (CO14795 / 6520) — Peripheral Interface Adaptor, manages joystick port I/O and memory bank selection
* '''FREDDIE''' (CO61991) — Memory controller, generates RAS/CAS signals for DRAM, handles bus arbitration between CPU and ANTIC
* '''MMU''' (CO61618) — Memory Management Unit PAL, handles address decoding and chip select generation
* '''EMMU''' (CO25953) — Extended MMU, enables bank-switching of the additional 64 KB RAM

== Memory and Storage ==

The Atari 130XE is equipped with:
* '''128 KB RAM''' — organised as 16 × 64Kbit (4164) DRAM chips on early boards (CO70065/CO70067) or 4 × 256Kbit (4464/41464) DRAM chips on later cost-reduced boards (C103579)
* '''24 KB ROM''', comprising:
** 16 KB for the operating system (Atari OS Rev. 2 or Rev. 3)
** 8 KB for Atari BASIC (Revision C)

The extra 64 KB of RAM beyond the base 64 KB is accessed via bank-switching controlled through PIA port B (address $D301). Four 16 KB banks can be mapped into the $4000–$7FFF window, accessible to either the CPU, ANTIC, or both. This extended memory is commonly used as a RAM disk under Atari DOS 2.5 and later DOS versions (e.g. SpartaDOS).

Storage options include:
* '''Cassette tape drive''' (Atari 410/1010)
* '''5.25" floppy disk drive''' (Atari 1050, XF551, Indus GT)
* '''Cartridge slot''' for instant program loading (up to 16 KB standard, larger with bank-switching)

== Display and Graphics ==

Video output is managed by the '''ANTIC''' and '''GTIA''' chips working in tandem:
* Resolution up to '''320×192 pixels''' (Graphics mode 8) or '''160×192''' with 4 colours
* Text display: '''40 columns × 24 rows''' (ANTIC mode 2)
* '''16 colours''' simultaneously selectable from 256 possible hue/luminance combinations (16 hues × 16 luminances)
* GTIA extended modes provide 16-shade, 16-hue, and 9-colour modes at lower resolution
* Multiple graphics modes (ANTIC modes 2–F), with hardware vertical and horizontal fine scrolling
* '''Player/Missile Graphics''' (hardware sprites): 4 players (8 pixels wide) and 4 missiles (2 pixels wide), with priority control and collision detection

The XE series supports:
* '''Composite video''' output via 5-pin DIN monitor port (also carries separated luma/chroma for S-Video with adapter)
* '''RF modulated''' output via channel 2/3 switchable modulator

== Sound Capabilities ==

Audio is generated by the '''POKEY''' chip (CO12294), offering:
* '''4 independent audio channels''', each with 8-bit frequency divider
* Selectable clock base frequencies: 15 kHz, 64 kHz, or 1.79 MHz
* Channels can be linked in pairs for 16-bit resolution (two channels combined)
* Programmable polynomial counter noise generation (4-bit, 5-bit, 9-bit, 17-bit)
* Volume-only mode for digital audio playback (DAC)
* High-pass filter capability by clocking one channel with another

== Input/Output and Expansion ==

The 130XE provides:
* '''Cartridge slot''' — standard Atari 8-bit cartridge interface for software and hardware expansion
* '''SIO (Serial Input/Output) port''' — Atari's proprietary daisy-chain serial bus (active accent), connects disk drives, printers, modems, cassette drives
* '''Two joystick ports''' — DE-9 connectors compatible with Atari-standard joysticks, paddles, and light guns
* '''ECI (Enhanced Cartridge Interface)''' — an edge connector on the back panel replacing the XL-series PBI (Parallel Bus Interface), providing active accent access to the system bus for expansion devices
* '''Composite/monitor port''' — 5-pin DIN connector carrying composite video, separate luminance, chrominance, and audio output
* '''RF output''' — via built-in modulator

== PCB Revisions ==

The 130XE was produced on several motherboard revisions:

<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table" style="width:90%; text-align:center;"
! Board Number !! RAM Configuration !! Notes
|-
| CO70065 / CO70067 Rev B/C || 16 × 4164 (64K×1) || Early production, same board as 65XE with all RAM slots populated
|-
| C103579-001 Rev 1 || 4 × 41464 (64K×4) || Later cost-reduced board, fewer chips, slightly different layout
|}

== Gallery ==
<gallery mode="packed" heights="180">
File:Atari_130XE.jpg|Atari 130XE front view
</gallery>

== Related Pages ==
* [[Atari 130XE General Maintenance]]
* [[Atari 130XE Troubleshooting Guide]]
* [[Atari 130XE Capacitor Replacement Guide]]
* [[Atari 65XE]]
* [[Atari 800XE]]
* [[Atari XE Game System]]

{{Navbox-AtariVintageComputers}}
[[Category:Atari Systems]]