HARDWARE / UPGRADES
Memory and processor upgrades, video outputs, sound chips and SD card devices. Some connect externally; others require installation inside the computer.
An internal bank-switched RAM expansion with selectable operating systems and BASIC, and a real-time clock. Combined with a SIDE interface, it also provides disk handling and file loading. Settings are selected in the built-in menu.
Compatibility and installation
600XL upgraded to 64 KiB, 800XL, 65XE, 130XE, 800XE and XEGS. Installation requires MMU/ROM connections and soldering; the XEGS needs an appropriate hardware configuration.
An upgrade for the original Atari 800 with bank-switched memory, selectable ROMs, SpartaDOS X, a clock and CompactFlash support. It provides a first-generation-compatible Colleen mode and an XL/XE mode for newer software.
Compatibility and installation
For the original Atari 800. In Colleen mode, disk access requires SpartaDOS X and a driver; the board replaces the original RAM and ROM modules.
An external tool for freezing programs, inspecting and changing memory, and saving the computer's state. Useful for code analysis and debugging. The 2011 version adds cartridge emulation and battery-backed RAM, selectable without opening the Atari's case.
Compatibility and installation
600XL with at least 64 KiB and 800XL through PBI; 800XE, 130XE and ECI-equipped 65XE. It does not support the 65XE without ECI; some 800XL machines need power from the joystick port.
An accelerator with a 20 MHz 65C816 processor and fast memory. It provides the 65C816's additional instructions and larger address space. Operating modes are selected in a menu; older software compatibility depends on these settings.
Compatibility and installation
800XL with ADAPTUS and SRAM, plus 65XE, 130XE, 800XE and XEGS. XE/XEGS machines require checking EXTSEL; the XEGS also needs a suitable MMU.
A video expansion with RGB output, additional graphics modes, more colours, 80-column text and a blitter. VBXE-aware programs can display graphics beyond ANTIC and GTIA alone.
Compatibility and installation
800XL, 65XE, 130XE, 800XE and XEGS. The ANTIC adapter and wiring must match the motherboard; the manual covers XL, XE, XEGS and FREDDIE-equipped 800XLF separately.
Bryan Edewaard's circuit improves Atari's analogue video. It provides composite and separate luminance and chrominance for S-Video, reducing interference and improving pixel edges. It works with displays having analogue inputs.
Compatibility and installation
The manual covers 400, 800, 600XL, 800XL, 1200XL and 65XE/130XE. Wiring and jumpers depend on the motherboard; soldering is required. UAV does not provide HDMI output.
Simius's GTIA replacement provides digital DVI and analogue RGB, YPbPr and VGA outputs. Selectable display modes and palettes help match the signal to the monitor instead of using composite output.
Compatibility and installation
For 800XL, 1200XL and 130XE with PAL/NTSC GTIA. The board version and connector installation must be chosen appropriately; the monitor must support the selected display mode.
A modification adding a second POKEY and separate left and right channel outputs. It plays music written for two chips. Documentation includes a schematic, installation instructions, mono/stereo switching and audio circuit variants.
Compatibility and installation
The guide covers Atari 800XL and 65XE with different motherboards. Connection points depend on the version; software must support the additional POKEY.
An FPGA-based POKEY replacement. Features vary by version and include stereo, SID and PSG cores, and sample playback. It can replace the original chip or expand the computer's sound capabilities.
Compatibility and installation
PokeyMAX v4.5 fits Atari 400/800/XL/XE. Simply inserting it in the socket provides mono; full functionality requires additional address lines and audio connections.
A four-channel digital-to-analogue converter installed under PIA. It plays samples in programs supporting this Covox variant. Its address is selected during installation, and audio uses a separate connection.
Compatibility and installation
P-COVOX v2 for Atari 8-bit requires space under PIA, an address-selection connection and the correct clock signal. The player must support the Covox configuration.
An SIO adapter connecting Atari to Wi-Fi, serving disk images from microSD or TNFS servers. It also emulates a printer and modem. The N: device lets programs use network protocols. It can coexist with a physical drive under another drive number.
Compatibility and installation
The Atari SIO version supports 400/800, XL/XE and XEGS. For 400/800, the documentation recommends USB power before starting the computer. Networking requires 2.4 GHz Wi-Fi; N: needs a driver.
An SIO disk drive emulator storing images on SD or MMC cards. ATR files can be read and written, with buttons and a display assigning images to virtual drives. The project also includes an Atari configuration program and XEX support.
Compatibility and installation
Atari 8-bit computers with SIO. The card requires FAT and an ATARI directory; SDHC support, drive count and high-speed transfer modes depend on firmware.
An Arduino-based floppy disk and cassette emulator. A touchscreen selects microSD images, changes media during use and chooses the boot drive. The project includes an SIO schematic and documentation for supported displays.
Compatibility and installation
Atari 8-bit computers with SIO. Building it requires an Arduino and display specified in the documentation; the author recommends a separate power supply, particularly with other devices on the bus.
An SD card cartridge for running XEX programs, emulating cartridges and mounting ATR images. Its loader browses and copies files, creates disk images, and reads and writes FAT partitions. Ultimate 1MB integration also provides operating system disk support.
Compatibility and installation
Atari 8-bit computers with a cartridge slot; features depend on hardware and firmware revision. ATR support is limited without Ultimate 1MB; documentation covers Lattice and GoWin versions separately.
An evolution of AVGCART combining an SD card cartridge with further expansion features. A PBI or ECI cable provides extended RAM and a battery-backed clock. A separate audio cable enables stereo POKEY and COVOX emulation without installing those chips inside the Atari.
Compatibility and installation
PBI: 600XL and 800XL; ECI: 130XE, 800XE and ECI-equipped 65XE. Extra features require the appropriate cable; the manufacturer advises against use with U1MB and other internal RAM expansions.
An ICD upgrade replacing two chips in the Atari 1050. It adds double density with 256-byte sectors, used by compatible DOS software; a standard 1050 supports only SD and ED.
Compatibility and installation
Atari 1050 only, not 810 or XF551. Installation requires a working drive and correct jumper settings. DD writing requires a compatible DOS.
Compy Shop's Atari 1050 upgrade: track buffering, double density and faster transfers. Utilities provide sector copying and configuration. Speedy and Mini-Speedy variants differ in features such as a track-number display and audible signals.
Compatibility and installation
Atari 1050 only. High-speed transfers require software support. Older programs may need Slow mode or the original drive operating system.
A board adding read/write buffering and DD double density to the Atari 1050. The Warp Speed package contains diagnostics, a sector copier and mode configuration tools. The drive still connects to the computer through standard SIO.
Compatibility and installation
Atari 1050 only; Happy 810 is a separate upgrade. High-speed transfers depend on ROM and software. Incompatible programs may need Slow or Unhappy mode.
A joystick modification adding one or two independent buttons alongside FIRE. It uses Atari's paddle inputs. Extra buttons work in programs supporting Joy2B+. Installation involves the joystick and its cable.
Compatibility and installation
Designed for Atari XL/XE. Installation requires modifying the joystick and using a cable connected to all nine plug pins.
An interface for connecting eight joysticks to Atari XL/XE. The Atari8Bit project uses Radek Štěrba's schematic and includes a parts list and board construction guide.
Compatibility and installation
MultiJoy8 connects to both Atari XL/XE joystick ports. It works with games and programs supporting the MultiJoy standard.
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