Editing Atari 7800 Documentation

Service and user documentation for the '''[[Atari 7800]]''' ProSystem. AtariAge members report that Atari never issued a field service manual for the 7800, so the schematic and the repair flowchart below are the main service documents.<ref name="aa265966" />

== Schematic Diagram 7800 (C025231-001) ==

''Schematic Diagram 7800'' is Atari, Inc.'s drawing C025231-001, revision A, a single E-size sheet dated 1984.<ref name="schem" /> It shows the whole NTSC console:

* the power input, the 4013 power latch (U10), the 2N3904 and MJE210 switch (Q9, Q10), the 7805 regulator (VR1) and the electrolytics C62, C61 and C22;
* MARIA (U1), the 6502 (U2), the 2K × 8 RAMs (U5, U6) and the BIOS ROM (U7), with notes on fitting a 24-pin or 28-pin ROM through jumpers W1 and W2;
* the TIA (U8), the 6532 (U9), the controller ports and the console switches;
* the master oscillator (Y1, 14.31818 MHz), the video summing network, the sound-carrier oscillator (Q1) and the RF modulator connection;
* the cartridge connector J1 and the J2 peripheral port with its pinout.

=== What it does not contain ===

* A parts list or voltage ratings: capacitors are given by value only.
* The PAL board (C300633-001) or the later C025233-002 timing circuit.
* Test-point voltages.

=== Pages that cite this document ===

* [[Atari 7800]]: hardware, power, video, expansion port
* [[Atari 7800 Capacitor Replacement Guide]]: capacitor values and positions
* [[Atari 7800 Troubleshooting Guide]]: power, clock and video checks
* [[Atari 7800 General Maintenance]]: power path
* [[Atari 7800 Composite Mod]]: video summing network and audio

<pdf width="800" height="500">File:Atari 7800 Schematic Diagram C025231-001.pdf</pdf>

Download: [[:File:Atari 7800 Schematic Diagram C025231-001.pdf|Atari 7800 Schematic Diagram C025231-001.pdf]]

== 7800 repair flowchart ==

A six-sheet flowchart preserved with the 7800 development documents on the Internet Archive. Its author and date are not printed.<ref name="flow" />

* Start: power button, +5 V on the chips, unregulated DC, the 5.1 V zener at U10 pin 14, U10 pins 3 and 13.
* F: the 2N3904 (Q9), the MJE210 (emitter 9 V or more, collector toggling) and the regulator.
* B: the diagnostic cartridge, the oscillator at MARIA pins 3 and 4, the clock at MARIA pin 8 and SALLY pin 39, and its distribution.
* C: reset at SALLY pin 40, the 74LS32 and the 4013.
* D: RDY (SALLY pin 2), HALT (pin 35) and IRQ (pin 4).
* E: MARIA or TIA video lines, the encryption latch (74LS174 and 74LS32), CVIDEO at pin 3 of the RF can, the video gates and the summing resistors.

The last box of sheet E is a joke ("drop-kick board, then smash with large hammer").

=== Pages that cite this document ===

* [[Atari 7800 Troubleshooting Guide]]
* [[Atari 7800 General Maintenance]]
* [[Atari 7800 Capacitor Replacement Guide]]

<pdf width="800" height="500">File:Atari 7800 Repair Flowchart.pdf</pdf>

Download: [[:File:Atari 7800 Repair Flowchart.pdf|Atari 7800 Repair Flowchart.pdf]]

== Atari 7800 ProSystem owner's manual ==

The owner's manual, Atari part number C024819-001 Rev. A, copyright 1986 Atari Corp., printed in Taiwan in 1987, has 12 PDF pages.<ref name="og" /> It covers the box contents, fitting the TV/game switch box, the channel switch, the console buttons, the Pro-Line controllers and the game-option menu, the difficulty switches for 2600 games, care of the console, and a set-up troubleshooting chart. It warns against using any other power adaptor or switch box.

=== Pages that cite this document ===

* [[Atari 7800]]: power adaptor
* [[Atari 7800 General Maintenance]]: care instructions, pause blanking
* [[Atari 7800 Troubleshooting Guide]]: set-up chart

<pdf width="800" height="500">File:Atari 7800 ProSystem Owner's Manual.pdf</pdf>

Download: [[:File:Atari 7800 ProSystem Owner's Manual.pdf|Atari 7800 ProSystem Owner's Manual.pdf]]

== Other 7800 documents ==

The same Internet Archive collection holds GCC's ''Maria'' chip specification (GCC1702B, 1984), 7800 software guides and the 7800 Trak-Ball and keyboard schematics. They are not hosted here.<ref name="ia" /> AtariAge members have shared a 7800 theory-of-operation archive and a parts list compiled by Mitch in the forum thread cited below.<ref name="aa265966" />

== References ==

<references>
<ref name="schem">Atari, Inc., ''Schematic Diagram 7800'', drawing C025231-001 Rev. A, 1984. [[:File:Atari 7800 Schematic Diagram C025231-001.pdf]]; source Internet Archive item 7800_NTSC_Schematic_Diagram_1984_U.</ref>
<ref name="flow">''7800 repair flowchart'', six sheets. [[:File:Atari 7800 Repair Flowchart.pdf]]; source Internet Archive item Repair_Flowchart (collection atari7800manuals).</ref>
<ref name="og">Atari Corp., ''Atari 7800 ProSystem'' owner's manual, C024819-001 Rev. A. [[:File:Atari 7800 ProSystem Owner's Manual.pdf]]; source Internet Archive item Atari_7800_Pro_System_Owners_Manual_1987_Atari_US_Rev_A.</ref>
<ref name="ia">Internet Archive, collection atari7800manuals: items GCC1702B_Maria_Chip_Specification_1984_U, 7800_Software_Guide_1987_U, 7800_Trakball_Schematics_1983_U and 7800_Keyboard_Scheme_1984_U. [https://archive.org/details/atari7800manuals archive.org/details/atari7800manuals].</ref>
<ref name="aa265966">"7800 Repair manual...", AtariAge Forums, Atari 7800, thread started by DavidMil. [https://forums.atariage.com/topic/265966-7800-repair-manual/ forums.atariage.com]. Community statement.</ref>
</references>

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[[Category:Atari Service Manuals]]
[[Category:Service Manuals]]