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.[1]
Schematic Diagram 7800 (C025231-001)
[edit | edit source]Schematic Diagram 7800 is Atari, Inc.'s drawing C025231-001, revision A, a single E-size sheet dated 1984.[2] 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
[edit | edit source]- 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
[edit | edit source]- 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
Download: Atari 7800 Schematic Diagram C025231-001.pdf
7800 repair flowchart
[edit | edit source]A six-sheet flowchart preserved with the 7800 development documents on the Internet Archive. Its author and date are not printed.[3]
- 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
[edit | edit source]- Atari 7800 Troubleshooting Guide
- Atari 7800 General Maintenance
- Atari 7800 Capacitor Replacement Guide
Download: Atari 7800 Repair Flowchart.pdf
Atari 7800 ProSystem owner's manual
[edit | edit source]The owner's manual, Atari part number C024819-001 Rev. A, copyright 1986 Atari Corp., printed in Taiwan in 1987, has 12 PDF pages.[4] 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
[edit | edit source]- Atari 7800: power adaptor
- Atari 7800 General Maintenance: care instructions, pause blanking
- Atari 7800 Troubleshooting Guide: set-up chart
Download: Atari 7800 ProSystem Owner's Manual.pdf
Other 7800 documents
[edit | edit source]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.[5] AtariAge members have shared a 7800 theory-of-operation archive and a parts list compiled by Mitch in the forum thread cited below.[1]
References
[edit | edit source]- ↑ 1.0 1.1 "7800 Repair manual...", AtariAge Forums, Atari 7800, thread started by DavidMil. forums.atariage.com. Community statement.
- ↑ 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.
- ↑ 7800 repair flowchart, six sheets. File:Atari 7800 Repair Flowchart.pdf; source Internet Archive item Repair_Flowchart (collection atari7800manuals).
- ↑ 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.
- ↑ 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. archive.org/details/atari7800manuals.