File:Atari 130XE FREDDIE, MMU, DRAM and oscillator (C070065 schematic).png

Detail of Atari's 130XE schematic: the MMU U3, FREDDIE U6 (RAS, CAS and write strobes and the multiplexed RAM address lines RA0-RA7, clock input CLK on pin 2, OSC on pin 37), the main DRAM U9-U16 and extended DRAM U26-U33, the extended-memory gate array U34 with its CASMAN and CASBANK outputs through R110 and R111, and the 14.31818 MHz oscillator: the crystal Y1 with Q4 and Q5, or the alternative oscillator module.

Rendered from File:Atari 130XE Parts List and Production Test Instructions.pdf (Atari's 130XE Reference Manual), PDF page 14, the schematic diagram C070065 Rev. B drawn by Atari (Japan) Corporation in 1985, at the scan's 300 dpi, and cropped.

Atari (Japan) Corporation for Atari Corp.

Copyright Atari Corp. Hosted for preservation and repair reference, with the source cited.