The RF signal is generated in both the 400 and 800 Power Supplies
from the MOD signal received from the Motherboard. It is routed
through the A203 integrated circuit to develop the RF output (J203).
A peripheral connector jack, J202 for the 400 Console and J204 for
the 800 Console, provides the serial data-in/data-out port for the
system. Devices are ”daisy chained” together from this one output
port. Each peripheral device is identified by a unique address,
enabling all devices to reside on one output port.
Also contained on the 800 Power Supply board is the Monitor connector
jack (J205). Present at J205 is the Composite video signals to drive
a video monitor. The 800 Power Supply board also contains switches
S204 through S207. These switches are the System Reset, Option
Select, Game Select, and Game Start, respectively.
4.3.7 ROM Cartridge
The ATARI ROM Cartridge contains two ROM chips designed to provide a
specific program application. See Figures 4-19 and 4-20. The 6502
microprocessor reads the information contained within the ROM chips
by addressing memory locations BFFF through 8000. When the ROM
Cartridges are inserted in the Motherboard they disable the RAM
Memory address locations 8000 to BFFF, in 8K increments. The "left"
ROM Cartridge overlays memory locations A000 to BFFF, and the "right"
ROM Cartridge overlays locations 8000 to 9FFF.
ATARI Personal Computers 4-17
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