As shown in Figure 9-1, the main microprocessor accesses read-
only and read-write memory, and controls the keyboard, LCD
display, and clock. The slave microprocessor controls the micro-
printer, speaker, and external cassette. The cartridge interface has
ports for both the main and slave microprocessors.
Figure
9-1
HX-20 Architecture
ROM
I
I
SOCKET
8KB
6301
MAIN CPU
BARCODE READER
INTERFACE
CARTRIDGE
INTERFACE
-El
6301
SLAVE CPU
CASSETTE TAPE
INTERFACE
POWER
SUPPLY
66
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