THEORY OF OPERATATION
4.2 DETAILED LOGIC DESCRIPTION
This description will be referenced only to the sheet numbers that are contained within the Title
Block of each individual shcematic. Before proceeding, the reader should be familiar with
paragraph 4.0, LOGIC DESCRIPTION AND USE.
It is also important to keep in mind that while the simplified block diagrams presented are
conceptually accurate, the functions are performed by a mixture of hardware and firmware. A
functional block diagram of the TM7000 TymMachine may be found in Figure 4.2.1.
The TymMachine is a Microprocessor based system. The Microprocessor used, a 65C02, has an
eight bit data bus and a non-multiplexed 16 bit address bus. The processor in the GENERATOR
assembly is used as a system controller for handling internal and external (Optional) I/O as well
as the user interfaces: Time Display, LCD Display and Keyboard.
Most hardware logic functions are provided by U23 [15] a PLD which is programmed by U25
[4] at power up.
Symmetricom, Inc. TM7000 TymMachine TCG/T (Rev D) 4-5
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