Mostek z80 - Control Module Description

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l.6 CONTROL MODULE
The Control module interfaces to the development system bus and has
circuitry for detecting the breakpoint conditions and forcing execution to
begin in the System Interface RAM. Connectors Jl and J2 bring the Address,
Il:lta and Control signals from the Target Z80 CPU in the Buffer module.
Connector J3 brings the hardware breakpoint signal from the History module.
The System
Interface RAM which is loaded with an interface program is
shadowed into the Target memory space. This control program makes the
Target CPU a slave to the development system. When the user desires to
resume execution, the control program activates the execution control
circuit and execution resumes at the desired address. '!he memory control
circuit is used to map the sixteen k byte emulation RAM to appear at any
address in the Target memory space.