Zenith Z-100 Reference Manual page 106

Table?.6. (continued) Video Card to System Interface Signals
SIGNAL
NAME
DESCRIPTION
Enables the internal VO buffers and docks data into and out of
the internal registers via the data buffers.
In your computer, the E input connects to the system ECLK signal.
Synchronizes the 6845's control signals.
Derived from the system dock to become the character rate dock
in text mode.
Primary timing unit to the 6845.
Initializes the 6845.
When this pin goes low, the internal counters are deared and
the 6845 outputs go low, effectively stopping the video display
operation.
As the RESET* signal does not affect the program accessible coun-
ters within the 6845, display may continue when RESET' goes
high.
Vcc (+ SV)
Standard TfL power levels which enable proper and opemtion
and Vss
of the video card ICs.
(Ground)
Video Graphics Programming
page 7.17