DEC VT220 - Page 115

• Input stage gates data gate value with blink, bold,
and blank attribute inputs to provide biasing to
composite video output and video output stages.
• Composite video output stage develops a composite
video output to be used by an optional monitor device
connected to J3 from input stage biasing and composite
sync (C SYNC L) inputs.
• Video output stage develops video output to monitor
circuits from input stage biasing inputs.
• Sync buffers -- buffer sync outputs to monitor circuits.
• Jl -- provides interconnection between logic board and PS
and monitor board.
NOTE
A complete pin-out for Jl is provided in
the system communication logic
description presented in Chapter 5
(Figure 5-9).
Descriptions of the signals shown in Figure 6-27 follow in Table
6-2.
6.3 SIGNAL DESCRIPTIONS
Table 6-2 provides descriptions of all the signal identifed in
this chapter. These descriptions are provided for reference, and
are listed alphabetically by mnemonic, with numeric mnemonics
listed last.
6-31