Specifications

CHAPTER 3
I/O Specifications
DB26 Connector 45
DB26 Connector 3
The DB26 connector allows you to connect a monitor to the PC system. It is used with
CPUs that do not have a GIMO connector and therefore do not support the Berlin
adapter card. The DB26 connector provides a loop-back connection to the video output
connector on the CPU main logic board. The loop back is implemented by a split video
cable that also provides a connector for an external monitor. If the CPU does have a
Berlin adapter card and GIMO connector, you can use the DB26 connector to hook up a
second monitor.
Figure 3-1 on page 34 and Figure 3-2 on page 35 show the location of this connector on
the 12" and 7" cards, respectively. “Loop-Back Video Support” on page 30 provides more
information about this type of interface.
Table 3-4 lists the pin assignments and signal descriptions for the DB26 connector.
Table 3-4 DB26 connector pin assignments
Pin number Signal Description
1 MAC HSYNC Macintosh horizontal synchronize
2, 4, 6, 8 GND Logic ground
3 MAC BLUE Macintosh blue signal
5 SENSE0 Sense line 0
7 BLUE OUT Blue output from PCI card
9 HSYNC OUT Horizontal synchronize output from PCI card
10 MAC CSYNC Macintosh contrast synchronize
11, 13, 15,
17, 21, 24
GND Chassis ground
12 MAC GREEN Macintosh green signal
14 SENSE1 Sense line 1
16 GREEN OUT Green output from PCI card
18 CSYNC OUT Contrast synchronize output from PCI card
19 MAC VSYNC Macintosh vertical synchronize
20 MAC RED Macintosh red signal
22 CABLE DET L Cable detect low
23 SENSE2 Sense line 2
25 RED OUT Red output from PCI card
26 VSYNC OUT Vertical synchronize output from PCI card