Zenith Z-100 PC series Service Manual page 245

Page
2.2
Installation
Table 2.1. Interrupt Vector Selection
JUMPER INTERRUPT VECTOR
J307 Interrupt 2
J308 Interrupt 3 (COM2)
J309
Interrupt 4 (COM 1) 1
J310 Interrupt 5
J311 Interrupt 6
J312 Interrupt 7
1. Initial jumper position.
Notes: Normally J308 COM2 (IR03)
or
J309 COM1 (IR04) is jumpered.
Only one jumper is to be installed for J307 through J312.
Table 2.2. Monitor Synchronization and Light Pen Configuration
JUMPER DESCRIPTION JUMPER PINS
J301
Light pen polarity
positive edge 2-3
negative edge
1-21
J302 Ext. monitor vertical sync
composite sync
2-3
pure vertical sync
1-21
J303 Ext. monitor vertical sync polarity
positive
1-21
negative
2-3
J304 Int. monitor vertical sync polarity
positive
1-21
negative
2-3
J305 Ext. monitor horizontal sync polarity
positive 1-21
negative
2-3
J306 Int. monitor horizontal sync polarity
positive
1-21
negative
2-3
1. Initial jumper position.
NOTE: Video Sync signals interface with external connector P306 and internal monitor
connector P303.
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