A. Jumper Descriptions
46
W11-W14 (Interrupt Signal Selection)
These jumpers provide additional interrupt control. When a
software configuration utility
is used to select IR15, the interrupt is routed to these four jumpers. Installing one of the
four jumpers determines where IR15 is routed. The factory default leaves these jumpers
uninstalled.
Jumper
IR15 Routing
W11
Backplane interrupt NMIRQ*
W12
Backplane interrupt INTRQ3*
W13
Frontplane interrupt FP6 (pin 8 of J1)
W14
Frontplane interrupt FP1 (pin 2 of J1)
W15 (Early ALE* Signal Generation)
W15 controls how ALE is generated for the AT/LANTIC chip. Installing W15 allows an
early ALE signal to get addresses on-board to the AT/LANTIC chip. Removing W15
allows normal address generation. Most systems operate equally well with W15 in either
position. However, if you experience difficulties or random access problems, install
W15. When the board is operated in shared memory mode, see also the jumper
description for
W8 and W9
.
W15
Function
†
In
Early, on-board ALE generated
Out
Normal address generation
†
Factory default configuration
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