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3.5 Mini-Debugger Jumper (CF6)
The Mini-Debugger jumper is located at J30–21/22 (CF6). The default position for
this jumper is out (Figure 2). The Alpha SROM Mini-Debugger is stored in the
SROM. When this jumper is in, it causes the SROM initialization to trap to the Mini-
Debugger (communication through connector J32) after all initialization is complete,
but before starting the execution of the system flash ROM code.
3.6 Boot Option Jumper (CF7)
The boot option jumper is located at J30–23/24 (CF7). The default position for this
jumper is out (Figure 2). This jumper selects the image to be loaded into memory
from the system flash ROM. With the jumper out, the Windows NT ARC firmware
is loaded. With the jumper in, the fail-safe booter is loaded. For more information
about the fail-safe booter, refer to Section 8.3.
3.7 Flash ROM Update Jumper (J31)
When J31–2/3 are jumpered together (default), the flash ROM is write-enabled.
When J31–1/2 are jumpered together, the flash ROM is write-protected.
10
AlphaPC 164 Jumper Configuration
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