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J17: (ROM size)
This three-pin jumper permits the installation of different size
ROMS. When placed in position 1, ROMs up to/including 1 megabits (128K
bytes) may be installed. When placed in position 2, ROM sizes 1 megabits and
above can be installed. Default: 1 megabit and above (position 2).
J18: (IRQ input)
Allows for bringing an external signal from the AUX port to
the IRQ input of the processor. This is not a user configurable line, so this jumper
should not be disturbed from its default position. Default: Position 1.
J19: (decoding select)
This jumper determines the source of the received data
sent to the processor for decoding. In its normal position (position 1), data sent to
the processor is the filtered and demodulated input signal tones. To receive digi-
tal data from an extenal modem (or other external data source), place J19 in
position 2 to bypass the local, on-board demodulator. Default: position 1.
J20: (watchdog)
This jumper enables/disables the watchdog timer for the mo-
dem. When not connected, the watchdog timer is active; when connected, the
timer is disabled. Default: not connected (OFF).
J21: (signal A/D input select)
This jumper allows for bringing the
Filtered/AGCed signal to an A/D input of the processor. This option is for future
development and is not currently used. Default: position 1.
J22: (undemodulated signal select)
This jumper selects whether the received
data from the local on-board modem is demodulated or just AGCed and Filtered
before being sent to the processor. Normal operations requires demodulated
receive data. The other option is provided for future development.
Default: position 1.
J23: (RAM size)
This three pin jumper allows the installation of various size
static RAMs. When placed in position 1, the unit can accept up to/including a
128K static RAM. When placed in position 2, the unit accepts a 512K static
RAM. Default: position 1.
J24: (RAM voltage)
If the clock chip is not installed, this jumper must be in-
stalled to provide an enable signal to the RAM chip. Default: OFF.
J25: (chip enable)
If the clock chip is not installed, this jumper must be in-
stalled to provide the chip enable signals. Default: OFF.
Appendix B: Advanced Information
KAM’98 Jumpers
User’s Guide
344
KAM’98 v 8.3
Содержание KAM 98
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