
CFN III Quick Reference
Page 20 MDE-4483 CFN III Quick Reference Guide v3.3 · August 2005
Jumpers
SC-Comm CPU Board settings
Jumper Description Setting
K3 AC power fail sense
2-3 to enable
1-2-3 to disable*
K4 AC watch dog timer 1-2 to enable*
K5
SC-Comm CPU (testing
only)
1-2 to reset
K6
RS-485 loop 1, 2 wire to 4
wire
2-3 for 4 wire*
1-2 for 2 wire
K7
RS-485 loop 2, 2 wire to 4
wire
2-3 for 4 wire
1-2 for 2 wire*
K8
Rx Clock from synchronous
modem (DB-25-15)
1-2 to connect
K9
ETC output to synchronous
modem (DB-25-24)
1-2 to connect
K10
Tx clock input from
synchronous modem (DB-
25-17)
1-2 to connect
K11 EPROM type
2-3 for 27256 or
27128
K12 EPROM type
2-3 for 27256 or
27128
* = default setting
CFN3 Memory Board
Assembly part number: C05839.
Switches
DIP Switch SC-Memory I/O-S1
Position & Definition Setting
1 Boot to monitor after reset
Boot to OS after reset
open
closed
2 Debug mode
Normal
open
closed
3 Don’t talk to PC while in
monitor
Monitor I/O goes to PC also
open
closed
4 Monitor I/O goes to SC port 1
also
No monitor I/O to SC port 1
open
closed
Dip Switch SC -Memory I/O-S2
Position & Definition Setting
1 Battery 1 open=disabled
closed=enabled*
2 Battery 2 - External open=disabled*
closed=enabled
3 N/A unused
4 N/A unused
Jumpers
SC-Comm Memory I/O board settings
Jumper Description Setting
K1 Date/Time Clock Speed *1-2 for 4 wait
state
2-3 for 1 wait
state
K2 Enable A19 to RAM *2-3 for 128Kx8
1-2 for 512Kx8
K3 RAM size *2-3 for 128Kx8
1-2 for 512Kx8
K4 External Battery no connector =
disabled
K5 Tokheim Reset Output
Channel 2
Do not install; not
supported
1-2 for reset
* = default
CFN3 Memory Map
00000
- RAM
FFFFF
00000 DUAL RAM
00000 EEPROM
00000 SCC0
00800 SCC1
01700 SCC2
10000 SCSI
10100 LEDs
10200 CPU Board Switches
20000 Real Time Clock
20100 Memory Board
Switches
20300 Battery Status
20500 Watchdog Reset
20700 Battery Drain Control
00900
- EPROM
Fffff
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