BRUMBY DIP Switch Settings 

The BRUMBY board has one eight position dip switch (SW1) which sets the dual
port RAM buffer and I/O addresses. The RAM address is selectable on 16KB
boundaries in the address range 0C0000 - 0DFFFF. The I/O address is
selectable on 16 byte boundaries (ie. the last digit must always be a
zero) in the address range 0300 - 03FF. The defaults for the first board
(DC000 and 360) are highlighted in the following two tables. 

Figure B.1 : Switch 1 (SW1) RAM Address 

           DIP Switch #           I/O       RAM
 1   2   3   4   5   6   7   8  Address   Address
                OFF OFF OFF OFF           DC000+ 
                OFF OFF  ON OFF           D8000
                OFF  ON OFF OFF           D4000
Reserved for    OFF  ON  ON OFF           D0000
I/O address      ON OFF OFF OFF           CC000
                 ON OFF  ON OFF           C8000
                 ON  ON OFF OFF           C4000
                 ON  ON  ON OFF           C0000

+ default
Switch 8 of SW1 should always be OFF 

Figure B.2 : Switch 1 (SW1) I/O Address 

        DIP Switch #              I/O      RAM
 1   2   3   4   5   6   7   8  Address  Address
OFF OFF OFF OFF                   3F0
OFF OFF OFF  ON                   3E0
OFF OFF  ON OFF                   3D0
OFF OFF  ON  ON    Reserved for   3C0
OFF  ON OFF OFF   memory address  3B0
OFF  ON OFF  ON                   3A0
OFF  ON  ON OFF                   390
OFF  ON  ON  ON                   380
 ON OFF OFF OFF                   370
 ON OFF OFF  ON                   360+ 
 ON OFF  ON OFF                   350
 ON OFF  ON  ON                   340
 ON  ON OFF OFF                   330
 ON  ON OFF  ON                   320
 ON  ON  ON OFF                   310
 ON  ON  ON  ON                   300

+ default

BRUMBY JUMPER SETTINGS 

The BRUMBY can be configured to interrupt the PC AT on any one of eight
interrupt lines. To select the interrupt line (IRQ) it is necessary to
install a shorting
connector on the appropriate jumper block. On the BRUMBY-8 and BRUMBY-16
the jumper block is labelled J3. On the BRUMBY-4 the jumper is J4. The
default
IRQ is 15 (ie. position 1).The jumper shown in Figure B.3 is in the default
position
(IRQ 15). 

Figure B.3 : Interrupt Jumper Block 

Interrupt
Jumper    1   2   3   4   5   6   7   8
Position  *
          *
IRQ      15  12  11  10   7   5   4   3




ONBOARD DIP SWITCH SETTINGS

The I/O register DIP switch is at the bottom of the card. This is the only
switch that may need to change before installation. The memory address and
interrupt line (IRQ) are set-up automatically by the software. The address
of the ONboard's I/O register can be set by selecting one of the dip switch
arrangements listed in the following table. 

Figure B.4 : Valid Dip Switch Settings 

      Dip Switch # 
 1    2    3    4    I/O Addr 

 ON   ON   ON   ON      200
 ON   ON   ON  OFF      210
 ON   ON  OFF   ON      220
 ON   ON  OFF  OFF      230
 ON  OFF   ON   ON      240+ 
 ON  OFF   ON  OFF      250
 ON  OFF  OFF   ON      260
 ON  OFF  OFF  OFF      270
OFF   ON   ON   ON      280
OFF   ON   ON  OFF      290
OFF   ON  OFF   ON      2A0
OFF   ON  OFF  OFF      2B0
OFF  OFF   ON   ON      2C0
OFF  OFF   ON  OFF      2D0
OFF  OFF  OFF   ON      2E0
OFF  OFF  OFF  OFF      2F0

+ default 


ONBOARD JUMPER SETTINGS 

16-bit operation (J2)
To ensure data transfers between the system and the ONboard ISA are
16 bits wide, jumper J2 should be installed and the card should reside
in a 16 bit slot.  This ensures that the host system can copy data to
the card more efficiently and improves performance by up to 10%. If the
card is in 8 bit mode (i.e. J2 removed), it will operate in either an 8
or 16 bit slot depending on the memory address entered by the user
during the software installation. 

Advanced I/O Channel Timing (J3) 
The ONboard (ISA) will also operate in PC AT systems that do not adhere to
original IBM PC AT I/O Channel timing. By installing jumper J3 the
ONboard (ISA) will respond to memory requests much earlier than the
standard bus timing. This is necessary in systems that operate the I/O
channel bus at greater than 8 MHz. It is imperative that the jumper J3
is never installed in IBM RT systems. Most 80386 systems should have J2
and J3 installed if 16 bit operation is required. In the default
configuration J2 and J3 are removed. Advanced bus timing is not necessary
for 8 bit operation. 



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