Installing MC/Xi Boards 
Before you plug in the board... 
Write down the serial number of the processor board in the space provided.
You will need it if you have to contact DigiBoard regarding the board. 
Also, be sure to have on hand the DigiBoard ADF (Adapter Description Files) 
diskette, and a working copy of your IBM Reference Diskette (don't use the 
original_it should be write protected and stored in a safe place). 
MC/Xi boards have one jumper which needs to be set by the user, and two 
factory preset jumpers which should not be changed. 

Figure 9	MC/Xi Processor Board and 4-Port I/O Mate 
 __
|  \---------------------------------------------------
|  |              J5 jumper -> xx  xx <- J6 Jumper     |
|  |                                                   |
|  |               part#  serial #        J1 jumper    |
|  |               |      |               |       
|  |               v      v               v            DB-78 <-- Connector 
|  |               xxx    xxx             xx
|__|___________________________        ___           __| 
                              |________| |___________| | <-- Fork
 
IMPORTANT!  This manual is for MC/Xi boards with part number 30001224.  
This number can be found next to the serial number of the Processor board.  
The diagram above points out the location of the part number. 


Jumper Settings 
J1_Dual Ported Memory Window Size 
There is only one jumper on the MC/Xi board that needs to be set by the user.  
This is J1, located above the edge connector on the processor board (see Figure 
9 on page 20).  Jumper J1 determines whether the MC/Xi board's dual-ported 
memory window size will be 32K or 128K. 

In most cases, if the board is to be installed in a machine that runs DOS (MS-
DOS or IBM DOS), systems with 16 megabytes or more of RAM, or systems with 
a memory cache, the 32K window is recommended (this is the factory default 
setting for the jumper). This permits the board to be installed with its memory 
window mapped into a 32K byte range between 0C0000h and 0DFFFFh (below 
the 1 megabyte boundary).

Installing the MC/Xi board below 1 megabyte protects it from interference from 
the cache controllers on some Micro Channel machines, and enables the board to 
be installed in systems with 16 megabytes of memory. 
If your system has 12 megabytes or less of RAM, and the cache controller (if 
present) can be disabled in the 13th through 16th megabyte, you can use the 
128K setting, thus freeing 32K of the 0C0000h-0DFFFFh address space for other 
expansion boards which may not be addressable above 1 megabyte. 

J1 consists of three pins and a jumper block which can connect either the first 
and second pins, or the second and third pins.  With the board oriented so that 
the component side is up and the edge connector is toward you, connecting the 
leftmost and center pins sets the board for a 128K memory window.  Connecting 
the rightmost and center pins makes it a 32K window.  See Figure 10, below. 

Figure 10	MC/Xi Dual-Ported Memory Window Size_Jumper J1 
  
                     O J J             J J O    
                     32k (pins 2&3)    128k (pins 1&2)

Other Jumpers 
The MC/Xi I/O Mates have two jumpers, located near the EPROMs, which 
identify the size of the EPROMs on the board. These jumpers are set at the 
factory, and should only be changed if you are installing custom EPROMs.  On 
RS-232 versions of the MC/Xi, the jumpers are labeled J5 and J6.  On RS-422 and 
RS-422/RS-485 versions, they are J3 and J4. 

Table 2	MC/Xi EPROM Size Jumpers (RS-232) 
EPROM Size   J5 Pins   J6 Pins

*16K          1 & 2     1 & 2
 32K          1 & 2     1 & 2
 64K          1 & 2     2 & 3
128K          2 & 3     2 & 3
 
Table 3	MC/Xi EPROM Size Jumpers (RS-422, RS-422/RS-485) 
EPROM Size   J5 Pins   J6 Pins

*16K          1 & 2     1 & 2
 32K          1 & 2     1 & 2
 64K          1 & 2     2 & 3
128K          2 & 3     2 & 3
 
* The default EPROM size is 16K. 

Board Installation - MC/16i 
1.  Place the connector box assembly near the open slot at the rear of the 
machine. Thread the two gray ribbon cables through the slot so that the two 
plugs are pointing toward the bus connector into which you intend to plug 
the board. 
2  Carefully thread both cables through the opening in the MC/16i board's 
endplate so that the shorter of the two cables (marked "P3") is closest to the 
board and the connectors are pointing toward the board. 
3.  Plug the cable end marked "P3" (the shorter cable) into the board connector 
"P6". Plug the cable end marked "P2" (the longer cable) into the board 
connector "P5" (see Figure 12, below, for the location of P5 and P6). 

Figure 12	MC/16i Board 
  
 __
|  \---------------------------------------------------
|  |                                                   |
|  |                                            P5  P6 |
|  |                                             x  x  |
|  |                                             x  x  |  
|  |                                             x  x  | 
|  |                                             x  x  | 
|__|___________________________        ___           __| 
                              |________| |___________| | <-- Fork
 
4.  Carefully move the MC/16i board and cables into position in the computer.  
Plug the board into the Micro Channel slot, making sure that the "fork" is in 
position under the endplate thumbscrew.  Tighten the thumbscrew. 
5.  Replace your computer's cover, and proceed to Configuring the MC/Xi 
Board, beginning on the following page. 


Configuring the MC/Xi Board 
After the MC/Xi board has been physically installed in your machine, you need 
to configure the board for operation in your system. This is done by running
the configuration program on the IBM Reference Diskette. 

1.  Insert your working copy of the IBM Reference Diskette into your boot 
drive (Drive A) and turn on the computer's power. Expect an error 
message_the MC/Xi board won't be found in the configuration file at this 
point. 
2.  Select "Copy an Option Diskette" from the main menu. Follow the 
instructions given on your computer screen for copying ADF files onto your 
Reference Diskette. 
3.  Select "Set Configuration" from the main menu. Then select "Run 
Automatic Configuration" from the Set Configuration menu. Auto-Config 
will find non-conflicting address and interrupt parameters for the board for 
you. If you choose to set the parameters manually, you will be given the 
following choices: 

Memory Start Address (32K Setting): 0C0000h, 0C8000h, 0D0000h or 0D8000h 

Memory Start Address (128K Setting): FC0000h, FA0000h, F80000h or 0C0000h 


I/O Port Address: F1F0h, F2F0h, F4F0h or F8F0h 

Interrupt Select: IRQ 3, 4, 5, 6, 7, 9, 10 or 11 

4.  Remove the Reference Diskette from the drive and reboot your machine.  
This time you should get no error message. 
 
ADF Files 
Different Adapter Description Files are necessary for the MC/Xi, depending 
upon the individual configuration of the board (number of ports, memory size 
and interface type).  These files are supplied on a diskette shipped with the 
MC/Xi board. 

The ADF diskette contains the following files: 
@6FE9.ADF	4 & 8 port boards, RS-232 interface, 128K memory. 
@7F99.ADF	4 & 8 port boards, RS-232 interface, 32K memory. 
@6FEB.ADF	16 port boards, RS-232 interface, 128K memory. 
@7F9B.ADF	16 port boards, RS-232 interface, 32K memory. 
@6FEA.ADF	4 & 8 port boards, RS-422 interface, 128K memory. 
@7F9A.ADF	4 & 8 port boards, RS-422 interface, 32K memory. 

Note_The above list is provided as a point of interest only.  The "Copy an 
Option Diskette" function will copy all of the above files, and the 
configuration program will automatically choose the correct file for your 
board configuration.