CDR-3100 (250-1098)       Adapter Board Layout         Faxback Doc. # 2597

┌─────────────────────────────────────────────┐
│                                      ┌────┐ │
│                                      │ P3 │ │
│                             P2       └────┘ │
│                         ┌┬┬┬┬┬┬┬┬┐          │
│                         └┴┴┴┴┴┴┴┴┘          │
│                                             │
│Bus         IRQ Mode Selection─┐             │
│Address                        │             │
│Selection ──┐                  │          ┌──┤
│            │       TP  OC     │          │  ├┐
│    A   B   │       o o o <────┘          │  ││  <- Connector
│ W2 ° ° ° <─┘     o o o o <───IRQ         │  ││
│ W3 ° ° °         o o o o     Selection   │  ├┘
│    C   D       W 6 7 8 9          ┌──┐   └──┤
└─────┬┬┬┬┬┬┬┬┬┬┬─────────┬┬┬┬┬┬┬┬┬┬┤  └──────┘
      └┴┴┴┴┴┴┴┴┴┴─────────┴┴┴┴┴┴┴┴┴┴┘       

SETTING THE PORT (BUS) ADDRESS

The CD-ROM drive's adapter interface card port address is the memory 
location where the computer looks for the drive.  In most cases, the 
factory set port address (340h) works.  However, if there is another
device in your computer that uses that port address, such as a network
board, you must change the CD-ROM drive's port address to prevent a 
conflict.

If you select a different port address, the CD-ROM software must be told
what the new port address is.  There are four possible port address 
settings.

JUMPER SETTINGS

Set the jumpers for the port address are as follows:

Port Address 300h     Jumper from A to the upper middle pin and;
                      Jumper from C to the lower middle pin.

Port Address 310h     Jumper from the upper middle pin to B and;
                      Jumper from C to the lower middle pin.

Port Address 330h     Jumper from A to the upper middle pin and;
                      Jumper from the lower middle pin to D

Port Address 340h     Jumper from the upper middle pin to B and;
   (Default)          Jumper form the lower middle pin to D.

SETTING THE IRQ CHANNEL

Your computer performs many tasks while you use it.  Interrupt Request
Channels (IRQs) prioritize the many jobs, or interrupts, your computer
must handle.

The IRQ Mode Selection Jumper is set by the factory and should be left
as is.

The adapter interface card Interrupt Line Selection (IRQ), found on the
adapter interface card above the edge connector, is preset to IRQ3.
(Having more that one serial port will affect the IRQ3 setting.  Disable
the second serial port and see your computer User's Guide to determine if
the IRQ channel needs to be changed.)

(/tmc-09/29/95)