SENSATION!  (250-1650)   Jumper/Switch Settings         Faxback Doc. # 1257


Note: Refer to Faxback Doc. # 1267 for Main Logic Board Layout.

Note: If you do not have some understanding of interrupts, don't change the
settings of Jumpers J11 or J21 or Switch SW7.

JUMPER     SETTING         FUNCTION

J11        Installed       Synthesizer interrupt (IRQ15) enabled
           Parked (1)      Synthesizer interrupt disabled
J16        Installed (2)   Monochrome video enabled
           Removed (1)     Color video enabled
J21        Installed (1)   Waveform playback interrupt (IRQ5) enabled
           Removed         Waveform playback interrupt (IRQ5) disabled

(1) Default (factory) jumper settings
(2) Install to connect a monochrome monitor

Switch Settings:

Use the switches on the main logic board to configure your video circuitry
for monitor operation with 800 x 600 and 1024 x 768 resolution video modes.
Your applications and monitor must support the video mode you select.

The switch block on the main logic board contains eight switches:

             ┌─────────────────────────────┐
   Switch    │ O   1  2  3  4  5  6  7  8  │
   Block     │ N  ┌─┐┌─┐┌─┐┌─┐┌─┐┌─┐┌─┐┌─┐ │
   (SW1)     │/│\ │ ││ ││ ││ ││ │├─┤│ │├─┤ │
             │ │  ├─┤├─┤├─┤├─┤├─┤│ │├─┤│ │ │
             │ │  └─┘└─┘└─┘└─┘└─┘└─┘└─┘└─┘ │
             └─────────────────────────────┘

┌──────────────┬───────────────────────────────────────────────────────┐
│ SWITCH       │                                                       │
│ SETTINGS     │ FUNCTION                                              │
├──────────────┼───────────────────────────────────────────────────────┤
│ SW1    SW2   │                                                       │
│              │                                                       │
│ OFF(1) OFF(1)│ 800 x 600 resolution with 16 or 256 colors at 56 Hz   │
│ OFF    ON    │ 800 x 600 resolution with 16 or 256 colors at 60 Hz   │
│ ON     OFF   │ 800 x 600 resolution with 16 or 256 colors at 72 Hz   │
│ ON     ON    │ 800 x 600 resolution with 16 or 256 colors at 56 Hz   │
├──────────────┼───────────────────────────────────────────────────────┤
│ SW3    SW4   │                                                       │
│              │                                                       │
│ OFF(1) OFF(1)│ 1024 x 768 resolution with 16 or 256 colors at 56 Hz, │
│              │ interlaced                                            │
│ OFF    ON    │ 1024 x 768 resolution with 16 or 256 colors at 60 Hz, │
│              │ non-interlaced                                        │
│ ON     OFF   │ Reserved                                              │
│ ON     ON    │ Reserved                                              │
├──────────────┴───────────────────────────────────────────────────────┤
│ (1)-Default switch setting                                           │
└──────────────────────────────────────────────────────────────────────┘
┌────────────────────────────────────────────────────────┐
│ SWITCH   SETTING      FUNCTION                         │
├────────────────────────────────────────────────────────┤
│ SW5      OFF (1,2)    31.5 kHz standard modes (0-13)   │
│          ON  (2)      40 kHz standard modes (0-13)     │
├────────────────────────────────────────────────────────┤
│ SW6      OFF          Not used                         │
│          ON (1)       Not used                         │
├────────────────────────────────────────────────────────┤
│ SW7      OFF (1)      Disable video interrupt on IRQ9  │
│          ON           Enable video interrupt on IRQ9   │
├────────────────────────────────────────────────────────┤
│ SW8      OFF          Disable on-board VGA             │
│          ON (1)       Enable on-board VGA              │
├────────────────────────────────────────────────────────┤
│ (1)-Default switch setting                             │
│ (2)-Refer to Faxback Doc. # 1235 for a listing of the  │
│     Standard video modes                               │
└────────────────────────────────────────────────────────┘

Interrupts:

The connection of devices to the main logic board affects some of the
interrupts used by the system. Disconnecting a device from the main logic
board can free an interrupt for other uses.

┌────────────────────────────────────────────────────────────────┐
│ HARDWARE       INTERRUPT    DEVICE                             │
│ CONTROLLED     STATUS       STATUS                             │
│ INTERRUPT                                                      │
├────────────────────────────────────────────────────────────────┤
│ IRQ3           In use       Modem connected (1)                │
│                Available    Modem disconnected                 │
├────────────────────────────────────────────────────────────────┤
│ IRQ11          In use       CD-ROM drive adapter connected (1) │
│                Available    CD-ROM drive adapter disconnected  │
├────────────────────────────────────────────────────────────────┤
│ IRQ14          In use       SmartDrive connected (1)           │
│                Available    SmartDrive disconnected            │
├────────────────────────────────────────────────────────────────┤
│ (1)-Default hardware configurations                            │
└────────────────────────────────────────────────────────────────┘

Interrupt Assignments:

Some of the settings you choose when you run setup control how system
interrupts are set. The following table lists the interrupts affected by
settings for setup options:

INTERRUPT             SETUP SELECTION

IRQ3   Available      Serial port is primary and modem is not connected
IRQ3   In use         Serial port is secondary
IRQ4   Available      Serial port is secondary or disabled
IRQ4   In use         Serial port is primary (1)
IRQ6   Available      A: and B: options set to NONE
IRQ6   In use         A: and B: options set to anything other than NONE (2)
IRQ7   Available      Parallel port disabled
IRQ7   In use         Parallel port enabled (1)
IRQ12  Available      Mouse option disabled
IRQ12  In use         Mouse option enabled (1)
IRQ14  Available      C: and D: options set to NONE (3)
IRQ14  In use         C: and D: options set to anything other than NONE (1)

(1)--Indicate default setting of the setup option.
(2)--A direct memory access (DMA) channel is affected by the setting of the
     A: and B: options. Selecting NONE for both options frees DMA Channel 2
     for other uses.
(3)--IRQ14 interrupt can also be freed by disconnecting hard drives from the
     main logic board.


(smm/tmc-04/26/95)