DIGITAL-LOGIC AG

MSEBX800/900 Detailed Manual V1.0

5.3.Controllers

5.3.1.Interrupt Controllers

An 8259A compatible interrupt controller, within the chipset, provides seven prioritized interrupt levels. Of these, several are normally associated with the board's onboard device interfaces and controllers, and several are available on the AT expansion bus.

Interrupt

Sources

Used Onboard

IRQ0

ROM-BIOS clock tick function, from timer 0

Yes

IRQ1

Keyboard controller output buffer full

Yes

IRQ2

Used for cascade 2. 8259

Yes

IRQ3

COM2 serial port

Yes

IRQ4

COM1 serial port

Yes

IRQ5

LPT2 parallel printer (if present)

No ￿

IRQ6

Floppy controller

Yes

IRQ7

LPT1 parallel printer

Yes

IRQ8

Battery backed clock

Yes

IRQ9

Free for user

No ￿

IRQ10

Free for user

No ￿

IRQ11

Free for user

No ￿

IRQ12

PS/2 mouse

Yes

IRQ13

Math. coprocessor

Yes

IRQ14

Hard disk IDE / SCSI

Yes

IRQ15

Free for user

No ￿￿

￿It may depend on the LAN configuration.

￿￿IRQ 15 = if option CF is not assembled, then free for user.

5.3.2.Timers and Counters

5.3.2.1.Programmable Timers

An 8253 compatible timer/counter device is also included in the board's ASIC device. This device is utilized in precisely the same manner as in a standard AT implementation. Each channel of the 8253 is driven by a 1.190MHz clock, derived from a 14.318MHz oscillator, which can be internally divided in order to provide a variety of frequencies.

Timer 2 can also be used as a general purpose timer if the speaker function is not required.

Timer Assignment

Timer

Function

0

1

2

ROM-BIOS clock tick (18.2Hz) DRAM refresh request timing (15µs) Speaker tone generation time base

5.3.2.2.Watchdog

The watchdog timer detects a system crash and performs a hardware reset. After power up, the watchdog is always disabled as the BIOS does not send strobes to the watchdog. In case the user wants to take advantage of the watchdog, the application must produce a strobe at least every 800ms. If no strobe occurs within the 800ms, the watchdog resets the system.

5.3.3.Core BIOS Download

See the separate driver/software/BIOS manual, GEODE_LX800-900.

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Compaq MSEBX900, MSEBX800 user manual Controllers, Interrupt Sources Used Onboard, Timer Assignment Function

MSEBX900, MSEBX800 specifications

The Compaq MSEBX800 and MSEBX900 are notable entries in the realm of business computing, designed specifically to meet the needs of enterprise environments. These models epitomize reliability, performance, and advanced technology, making them suitable for a variety of applications in both small offices and large enterprises.

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