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MICROPAQ 451

MONOLITHIC SYSTEMS, INC. (COLORADO MSI)

MICROPAQ 451

Data bus:

16-bit, ISA

Size:

Full-length, full-height card

Hard drive supported:

Two IDE (AT) Interface drives

Floppy drives supported:

Two 360KB, 720KB, 1.2MB, or 1.44MB drives

CONNECTIONS

Function

Location

40-pin IDE(AT) Interface connector

J1

34-pin control cable connector - floppy drive

J2

10-pin serial port (COM1/3) - internal

J3

10-pin serial port (COM2/4) - internal

J4

4-pin connector - Drive active LED

J5

15-pin VGA port - external

J6

25-pin parallel port (LPT1/2/3) - external

J8

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Floppy drive enabled

S1/switch 1

on

 

Floppy drive disabled

S1/switch 1

off

Floppy drive change signal sense enabled

S1/switch 2

on

 

Floppy drive change signal sense disabled

S1/switch 2

off

Single speed floppy drives supported

S1/switch 3

off

 

Dual speed floppy drives supported

S1/switch 3

on

Floppy drive precompensation is 125ns

S1/switch 4

off

 

Floppy drive precompensation is 187ns

S1/switch 4

on

VGA port enabled

S2/switch 1

on

 

VGA port disabled

S2/switch 1

off

16-bit video bus enabled

S2/switch 2

off

 

8-bit video bus enabled

S2/switch 2

on

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Hard drive enabled

S2/switch 4

on

 

Hard drive disabled

S2/switch 4

off

Pin 34 on IDE interface not grounded

S2/switch 7

on

 

Pin 34 on IDE interface grounded

S2/switch 7

off

SERIAL PORT 1 (J3) CONFIGURATION - S3

Function

Switch 1

Switch 2

Switch 3

Switch 4

COM1, IRQ4

on

off

off

on

COM1, IRQ3

on

off

on

off

COM3, IRQ4

off

on

off

on

COM3, IRQ3

off

on

on

off

Disabled

off

off

off

off

SERIAL PORT 2 (J4) CONFIGURATION - S3

Function

Switch 5

Switch 6

Switch 7

Switch 8

COM2, IRQ4

on

off

off

on

COM2, IRQ3

on

off

on

off

COM4, IRQ4

off

on

off

on

COM4, IRQ3

off

on

on

off

Disabled

off

off

off

off

PARALLEL PORT (J8) CONFIGURATION - S4

LPT

Switch 1

Switch 2

Switch 3

LPT1

off

off

off

 

LPT2

off

off

on

 

LPT3

off

on

off

 

Disabled

off

on

on

PARALLEL PORT (J8) INTERRUPT REQUEST - S4

IRQ

Switch 5

Switch 6

IRQ7

off

on

 

IRQ5

on

off

 

Disabled

off

off

IDE IOCHRDY PIN SELECTION

Function

S2/switch 5

S2/switch 6

IDE IOCHRDY from IDE pin 21 enabled

on

off

 

IDE IOCHRDY from IDE pin 27 enabled

off

on

 

Pin 21 setting is for Seagate, CDC, Imprimis, and Miniscribe hard drives. Pin 27 setting is for Quantum hard drives. Conner and WD hard drives ignore the setting of these switches.

MISCELLANEOUS TECHNICAL NOTES

All other switches and jumpers are factory configured - do not alter.