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MICROPAQ 452 REV. B

MONOLITHIC SYSTEMS, INC. (COLORADO MSI)

MICROPAQ 452 REV. B

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

26-pin parallel port (LPT1/2/3) - internal

J3

10-pin serial port 1 (COM1/2/3/4) - internal

J4

10-pin serial port 2 (COM1/2/3/4) - internal

J5

4-pin connector - Drive active LED

J6

28-pin VESA(VGA) feature connector - internal

J7

26-pin VESA(EGA) feature connector - internal

J11

15-pin analog VGA port - external

J13

9-pin digital EGA port- external

J21

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Pin 34 on IDE interface grounded

J10

closed

 

Pin 34 on IDE interface not grounded

J10

open

Floppy drive precompensation is 125ns

J12

open

 

Floppy drive precompensation is 187ns

J12

closed

Hard drive enabled

J14

closed

 

Hard drive disabled

J14

open

On-board video enabled

J15

closed

 

On-board video disabled

J15

open

Floppy drive Interrupt IRQ6 enabled

J16

closed

 

Floppy drive Interrupt IRQ6 disabled

J16

open

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Single speed floppy drives supported

J17

open

 

Dual speed floppy drives supported

J17

closed

16-bit video bus enabled

J18

open

 

8-bit video bus enabled

J18

closed

Floppy drive change signal sense enabled

J19

closed

 

Floppy drive change signal sense disabled

J19

open

VGA clock enabled (normal operation)

J22

pins 1 & 2 closed

 

Feature connector clock enabled

J22

pins 2 & 3 closed

Hard drive Interrupt IRQ14 enabled

J24

closed

 

Hard drive Interrupt IRQ14 disabled

J24

open

IDE IOCHRDY PIN SELECTION

Function

J8

J9

IDE IOCHRDY from IDE pin 21 enabled

off

on

 

IDE IOCHRDY from IDE pin 27 enabled

on

off

 

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.

SERIAL PORT 1 CONFIGURATION

COM

S1/switch 1

S1/switch 2

S1/switch 3

S1/switch 4

1

on

off

off

off

 

2

off

on

off

off

 

3

off

off

on

off

 

4

off

off

off

on

 

Disabled

off

off

off

off

SERIAL PORT 1 (J4) INTERRUPT REQUEST

IRQ

S1/switch 5

S1/switch 6

3

on

off

 

4

off

on

 

Disabled

off

off

PARALLEL PORT (J3) CONFIGURATION - S2

LPT

S2/switch 1

S2/switch 2

S2/switch 3

1

on

off

off

 

2

off

on

off

 

3

off

off

on

 

Disabled

off

off

off

PARALLEL PORT (J3) INTERRUPT REQUEST

IRQ

S2/switch 5

S2/switch 6

7

off

on

 

5

on

off

 

Disabled

off

off

SERIAL PORT 2 CONFIGURATION

COM

S3/switch 1

S3/switch 2

S3/switch 3

S3/switch 4

1

on

off

off

off

 

2

off

on

off

off

 

3

off

off

on

off

 

4

off

off

off

on

 

Disabled

off

off

off

off

SERIAL PORT 2 (J5) INTERRUPT REQUEST

IRQ

S3/switch 5

S3/switch 6

4

off

on

 

3

on

off

 

Disabled

off

off

VIDEO DISPLAY CONFIGURATION

Primary Adapter

Secondary Adapter

JP20

S4/1

S4/2

S4/3

S4/4

 

*Monochrome

EGA w/CGA 40 x 25

1 & 2

on

on

on

on

 

*Monochrome

EGA w/CGA 80 x 25

1 & 2

off

on

on

on

 

*Monochrome

EGA w/EGA 200 line

1 & 2

on

off

on

on

 

*Monochrome

EGA w/EGA 350 line

1 & 2

off

off

on

on

 

*CGA 40 x 25

EGA w/monochrome

2 & 3

on

on

off

on

 

*CGA 80 x 25

EGA w/monochrome

2 & 3

off

on

off

on

 

EGA w/CGA 40 x 25

*Monochrome or none

1 & 2

on

off

off

on

 

EGA w/CGA 80 x 25

*Monochrome or none

1 & 2

off

off

off

on

 

EGA w/EGA 200 line

*Monochrome or none

1 & 2

on

on

on

off

EGA w/EGA 350 line

*Monochrome or none

1 & 2

off

on

on

off

 

EGA w/monochrome

*CGA 40 x 25 or none

2 & 3

on

off

on

off

 

EGA w/monochrome

*CGA 80 x 25 or none

2 & 3

off

off

on

off

 

VGA enable (all other modes disabled)

S4/switch 5 on

 

All other modes enable (VGA mode disabled)

S4/switch 5 off

 

For JP20 pins designated should be in a closed position.

When VGA mode is enabled, the settings of JP20 and S4/switch 1 - 4 are ignored.

The options with a (*) in front of them require an add-on card to function.

MISCELLANEOUS TECHNICAL NOTES

The function of S2/switch 4 is undocumented.

All other jumpers are for factory tests and should remain factory-configured.