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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
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 × 25 1 & 2 on on on on
*Monochrome EGA w/CGA 80 × 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 × 25 EGA w/monochrome 2 & 3 on on off on
*CGA 80 × 25 EGA w/monochrome 2 & 3 off on off on
     EGA w/CGA 40 × 25 *Monochrome or none 1 & 2 on off off on
     EGA w/CGA 80 × 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 × 25 or none 2 & 3 on off on off
     EGA w/monochrome *CGA 80 × 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.

 
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