MONOLITHIC SYSTEMS, INC. (COLORADO MSI)
MICROPAQ 451
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Data bus: |
16-bit, ISA |
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Size: |
Full-length, full-height card |
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Hard drive supported: |
Two IDE (AT) Interface drives |
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Floppy drives supported: |
Two 360KB, 720KB, 1.2MB, or 1.44MB drives |
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CONNECTIONS | |
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Function |
Location |
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40-pin IDE(AT) Interface connector |
J1 |
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34-pin control cable connector - floppy drive |
J2 |
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10-pin serial port (COM1/3) - internal |
J3 |
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10-pin serial port (COM2/4) - internal |
J4 |
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4-pin connector - Drive active LED |
J5 |
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15-pin VGA port - external |
J6 |
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25-pin parallel port (LPT1/2/3) - external |
J8 |
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USER CONFIGURABLE SETTINGS | |||
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Function |
Location |
Setting | |
| » |
Floppy drive enabled |
S1/switch 1 |
on |
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Floppy drive disabled |
S1/switch 1 |
off | |
| » |
Floppy drive change signal sense enabled |
S1/switch 2 |
on |
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Floppy drive change signal sense disabled |
S1/switch 2 |
off | |
| » |
Single speed floppy drives supported |
S1/switch 3 |
off |
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Dual speed floppy drives supported |
S1/switch 3 |
on | |
| » |
Floppy drive precompensation is 125ns |
S1/switch 4 |
off |
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Floppy drive precompensation is 187ns |
S1/switch 4 |
on | |
| » |
VGA port enabled |
S2/switch 1 |
on |
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VGA port disabled |
S2/switch 1 |
off | |
| » |
16-bit video bus enabled |
S2/switch 2 |
off |
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8-bit video bus enabled |
S2/switch 2 |
on | |
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USER CONFIGURABLE SETTINGS | |||
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Function |
Location |
Setting | |
| » |
Hard drive enabled |
S2/switch 4 |
on |
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Hard drive disabled |
S2/switch 4 |
off | |
| » |
Pin 34 on IDE interface not grounded |
S2/switch 7 |
on |
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Pin 34 on IDE interface grounded |
S2/switch 7 |
off | |
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SERIAL PORT 1 (J3) CONFIGURATION - S3 | ||||
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Function |
Switch 1 |
Switch 2 |
Switch 3 |
Switch 4 |
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COM1, IRQ4 |
on |
off |
off |
on |
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COM1, IRQ3 |
on |
off |
on |
off |
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COM3, IRQ4 |
off |
on |
off |
on |
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COM3, IRQ3 |
off |
on |
on |
off |
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Disabled |
off |
off |
off |
off |
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SERIAL PORT 2 (J4) CONFIGURATION - S3 | ||||
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Function |
Switch 5 |
Switch 6 |
Switch 7 |
Switch 8 |
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COM2, IRQ4 |
on |
off |
off |
on |
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COM2, IRQ3 |
on |
off |
on |
off |
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COM4, IRQ4 |
off |
on |
off |
on |
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COM4, IRQ3 |
off |
on |
on |
off |
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Disabled |
off |
off |
off |
off |
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PARALLEL PORT (J8) CONFIGURATION - S4 | ||||
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LPT |
Switch 1 |
Switch 2 |
Switch 3 | |
| » |
LPT1 |
off |
off |
off |
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LPT2 |
off |
off |
on | |
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LPT3 |
off |
on |
off | |
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Disabled |
off |
on |
on | |
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PARALLEL PORT (J8) INTERRUPT REQUEST - S4 | |||
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IRQ |
Switch 5 |
Switch 6 | |
| » |
IRQ7 |
off |
on |
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IRQ5 |
on |
off | |
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Disabled |
off |
off | |
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IDE IOCHRDY PIN SELECTION | ||||
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Function |
S2/switch 5 |
S2/switch 6 | ||
| » |
IDE IOCHRDY from IDE pin 21 enabled |
on |
off | |
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IDE IOCHRDY from IDE pin 27 enabled |
off |
on | ||
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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. | ||||
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MISCELLANEOUS TECHNICAL NOTES |
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All other switches and jumpers are factory configured - do not alter. |