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DC420
PROMISE TECHNOLOGY, INC.
DC420
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Data bus:
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32-bit, VL-bus
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Size:
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Three/quarter-length, full-height card
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Hard drive supported:
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Two IDE (AT) interface drives
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Floppy drives supported:
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Two 360KB, 720KB, 1.2MB or 1.44MB drives
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CONNECTIONS
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Function
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Location
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25-pin parallel port - external
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CN1
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9-pin serial port 1 - external
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CN2
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10-pin serial port 2 - internal
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CN3
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34-pin control cable connector - floppy drive
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J1
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40-pin IDE (AT) Interface connector
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J3
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4-pin connector - drive active LED
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JP3
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USER CONFIGURABLE SETTINGS
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Function
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Location
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Setting
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Main board supports VL-bus ID3 (speed < 50MHz)
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JP1
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pins 1 & 2 closed
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Main board does not support VL-bus ID3 (speed > 50MHz)
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JP1
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pins 2 & 3 closed
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Factory configured - do not alter
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JP2
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pins 1 & 2 closed
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Floppy drive enabled
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JP4/G
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pins 1 & 2 closed
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Floppy drive disabled
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JP4/G
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pins 2 & 3 closed
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SERIAL PORT 1 (CN2) CONFIGURATION
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COM/Address/IRQ
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JP4/A
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JP4/B
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COM1/3F8h/IRQ4
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pins 1 & 2 closed
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pins 2 & 3 closed
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COM3/3E8h/IRQ4
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pins 2 & 3 closed
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pins 1 & 2 closed
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Disabled
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pins 2 & 3 closed
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pins 2 & 3 closed
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SERIAL PORT 2 (CN3) CONFIGURATION
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COM/Address/IRQ
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JP4/C
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JP4/D
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COM2/2F8h/IRQ3
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pins 1 & 2 closed
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pins 2 & 3 closed
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COM4/2E8h/IRQ3
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pins 2 & 3 closed
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pins 1 & 2 closed
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Disabled
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pins 2 & 3 closed
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pins 2 & 3 closed
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PARALLEL PORT (CN1) CONFIGURATION
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Address/IRQ
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JP4/E
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JP4/F
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JP4/H
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378h/IRQ7
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pin 1 & 2 closed
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pins 2 & 3 closed
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pins 2 & 3 closed
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3BCh/IRQ7
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pins 1 & 2 closed
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pins 1 & 2 closed
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pins 2 & 3 closed
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278h/IRQ5
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pins 2 & 3 closed
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pins 1 & 2 closed
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pins 1 & 2 closed
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Disabled
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pins 2 & 3 closed
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pins 2 & 3 closed
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all pins open
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PARALLEL PORT BI-DIRECTIONAL FUNCTION
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Setting
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JP5
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Bi-directional
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open
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Uni-directional
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closed
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MEMORY CONFIGURATION
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Size
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Bank 0
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Bank 1
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512KB
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(1) 512K x 8
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None
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1MB
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(1) 512K x 8
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(4) 256K x 4
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