SCIENTIFIC MICRO SYSTEMS OMTI 810, OMTI 812, OMTI 820, OMTI 822 Data bus: 16-bit, ISA Size: Full-length, full-height card Hard drives supported: Up to seven SCSI devices Floppy drives supported: OMTI 81x: None OMTI 82x: Two 360KB, 720KB, 1.2MB, 1.44MB Maximum heads/cyl.: 16 heads and 1024 cylinders [Image] CONNECTIONS Function Location 50-pin SCSI connector-internal J1 50-pin SCSI connector-external (Models 8x2 only) J2 34-pin control cable connector-floppy drive J3 4-pin connector-drive active LED J4 USER CONFIGURABLE SETTINGS Function Location Setting » SCSI parity check enabled W3 closed SCSI parity check disabled W3 open » Factory configured - do not alter W4 open » Factory configured - do not alter W10 open » AT-type floppy drives supported W11 open (Models 82x only) Non-stand. floppy drives W11 closed supported (Models 82x only) Factory set on board 32K PROM W15 open size » Factory configured - do not alter W26 open » SCSI-2 RSVD lines grounded W32 closed (terminators installed) SCSI-2 RSVD lines not grounded W32 open (terminators removed) » Floppy drive port address is W33 pins 1 & 2 3F0-3F7 (Models 82x only) closed Floppy drive port address is W33 pins 2 & 3 370-377 (Models 820x only) closed » Floppy drive enabled W35 closed Floppy drive disabled W35 open » Power-ground and chassis-ground W44 open separate Power-ground and chassis-ground W44 closed connected SCSI ADDRESS Address W0 W1 W2 0 closed closed closed 1 open closed closed 2 closed open closed 3 open open closed 4 closed closed open 5 open closed open 6 closed open open » 7 open open open BIOS ADDRESS Select W15 W16 W17 C0000h closed closed closed C8000h open closed closed D0000h closed open closed » D8000h open open closed E0000h closed closed open E8000 open closed open F0000h closed open open F8000h open open open I/O PORT ADDRESS Address W5 W6 W7 W8 W9 100 closed closed closed open closed 120 open closed closed open closed 140 closed open closed open closed 160 open open closed open closed 180 closed closed open open closed 1A0 open closed open open closed 1C0 closed open open open closed 1E0 open open open open closed 200 closed closed closed closed open 220 open closed closed closed open 240 closed open closed closed open 260 open open closed closed open 280 closed closed open closed open 2A0 open closed open closed open 2C0 closed open open closed open 2E0 open open open closed open 300 closed closed closed open open 320 open closed closed open open » 340 closed open closed open open 360 open open closed open open 380 closed closed open open open 3A0 open closed open open open 3C0 closed open open open open 3E0 open open open open open DMA CHANNEL Channel W20 W21 W22 W23 W24 W25 DRQ3 closed open open open closed closed » DRQ5 open closed open open closed open DRQ6 open open closed open open closed DRQ7 open open open closed open open INTERRUPT REQUEST IRQ W27 W28 W29 W30 Disabled N/A N/A N/A closed IRQ3 closed closed closed open IRQ4 open closed closed open IRQ5 closed open closed open IRQ6 open closed closed open IRQ7 closed closed open open » IRQ12 open closed open open IRQ14 closed open open open IRQ15 open open open open MISCELLANEOUS TECHNICAL NOTES W12-14, W31, W34, W36, W37, W43, W45 are factory configurable or Not used and are hard wired on some board revisions. The default for these jumpers is "open", with a jumper stored on pin 2.