SCIENTIFIC MICRO SYSTEMS OMTI 8620, OMTI 8627 Data bus: 16-bit, ISA Size: Full-length, full-height card Hard drives supported: OMTI 8620:Two MFM ST506/ST412 drives or ESDI drives OMTI 8627:Two RLL ST506/ST412 or ESDI drives Floppy drives supported: Two 360KB, 720KB, 1.2MB, 1.44MB drives Sector interleave: 1:1 Maximum heads/cyl.: 16 heads and 2048 cylinders [Image] CONNECTIONS Function Location 34-pin control cable connecter-floppy drive J1 34-pin control cable connecter-hard drive J2 20-pin data cable connecter-drive 0 J3 20-pin data cable connecter-drive 1 J4 4-pin connecter-drive active LED J5 USER CONFIGURABLE SETTINGS Function Location Setting » Drive 1 set for fixed media drive W4 open Drive 1 set for removable media W4 closed drive » Drive 1 set for ST506 drive W5 open Drive 1 set for ESDI drive W5 closed » Drive 1 soft sectored W6 open Drive 1 hard sectored W6 closed » Drive 0 set for fixed media drive W7 open Drive 0 set for removable media W7 closed drive » Drive 0 set for ST506 drive W8 open Drive 0 set for ESDI drive W8 closed » Drive 0 soft sectored W9 open Drive 0 hard sectored W9 closed If the drive on CN3 is a ESDI W12 open drive this trace must be cut If the drive on CN4 is a ESDI W13 open drive this trace must be cut » Floppy drive port address is W14 open 3F0-3F7 Floppy drive port address is W14 closed 370-377 » BIOS base address is C8000h W15 open BIOS base address is CA000h W15 closed » BIOS enabled W16 open BIOS disabled W16 closed » Factory configured - do not alter W20 N/A » I/O speed set to high performance W21 open string mode I/O speed set to loop W21 closed » If BIOS is #1002661, then drive 0 W22 open parameters are set to 4 hds. and 612 cyl. If BIOS is #1002662, then drive 0 parameter are set to 4 hds. and 615 cyl. » Factory configured - do not alter W22 closed » If BIOS is #1002661, then drive 1 W23 open parameters are set to 4 hds. and 612 cyl.If BIOS is #1002662, then drive 1 parameter are set to 4 hds. and 615 cyl. » Factory configured - do not alter W23 closed SECTOR CONFIGURATION Jumper W10 Jumper W11 BPS (ST506 SPT- 8620 SPT- 8627 only) open open 512 17 26 open closed 512 17 26 closed open 1024 18 26 closed closed 1056 9 13 I/O PORT ADDRESS Address Jumper W17 Jumper W18 Jumper W19 320h open open open 324h open open closed 328h open closed open 32Ch open closed closed 1A0h closed open open 1A4h closed open closed 1A8h closed closed open 1ACh closed closed closed DRIVE TYPE CONFIGURATION - #1002579 DRIVE 0 DRIVE 2 W20 W21 W22 W23 Cyl. Hds. closed closed closed closed ESDI ESDI open closed open closed 987 7 closed open closed open 918 15 open open open open 612 4 DRIVE TYPE CONFIGURATION - #1002578 DRIVE 0 DRIVE 2 W20 W21 W22 W23 Cyl. Hds. closed closed closed closed ESDI ESDI open closed open closed 820 6 closed open closed open 1024 9 open open open open 615 4