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 |
|
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 drive |
W4 |
closed | |
| » |
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 drive |
W7 |
closed | |
| » |
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 drive this trace must be cut |
W12 |
open | |
|
If the drive on CN4 is a ESDI drive this trace must be cut |
W13 |
open | |
| » |
Floppy drive port address is 3F0-3F7 |
W14 |
open |
|
Floppy drive port address is 370-377 |
W14 |
closed | |
| » |
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 string mode |
W21 |
open |
|
I/O speed set to loop |
W21 |
closed | |
| » |
If BIOS is #1002661, then drive 0 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. |
W22 |
open |
| » |
Factory configured - do not alter |
W22 |
closed |
| » |
If BIOS is #1002661, then drive 1 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. |
W23 |
open |
| » |
Factory configured - do not alter |
W23 |
closed |
|
SECTOR CONFIGURATION | ||||
|
Jumper W10 |
Jumper W11 |
BPS (ST506 only) |
SPT- 8620 |
SPT- 8627 |
|
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 |