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# SCIENTIFIC MICRO SYSTEMS
OMTI 5520, OMTI 5527
Data bus: 8-bit, ISA
Size: Half-length, full height card
Hard drives supported: OMTI 5520:Two MFM ST506/ST412 drives
OMTI 5527:Two RLL ST506/ST412 drives
Floppy drives supported: None
Maximum heads/cyl.: 16 heads and 2048 cylinders
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|-------------------------------------------+----------------|
| 34-pin control cable connector-hard drive | CN1 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 0 | CN2 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 1 | CN3 |
|-------------------------------------------+----------------|
| 6-pin DC power connector | J4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Location | Setting |
|------------------------------------+-------------+---------|
| » | BIOS enabled | W7 | open |
|---+--------------------------------+-------------+---------|
| | BIOS disabled | W7 | closed |
|---+--------------------------------+-------------+---------|
| » | BIOS base address is C8000h | W8 | open |
|---+--------------------------------+-------------+---------|
| | BIOS base address is CA000h | W8 | closed |
|---+--------------------------------+-------------+---------|
| » | Drive 0 soft sectored | W11 | open |
|---+--------------------------------+-------------+---------|
| | Drive 0 hard sectored | W11 | closed |
|---+--------------------------------+-------------+---------|
| » | Drive 1 soft sectored | W14 | open |
|---+--------------------------------+-------------+---------|
| | Drive 1 hard sectored | W14 | closed |
|---+--------------------------------+-------------+---------|
| | Not used | WP9 | |
|---+--------------------------------+-------------+---------|
| | Drive 0 is a removable drive | W10 | closed |
| | ;drive 1 is a fixed drive | | |
| | | W11 | open |
| | (OMTI 5527 only,JP10-11 are | | |
| | not used on the 5520) | | |
|---+--------------------------------+-------------+---------|
| | Drive 0 & 1 are both hard | W10 | open |
| | sectored | | |
| | | W11 | closed |
| | (OMTI 5527 only, JP10-11 are | | |
| | not used on the OMTI 5520.) | | |
|---+--------------------------------+-------------+---------|
| » | Factory configured - do not | W12 | N/A |
| | alter | | |
|---+--------------------------------+-------------+---------|
| » | Not documented | W17,19,20, | N/A |
| | | | |
| | | 27,28,29,30 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| I/O PORT ADDRESS |
|------------------------------------------------------------|
| Address | Jumper W5 | Jumper W6 |
|-------------------+--------------------+-------------------|
| » | 320h | open | open |
|---+---------------+--------------------+-------------------|
| | 324h | closed | open |
|---+---------------+--------------------+-------------------|
| | 328h | open | closed |
|---+---------------+--------------------+-------------------|
| | 32Ch | closed | closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTES |
|------------------------------------------------------------|
| W1 through W4 are used to configured the drive type as |
| supported by the BIOS. To support most of the drives on |
| the market, there are several different BIOS’s offered. |
| The different BIOS drive type tables are listed with the |
| OMTI 5510; The settings are the same for the 5520 and the |
| 5527 |
+------------------------------------------------------------+