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# TANDY/RADIO SHACK
250-4161/250-4161A
Card type Hard drive controller
Hard Drives supported Up to 7 SCSI devices
Floppy drives supported None
Data Bus 16-bit ISA
Card Size Half-length, full-height card
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location | Function | Location |
|-------------------+----------+------------------+----------|
| 50-pin SCSI | CN1 | Drive active LED | LED |
| connector - | | | |
| internal | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-----------------------------------------+-------+----------|
| » | TERMPWR supplied from host adapter | F1 | Closed |
| | to SCSI interface | | |
|---+-------------------------------------+-------+----------|
| | TERMPWR not supplied to SCSI | F1 | Open |
| | interface | | |
|---+-------------------------------------+-------+----------|
| » | Synchronous Negotiation disabled | J1/1 | Open |
|---+-------------------------------------+-------+----------|
| | Synchronous Negotiation enabled | J1/1 | Closed |
|---+-------------------------------------+-------+----------|
| » | Factory configured - do not alter | J1/2 | Open |
|---+-------------------------------------+-------+----------|
| » | SCSI parity check enabled | J1/3 | Open |
|---+-------------------------------------+-------+----------|
| | SCSI parity check disabled | J1/3 | Closed |
|---+-------------------------------------+-------+----------|
| » | Zero wait states enabled | J4 | Open |
|---+-------------------------------------+-------+----------|
| | One wait state enabled | J4 | Closed |
|---+-------------------------------------+-------+----------|
| » | System computer is Tandy 4000 | J5 | Open |
|---+-------------------------------------+-------+----------|
| | System computer is Tandy 3000 | J5 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL SELECTION |
|------------------------------------------------------------|
| Channel | J1/7 | J1/8 | J6/1 | J6/2 | J6/3 |
|----------+---------+---------+---------+---------+---------|
| | 0 | Closed | Closed | Closed | Open | Open |
|----+-----+---------+---------+---------+---------+---------|
| » | 5 | Open | Closed | Open | Closed | Open |
|----+-----+---------+---------+---------+---------+---------|
| | 6 | Closed | Open | Open | Open | Closed |
|----+-----+---------+---------+---------+---------+---------|
| | 7 | Open | Open | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL SELECTION (CONTINUED) |
|------------------------------------------------------------|
| Channel | J6/4 | J7/1 | J7/2 | J7/3 | J7/4 |
|----------+---------+---------+---------+---------+---------|
| | 0 | Open | Closed | Open | Open | Open |
|----+-----+---------+---------+---------+---------+---------|
| » | 5 | Open | Open | Closed | Open | Open |
|----+-----+---------+---------+---------+---------+---------|
| | 6 | Open | Open | Open | Closed | Open |
|----+-----+---------+---------+---------+---------+---------|
| | 7 | Closed | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECTION |
|------------------------------------------------------------|
| Setting | J1/9 | J1/10 | J1/11 | J8/1 | J8/2 |
|----------+---------+---------+---------+---------+---------|
| | 9 | Open | Open | Open | Closed | Open |
|----+-----+---------+---------+---------+---------+---------|
| | 10 | Closed | Open | Open | Open | Closed |
|----+-----+---------+---------+---------+---------+---------|
| » | 11 | Open | Closed | Open | Open | Open |
|----+-----+---------+---------+---------+---------+---------|
| | 13 | Closed | Closed | Open | Open | Open |
|----+-----+---------+---------+---------+---------+---------|
| | 14 | Open | Open | Closed | Open | Open |
|----+-----+---------+---------+---------+---------+---------|
| | 15 | Closed | Open | Closed | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECTION (CONTINUED) |
|------------------------------------------------------------|
| Setting | J8/3 | J8/4 | J8/5 | J8/6 |
|------------+-----------+-----------+-----------+-----------|
| | 9 | Open | Open | Open | Open |
|----+-------+-----------+-----------+-----------+-----------|
| | 10 | Open | Open | Open | Open |
|----+-------+-----------+-----------+-----------+-----------|
| » | 11 | Closed | Open | Open | Open |
|----+-------+-----------+-----------+-----------+-----------|
| | 13 | Open | Closed | Open | Open |
|----+-------+-----------+-----------+-----------+-----------|
| | 14 | Open | Open | Closed | Open |
|----+-------+-----------+-----------+-----------+-----------|
| | 15 | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS ADDRESS SELECTION |
|------------------------------------------------------------|
| Address | J10/1 | J10/2 | J10/3 |
|------------------+-------------+-------------+-------------|
| | C0000h | Closed | Closed | Closed |
|---+--------------+-------------+-------------+-------------|
| | C4000h | Closed | Closed | Open |
|---+--------------+-------------+-------------+-------------|
| | C8000h | Closed | Open | Closed |
|---+--------------+-------------+-------------+-------------|
| | CC000h | Closed | Open | Open |
|---+--------------+-------------+-------------+-------------|
| | D0000h | Open | Closed | Closed |
|---+--------------+-------------+-------------+-------------|
| | D4000h | Open | Closed | Open |
|---+--------------+-------------+-------------+-------------|
| | D8000h | Open | Open | Closed |
|---+--------------+-------------+-------------+-------------|
| » | DC000h | Open | Open | Open |
+------------------------------------------------------------+
+---------------------------------------------------------------+
| BASE I/O ADDRESS SELECTION |
|---------------------------------------------------------------|
|Setting| J9/1 | J9/2 | J9/3 | J9/4 | J9/5 | J9/6 | J9/7 | J9/8 |
|-------+------+------+------+------+------+------+------+------|
| |004h|Closed| Open | Open | Open | Open | Open | Open | Open |
|--+----+------+------+------+------+------+------+------+------|
| |008h| Open |Closed| Open | Open | Open | Open | Open | Open |
|--+----+------+------+------+------+------+------+------+------|
| |00Ch|Closed|Closed| Open | Open | Open | Open | Open | Open |
|--+----+------+------+------+------+------+------+------+------|
| |010h| Open | Open |Closed| Open | Open | Open | Open | Open |
|--+----+------+------+------+------+------+------+------+------|
| |014h|Closed| Open |Closed| Open | Open | Open | Open | Open |
|--+----+------+------+------+------+------+------+------+------|
|» |330h| Open | Open |Closed|Closed| Open | Open |Closed|Closed|
|--+----+------+------+------+------+------+------+------+------|
| |3F0h| Open | Open |Closed|Closed|Closed|Closed|Closed|Closed|
|--+----+------+------+------+------+------+------+------+------|
| |3F4h|Closed| Open | Open | Open | Open | Open |Closed|Closed|
|--+----+------+------+------+------+------+------+------+------|
| |3F8h| Open | Open | Open | Open | Open | Open |Closed|Closed|
|--+----+------+------+------+------+------+------+------+------|
| |3FCh| Open |Closed|Closed|Closed|Closed|Closed|Closed|Closed|
|--+----+------+------+------+------+------+------+------+------|
| |3FFh|Closed|Closed|Closed|Closed|Closed|Closed|Closed|Closed|
|---------------------------------------------------------------|
| Note: |
| |
|The switches are a binary representation of the decimal memory |
|addresses. SW1/8 is the Most Significant Bit and switch SW1/1 |
|is the Least Significant Bit. The switches have the following |
|decimal values: SW1/8=512, SW1/7=256, SW1/6=128, SW1/5=64, |
|SW1/4=32, SW1/3=16, SW1/2=8, SW1/1=4. Add the values of the |
|closed jumpers to obtain the correct memory address. (Closed=1,|
|Open=0) |
+---------------------------------------------------------------+
+------------------------------------------------------------+
| ID SELECTION |
|------------------------------------------------------------|
| SCSI ID | J1/4 | J1/5 | J1/6 |
|---------------+--------------+--------------+--------------|
| | 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TERMINATION SELECTION |
|------------------------------------------------------------|
| Setting | RN6 | RN7 |
|----------------------------+---------------+---------------|
| » | Termination | Installed | Installed |
| | enabled | | |
|-------+--------------------+---------------+---------------|
| | Termination | Removed | Removed |
| | disabled | | |
|------------------------------------------------------------|
| Note: Terminators should be removed if inline |
| terminators are used or the host adapter is not at |
| the end of the SCSI bus. |
+------------------------------------------------------------+