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# ACCELERATED COMPUTER TECHNOLOGY, INC.
UNIVERSAL FLOPPY DISK CONTROLLER
Card Type Floppy drive controller
Chip Set Unidentified
Maximum Onboard None
Memory
I/O Options Floppy drive interface (3)
Data Bus 8-bit ISA
Floppy drives Four 360KB or 720KB drives
supported
Four 360KB, 720KB, 1.2MB, or 1.44MB drives
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|----------------------+-------+---------------------+-------|
| 34-pin floppy drive | J1 | 34-pin floppy drive | J3 |
| interface | | interface | |
|----------------------+-------+---------------------+-------|
| 37-pin floppy drive | J2 | | |
| interface | | | |
|------------------------------------------------------------|
| Note: J1 is the connector for drives A: and B:, either J2 |
| or J3 can be used to connect drives C: and D:. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|----------------------------------------+-------+-----------|
| | Step rate of floppy drive A is 3 | SW1/1 | On |
| | Ms | | |
|---+------------------------------------+-------+-----------|
| | Step rate of floppy drive A is 6 | SW1/1 | Off |
| | Ms | | |
|---+------------------------------------+-------+-----------|
| | Step rate of floppy drive B is 3 | SW1/5 | On |
| | Ms | | |
|---+------------------------------------+-------+-----------|
| | Step rate of floppy drive B is 6 | SW1/5 | Off |
| | Ms | | |
|---+------------------------------------+-------+-----------|
| | Step rate of floppy drive C is 3 | SW2/1 | On |
| | Ms | | |
|---+------------------------------------+-------+-----------|
| | Step rate of floppy drive C is 6 | SW2/1 | Off |
| | Ms | | |
|---+------------------------------------+-------+-----------|
| | Step rate of floppy drive D is 3 | SW2/5 | On |
| | Ms | | |
|---+------------------------------------+-------+-----------|
| | Step rate of floppy drive D is 6 | SW2/5 | Off |
| | Ms | | |
|---+------------------------------------+-------+-----------|
| | Drive order will be MODE 1(see | SW3/1 | Off |
| | MISCELLANEOUS TECHNICAL NOTE 2) | | |
|---+------------------------------------+-------+-----------|
| | Drive order will be MODE 2 (see | SW3/1 | On |
| | MISCELLANEOUS TECHNICAL NOTE 2) | | |
|---+------------------------------------+-------+-----------|
| | UFDC is the primary floppy drive | SW3/2 | Off |
| | controller | | |
|---+------------------------------------+-------+-----------|
| | UFDC is the secondary floppy drive | SW3/2 | On |
| | controller | | |
|---+------------------------------------+-------+-----------|
| » | EPROM enabled | SW3/3 | On |
|---+------------------------------------+-------+-----------|
| | EPROM disabled | SW3/3 | Off |
|---+------------------------------------+-------+-----------|
| » | TYPE 1 or 2 drives (see | W1 | Pins 1 & |
| | MISCELLANEOUS TECHNICAL NOTE 1) | | 2 closed |
|---+------------------------------------+-------+-----------|
| | TYPE 2 or 3 drives (see | W1 | Pins 2 & |
| | MISCELLANEOUS TECHNICAL NOTE 1) | | 3 closed |
|---+------------------------------------+-------+-----------|
| » | Pin 2 on the interface cable is an | W2 | Pins 1 & |
| | output signal | | 2 closed |
|---+------------------------------------+-------+-----------|
| | Pin 2 on the interface cable is an | W2 | Pins 2 & |
| | input signal (TYPE 2 drives only) | | 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE A CONFIGURATION |
|------------------------------------------------------------|
| Type | SW1/2 | SW1/3 | SW1/4 |
|---------------+--------------+--------------+--------------|
| 360KB (5.25) | On | On | Off |
|---------------+--------------+--------------+--------------|
| 1.2MB (5.25) | On | Off | On |
|---------------+--------------+--------------+--------------|
| 720KB (3.5) | On | Off | Off |
|---------------+--------------+--------------+--------------|
| 1.44MB (3.5) | Off | On | On |
|---------------+--------------+--------------+--------------|
| None | On | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE B CONFIGURATION |
|------------------------------------------------------------|
| Type | SW1/6 | SW1/7 | SW1/8 |
|---------------+--------------+--------------+--------------|
| 360KB (5.25) | On | On | Off |
|---------------+--------------+--------------+--------------|
| 1.2MB (5.25) | On | Off | On |
|---------------+--------------+--------------+--------------|
| 720KB (3.5) | On | Off | Off |
|---------------+--------------+--------------+--------------|
| 1.44MB (3.5) | Off | On | On |
|---------------+--------------+--------------+--------------|
| None | On | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE C CONFIGURATION |
|------------------------------------------------------------|
| Type | SW2/2 | SW2/3 | SW2/4 |
|---------------+--------------+--------------+--------------|
| 360KB (5.25) | On | On | Off |
|---------------+--------------+--------------+--------------|
| 1.2MB (5.25) | On | Off | On |
|---------------+--------------+--------------+--------------|
| 720KB (3.5) | On | Off | Off |
|---------------+--------------+--------------+--------------|
| 1.44MB (3.5) | Off | On | On |
|---------------+--------------+--------------+--------------|
| None | On | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOPPY DRIVE D CONFIGURATION |
|------------------------------------------------------------|
| Type | SW1/6 | SW1/7 | SW1/8 |
|---------------+--------------+--------------+--------------|
| 360KB (5.25) | On | On | Off |
|---------------+--------------+--------------+--------------|
| 1.2MB (5.25) | On | Off | On |
|---------------+--------------+--------------+--------------|
| 720KB (3.5) | On | Off | Off |
|---------------+--------------+--------------+--------------|
| 1.44MB (3.5) | Off | On | On |
|---------------+--------------+--------------+--------------|
| None | On | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EPROM ADDRESS CONFIGURATION |
|------------------------------------------------------------|
| Address | SW3/4 | SW3/5 | SW3/6 | SW3/7 | SW3/8 |
|--------------+---------+--------+--------+--------+--------|
| | C8000h | On | On | Off | On | On |
|---+----------+---------+--------+--------+--------+--------|
| » | CA000h | On | On | Off | On | Off |
|---+----------+---------+--------+--------+--------+--------|
| | CC000h | On | On | Off | Off | On |
|---+----------+---------+--------+--------+--------+--------|
| | CE000h | On | On | Off | Off | Off |
|---+----------+---------+--------+--------+--------+--------|
| | D0000h | On | Off | On | On | On |
|---+----------+---------+--------+--------+--------+--------|
| | D2000h | On | Off | On | On | Off |
|---+----------+---------+--------+--------+--------+--------|
| | D4000h | On | Off | On | Off | On |
|---+----------+---------+--------+--------+--------+--------|
| | D6000h | On | Off | On | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| EPROM ADDRESS CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Address | SW3/4 | SW3/5 | SW3/6 | SW3/7 | SW3/8 |
|----------+---------+---------+---------+---------+---------|
| D8000h | On | Off | Off | On | On |
|----------+---------+---------+---------+---------+---------|
| DA000h | On | Off | Off | On | Off |
|----------+---------+---------+---------+---------+---------|
| DC000h | On | Off | Off | Off | On |
|----------+---------+---------+---------+---------+---------|
| DE000h | On | Off | Off | Off | Off |
|----------+---------+---------+---------+---------+---------|
| E0000h | Off | Off | On | On | On |
|----------+---------+---------+---------+---------+---------|
| E2000h | Off | Off | On | On | Off |
|----------+---------+---------+---------+---------+---------|
| E4000h | Off | Off | On | Off | On |
|----------+---------+---------+---------+---------+---------|
| E6000h | Off | Off | On | Off | Off |
|----------+---------+---------+---------+---------+---------|
| E8000h | Off | Off | Off | On | On |
|----------+---------+---------+---------+---------+---------|
| EA000h | Off | Off | Off | On | Off |
|----------+---------+---------+---------+---------+---------|
| EC000h | Off | Off | Off | Off | On |
|----------+---------+---------+---------+---------+---------|
| EE000h | Off | Off | Off | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| NOTE 1: Due to the tight tolerances in the construction of |
| a 3.5" floppy disk, the write current applied to the heads |
| of the drive needs to be adjusted for either 720KB disks |
| or 1.44MB disks. Floppy disk drive manufactures have used |
| three different mechanisms to modify the write current. |
| They are: TYPE 1:These drives read the current on pin 2 of |
| the interface cable, a 1.44MB disk is assumed for a high |
| current, and a 720KB disk is assumed for a low current. |
| TYPE 2: These drives have a sensor that looks for a cutout |
| in the plastic shell of the disk. If the cutout is |
| present, a 1.44MB disk is assumed. TYPE 3: These drives |
| are found on the IBM PS/2 line of products. They read the |
| current on pin 2 of the interface cable in the opposite |
| manner of TYPE 1’s. That is, a high current signifies a |
| 720KB disk and a low current a 1.44MB disk. |
| |
| NOTE 2: If you have installed more than 2 floppy drives in |
| a system, you have a choice on how the controller treats |
| the third and fourth drives. MODE 1 sets the drives to A:, |
| B:, C:, & D:, in this system your hard drive will be the |
| first available letter. If you have 3 drives installed it |
| will be D:, and if you have all four installed it will be |
| E:. MODE 2 sets your first two floppy drives to A: & B:, |
| and assigns C: to the hard drive. To install additional |
| floppy drives under this system you will need to load a |
| device drive at boot time. |
+------------------------------------------------------------+