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# CORONA COMPUTER CORPORATION
400 HDC
Data bus: 8-bit, ISA
Size: Full-length, full-height card
Hard drives supported: Two MFM ST506 drives
Floppy drives supported: Two 360KB, 720KB, 1.2MB, or 1.44MB
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Location |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 1 | CN1 |
|-------------------------------------------+----------------|
| 20-pin data cable connector-drive 0 | CN2 |
|-------------------------------------------+----------------|
| 34-pin control cable connector-hard drive | CN3 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRIVE TYPE COFIGURATION - SW1 |
|------------------------------------------------------------|
|Heads|Cyl.|Switch 1|Switch 2|Switch |Switch |Switch |Switch |
| | | | | 3 | 4 | 5 | 6 |
|-----+----+--------+--------+-------+-------+-------+-------|
| 2 |612 | on | off | off | on | on | on |
|-----+----+--------+--------+-------+-------+-------+-------|
| 4 |306 | on | off | off | off | off | off |
|-----+----+--------+--------+-------+-------+-------+-------|
| 4 |306 | off | off | off | off | off | off |
|-----+----+--------+--------+-------+-------+-------+-------|
| 4 |612 | on | on | on | off | off | off |
+------------------------------------------------------------+