RX33 Flexible Disk Drive
From Computer History Wiki
DECmate III with RX33 in the system box underneath the monitor - the expansion box to the right contains an RX50 dual floppy drive
The RX33 Flexible Disk Drive was a half height floppy drive for 5.25" 1.2 MB floppies. It is a re-badged Teac FD-55GFR drive.
It is supported by the RQDX3 QBUS MFM disk controller; there was no UNIBUS controller for it. It was also used in a large number of other DEC products; e.g. in the MicroVAX 2000 and as a bootstrap device in Hierarchical Storage Controllers.
Specifications
- Weight - 1.10 kg (2.43 lb)
- Height - 4.32 cm (1.70 in)
- Width - 14.61 cm (5.75 in)
- Depth - 20.32 cm (8.00 in)
- Number of tracks - 80
- Number of heads - 2
- Track density - 96 tracks per inch
- Step rate - 3 ms per track
- Diskette size - 13.13 cm (5.25 in)
- Recording surfaces per diskette - 2
- Sectors per track
- normal density - 10
- high density - 15
- Capacity
- Bytes per drive
- high density - 409 KB
- normal density - 1200 KB
- Blocks per drive
- high density - 800
- normal density - 2400
- Bytes per drive
- Block size - 512 bytes
- Data transfer rate (to and from media)
- normal density - 250 Kbits per second
- high density - 500 Kbits per second
- Operating power - 4.1 watts
- Standby power - 1.5 watts
Operating Conditions
- Temperature range - 10°C to 46°C (50°F to 115°F)
- Temperature change rate - 11°C (20°F) per hour, maximum
- Relative humidity - 20% to 80% noncondensing
- Maximum wet-bulb temperature - 45°C (113°F)
- Minimum dew-point temperature - 2°C (36°F)
- Altitude - 2400 m (8000 ft) maximum
(Reduce maximum temperature by 1.8°C for each 1,000 meter (1.0°F for each 1,000 ft) increase in altitude.)
Nonoperating Conditions
- Temperature - 34°C to 60°C (30°F) to 140°F)
- Temperature change rate - 20°C (36°F) per hour, maximum
- Relative humidity - 5% to 90%
- Maximum wet-bulb temperature - 45°C (113°F) packaged
- Altitude - 9100 m (30,000 ft) maximum
