The TEAC FD-235HS is a half-height 3.5-inch micro floppy disk drive with SCSI interface, engineered for dual-density read/write operations on standard 3.5-inch floppy media. This drive delivers 1 MB capacity in Normal Density mode and 2 MB in High Density mode, with data transfer rates of 250 kbits/s (DD) and 500 kbits/s (HD) respectively. A brushless direct-drive motor operating at 300 RPM with 5.3 track/mm (135 TPI) track density ensures reliable, simplified mechanical operation.
Technical Specifications
• Interface: SCSI-1 (ANSI X3.131-1985) via 50-pin connector
• Data Capacity: 1 MB (Normal Density), 2 MB (High Density)
• Data Transfer Rates: 250 kbits/s (DD), 500 kbits/s (HD), 556 kbytes/s asynchronous
• Disk Speed: 300 RPM
• Track Density: 5.3 track/mm [135 TPI]
• Internal Buffer: 31 KB
• Power Supply: +5 V (4.75–5.25 V), single rail
• Power Consumption: 15 mW (standby), 1.1 W (read/write), 2.1 W (seek)
• Ripple Specification: <100 mVp-p
• Form Factor: Half-height; 101.6 mm W × 33.3 mm H
– Key Features
• Configurable SCSI ID (0–7) via board straps; factory default 0
• Selectable input parity check; output parity always enabled
• Detachable 220/330 Ω ±5% terminator (factory-installed)
• Dual-mode operation supports both DD and HD 3.5-inch micro floppy disks
• Single-initiator, single-target SCSI configuration
– Typical Applications
Legacy computer systems, industrial controllers, and archived data retrieval requiring dual-density floppy disk compatibility with SCSI connectivity.
– Compatibility & Integration
The FD-235HS integrates into systems requiring SCSI-1 interface protocol. TERMPWR terminal available for interface terminator power supply. Compatible with 3.5-inch micro floppy disks mutually agreed upon between customer and TEAC.
