Tandon TM100-1
| Tandon TM100-1 | |
|---|---|
| Manufacturer | Tandon Corporation |
| Type | Full-height 5.25" floppy disk drive (single-sided, 48 TPI) |
| Interface | Shugart-style 34-pin |
| Compatible | IBM PC (5150) (early units), various S-100 and Apple II systems of the same era |
| Weight | ~3 lb (1.35 kg) |
| Model | TM100-1, TM100-1A |
| Storage | 160 KB (PC DOS 1.0, 8 sectors/track); 180 KB (PC DOS 2.0+, 9 sectors/track) |
| Media | 5.25" SS DD diskette, 48 TPI, 40 tracks |
The Tandon TM100-1 is a full-height 5.25" single-sided double-density floppy disk drive, supplied as the original drive in the first batch of IBM PC (5150)s and as a popular drive in Apple II and S-100 systems of the same era. It stores 160 KB per disk under PC DOS 1.0 (180 KB under PC DOS 2.0+).
Specifications
- Form factor: 5.25" full-height.
- Heads: 1 (single-sided).
- Tracks per inch: 48.
- Tracks per side: 40.
- Encoding: MFM, 250 kbit/s.
- Power requirement: +5 V at ~600 mA and +12 V (per the Tandon TM100-1 Product Specification, Dec 1979).
The TM100-1 shares its mechanics with the double-sided Tandon TM100-2 but has only one read/write head. Visually the drives are nearly identical.
Common Faults
- Drive belt failure — the rubber belt between the spindle motor and the spindle hub stretches or breaks with age. Replacement belts are available from Console5 and others.
- Stepper grease drag — the head-positioner lead screw is lubricated with grease that hardens over decades. Clean with isopropyl alcohol; re-lubricate with white lithium grease.
- Dirty heads — the head needs cleaning with a foam swab and isopropyl alcohol periodically.
- Track 0 sensor failure — the optical sensor that detects track 0 gets dusty; clean with isopropyl alcohol.
Disk Compatibility
A TM100-1 can read single-sided disks written by any other 48-TPI MFM 40-track drive. It cannot read double-sided disks (it has no second head), and it cannot read 96-TPI 80-track disks.
References
- Tandon TM100-1 Product Specification, Dec 1979, Internet Archive (bitsavers mirror).
- Tandon TM100-1, TM100-2 Product Specification, minuszerodegrees.net.
Related Pages
- IBM PC (5150)
- Tandon TM100-2 — the double-sided successor
- IBM FDD Adapter — the controller card