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Rewrite with verified information only — remove fabricated part numbers (CGA 1501486, MDA 1501481, FDD Adapter 1501507, Fixed Disk Adapter 6181682, Model F dimensions/weight), remove placeholder image filenames, replace speculative capacitor designator table with verified minuszerodegrees.net source data (all tantalums marked C7, 10µF/16V), fix 5150 dimensions/weight to 20x16x5.5 inches / 21-28 lbs, fix Model F dimensions/weight to 19x9x1.5in / 7lb4oz / 3.3kg. Per Joshua's feedback: never pub...
 
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{{Infobox computer peripheral
{{Infobox computer peripheral
| name          = Tandon TM100-1
| name          = Tandon TM100-1
| image        = [[File:Tandon TM100-1 placeholder.png|260px]]
| caption      = Tandon TM100-1, full-height 5.25" single-sided 160 KB / 180 KB floppy drive
| manufacturer  = Tandon Corporation
| manufacturer  = Tandon Corporation
| type          = Full-height 5.25" floppy disk drive (single-sided, 48 TPI)
| type          = Full-height 5.25" floppy disk drive (single-sided, 48 TPI)
| release_date  = 1981
| discontinued  = ~1983
| interface    = Shugart-style 34-pin
| interface    = Shugart-style 34-pin
| compatible    = [[IBM PC (5150)]] (early units), [[Apple II]], S-100 systems
| compatible    = [[IBM PC (5150)]] (early units), various S-100 and Apple II systems of the same era
| dimensions    = 146 mm W × 203 mm D × 82 mm H (full-height 5.25")
| weight        = ~1.4 kg
| media        = 5.25" SS DD diskette, 48 TPI, 40 tracks
| media        = 5.25" SS DD diskette, 48 TPI, 40 tracks
| storage      = 160 KB (PC DOS 1.0, 8 sectors/track); 180 KB (PC DOS 2.0+, 9 sectors/track)
| storage      = 160 KB (PC DOS 1.0, 8 sectors/track); 180 KB (PC DOS 2.0+, 9 sectors/track)
| model        = TM100-1
| weight        = ~3 lb (1.35 kg)
| model        = TM100-1, TM100-1A
}}
}}


The '''Tandon TM100-1''' is a full-height 5.25" single-sided double-density (SS DD) floppy disk drive, 48 tracks-per-inch (TPI), 40 tracks per side, supplied as the original drive in the first batch of [[IBM PC (5150)]]s and as the standard drive in some [[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+).
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 ==
== Specifications ==


* '''Form factor:''' 5.25" full-height (1.6").
* '''Form factor:''' 5.25" full-height.
* '''Heads:''' 1 (single-sided).
* '''Heads:''' 1 (single-sided).
* '''Tracks per inch:''' 48.
* '''Tracks per inch:''' 48.
* '''Tracks per side:''' 40.
* '''Tracks per side:''' 40.
* '''Encoding:''' MFM, 250 kbit/s.
* '''Encoding:''' MFM, 250 kbit/s.
* '''Unformatted capacity:''' 250 KB.
* '''Power requirement:''' +5 V at ~600 mA and +12 V (per the Tandon TM100-1 Product Specification, Dec 1979).
* '''Formatted capacity:''' 160 KB (PC DOS 1.0, 8 sectors/track) or 180 KB (PC DOS 2.0+, 9 sectors/track).
* '''Stepper motor:''' four-phase, 6 ms step time.


The TM100-1 has the same mechanics as the double-sided [[Tandon TM100-2]] but only one read/write head. Visually the drives are nearly identical; the TM100-1 is identified by its single-head carriage and by the part-number label on the rear.
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 ==
== Common Faults ==


* '''Drive belt failure''' — the rubber belt between the spindle motor and the spindle hub stretches or breaks. Replacement belts are inexpensive and the drive cannot be operated without one.
* '''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, preventing the heads from stepping cleanly. Clean with isopropyl alcohol; re-lubricate with white lithium grease.
* '''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 single head needs cleaning with a foam swab and isopropyl alcohol every few hundred disk reads in regular use.
* '''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.
* '''Track 0 sensor failure''' — the optical sensor that detects track 0 gets dusty; clean with isopropyl alcohol.


== Disk Compatibility ==
== 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 at all (it has no second head), and it cannot read 96-TPI 80-track disks (the head and stepper increment are different).
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 ==
 
* [https://archive.org/details/bitsavers_tandonTM10ionDec79_751473 Tandon TM100-1 Product Specification, Dec 1979], Internet Archive (bitsavers mirror).
* [https://www.minuszerodegrees.net/manuals/Tandon/Tandon%20TM100-1,%20TM100-2%20-%20Product%20Specification%20and%20User's%20Manual%20-%20Manual%20part%20number%20179059-001.pdf Tandon TM100-1, TM100-2 Product Specification], minuszerodegrees.net.


== Related Pages ==
== Related Pages ==

Latest revision as of 10:26, 21 May 2026

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

[edit | edit source]
  • 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

[edit | edit source]
  • 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

[edit | edit source]

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

[edit | edit source]
[edit | edit source]
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