Tandon TM100-1 - Revision history

Josh: 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...

2026-05-21T09:26:03Z

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...

← Older revision		Revision as of 10:26, 21 May 2026
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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 ==

Josh: Add {{Infobox computer peripheral}} per RTC_Style_Guide.md — peripheral pages must use the peripheral infobox

2026-05-21T09:07:17Z

Add {{Infobox computer peripheral}} per RTC_Style_Guide.md — peripheral pages must use the peripheral infobox

← Older revision		Revision as of 10:07, 21 May 2026
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			{{Infobox computer peripheral
			\| 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
			\| type = Full-height 5.25" floppy disk drive (single-sided, 48 TPI)
			\| release_date = 1981
			\| discontinued = ~1983
			\| interface = Shugart-style 34-pin
			\| compatible = [[IBM PC (5150)]] (early units), [[Apple II]], S-100 systems
			\| 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
			\| storage = 160 KB (PC DOS 1.0, 8 sectors/track); 180 KB (PC DOS 2.0+, 9 sectors/track)
			\| model = TM100-1
			}}

	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 (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+).

Josh: Create supporting page for the IBM PC (5150) article series

2026-05-21T09:03:43Z

Create supporting page for the IBM PC (5150) article series

New page

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+).

== Specifications ==

* '''Form factor:''' 5.25" full-height (1.6").
* '''Heads:''' 1 (single-sided).
* '''Tracks per inch:''' 48.
* '''Tracks per side:''' 40.
* '''Encoding:''' MFM, 250 kbit/s.
* '''Unformatted capacity:''' 250 KB.
* '''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.

== 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.
* '''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.
* '''Dirty heads''' — the single head needs cleaning with a foam swab and isopropyl alcohol every few hundred disk reads in regular use.
* '''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 at all (it has no second head), and it cannot read 96-TPI 80-track disks (the head and stepper increment are different).

== Related Pages ==

* [[IBM PC (5150)]]
* [[Tandon TM100-2]] — the double-sided successor
* [[IBM FDD Adapter]] — the controller card

[[Category:IBM]]