Apple PowerBook Duo Floppy Adapter - Revision history

Josh: Add a link to the Usenet copy of the Duo FAQ

2026-10-04T12:42:26Z

Add a link to the Usenet copy of the Duo FAQ

← Older revision		Revision as of 13:42, 4 October 2026
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	The '''PowerBook Duo Floppy Adapter''' is Apple's smallest dock for the PowerBook Duo. It clips onto the Duo's 152-pin docking connector and provides an HDI-20 port for the external 1.4 MB floppy drive and an ADB port for a mouse or keyboard.<ref name="ss200up">Apple Computer, ''PowerBook 200 Series'' Service Source, Upgrades chapter, "Floppy Adapter", PDF pp. 207–208. Hosted as [[:File:PowerBook Duo 200 Series Service Source.pdf]]; described on [[PowerBook Duo 200 Series Service Source]]. Attaches to the 152-pin docking connector; HDI-20 floppy port and ADB port; release button; whole-unit exchange.</ref> The Duo has no floppy drive of its own and needs this adapter or the [[Apple PowerBook Duo MiniDock\|Duo MiniDock]] to use one.<ref name="ss200spec">Apple Computer, ''PowerBook 200 Series'' Service Source, Specifications, "Disk Storage", PDF p. 18. External 1.4 MB floppy drive, the same drive as the PowerBook 100's, requiring the Duo Floppy Adapter or Duo MiniDock.</ref> It came out with the first Duos on 19 October 1992 and carries the model number M7781.<ref name="wpduo">Wikipedia, "PowerBook Duo", section "Floppy Adapter", https://en.wikipedia.org/wiki/PowerBook_Duo (read 4 October 2026). Model M7781; informally called a Micro Dock.</ref> The Duo FAQ of 1994 says it was made by E-Machines and sold by Apple for about $80, and that for some three months after the Duo's launch it was the only dock available.<ref name="duofaq">Nicholas C. De Mello, ''FAQ about Macintosh Duos'', revision of 9 July 1994, part 2, "Micro-Docks", items 1 to 5. Contemporary user FAQ from the comp.sys.mac.portables newsgroup.</ref>		The '''PowerBook Duo Floppy Adapter''' is Apple's smallest dock for the PowerBook Duo. It clips onto the Duo's 152-pin docking connector and provides an HDI-20 port for the external 1.4 MB floppy drive and an ADB port for a mouse or keyboard.<ref name="ss200up">Apple Computer, ''PowerBook 200 Series'' Service Source, Upgrades chapter, "Floppy Adapter", PDF pp. 207–208. Hosted as [[:File:PowerBook Duo 200 Series Service Source.pdf]]; described on [[PowerBook Duo 200 Series Service Source]]. Attaches to the 152-pin docking connector; HDI-20 floppy port and ADB port; release button; whole-unit exchange.</ref> The Duo has no floppy drive of its own and needs this adapter or the [[Apple PowerBook Duo MiniDock\|Duo MiniDock]] to use one.<ref name="ss200spec">Apple Computer, ''PowerBook 200 Series'' Service Source, Specifications, "Disk Storage", PDF p. 18. External 1.4 MB floppy drive, the same drive as the PowerBook 100's, requiring the Duo Floppy Adapter or Duo MiniDock.</ref> It came out with the first Duos on 19 October 1992 and carries the model number M7781.<ref name="wpduo">Wikipedia, "PowerBook Duo", section "Floppy Adapter", https://en.wikipedia.org/wiki/PowerBook_Duo (read 4 October 2026). Model M7781; informally called a Micro Dock.</ref> The Duo FAQ of 1994 says it was made by E-Machines and sold by Apple for about $80, and that for some three months after the Duo's launch it was the only dock available.<ref name="duofaq">Nicholas C. De Mello, ''FAQ about Macintosh Duos'', revision of 9 July 1994, part 2, "Micro-Docks", items 1 to 5. Contemporary user FAQ from the comp.sys.mac.portables newsgroup. Part 2 of the May 1994 revision, as posted to comp.sys.mac.portables: [https://groups.google.com/g/comp.sys.mac.portables/c/YSn_AagRq0E Google Groups].</ref>

	== Specifications ==		== Specifications ==

Josh: Link the 280c through the Duo 280 page

2026-10-04T12:05:24Z

Link the 280c through the Duo 280 page

← Older revision		Revision as of 13:05, 4 October 2026
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	\| model = M7781		\| model = M7781
	\| interface = 152-pin processor-direct slot docking connector		\| interface = 152-pin processor-direct slot docking connector
	\| compatible = [[PowerBook Duo 210]], [[PowerBook Duo 230]], [[PowerBook Duo 250]], [[PowerBook Duo 270c]], [[PowerBook Duo 280]]~~, [[PowerBook Duo~~ 280c]], [[PowerBook Duo 2300]]		\| compatible = [[PowerBook Duo 210]], [[PowerBook Duo 230]], [[PowerBook Duo 250]], [[PowerBook Duo 270c]], [[PowerBook Duo 280]] and 280c, [[PowerBook Duo 2300]]
	\| dimensions = 1.5 × 5.0 × 2.6 in (H × W × D)		\| dimensions = 1.5 × 5.0 × 2.6 in (H × W × D)
	\| weight = 0.3 lb (0.14 kg)		\| weight = 0.3 lb (0.14 kg)

Josh: New page: Duo Floppy Adapter from the Duo Service Source and Apple Facts

2026-10-04T12:04:27Z

New page: Duo Floppy Adapter from the Duo Service Source and Apple Facts

New page

{{Infobox computer peripheral
| name = PowerBook Duo Floppy Adapter
| image = [[File:PowerBook Duo Floppy Adapter (Service Source).png|260px|frameless]]
| caption = The Floppy Adapter and the Duo's docking port, from Apple's Service Source
| manufacturer = Apple Computer (built by E-Machines)
| type = Floppy and ADB adapter for the PowerBook Duo
| release_date = 19 October 1992
| model = M7781
| interface = 152-pin processor-direct slot docking connector
| compatible = [[PowerBook Duo 210]], [[PowerBook Duo 230]], [[PowerBook Duo 250]], [[PowerBook Duo 270c]], [[PowerBook Duo 280]], [[PowerBook Duo 280c]], [[PowerBook Duo 2300]]
| dimensions = 1.5 × 5.0 × 2.6 in (H × W × D)
| weight = 0.3 lb (0.14 kg)
}}
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The '''PowerBook Duo Floppy Adapter''' is Apple's smallest dock for the PowerBook Duo. It clips onto the Duo's 152-pin docking connector and provides an HDI-20 port for the external 1.4 MB floppy drive and an ADB port for a mouse or keyboard.<ref name="ss200up">Apple Computer, ''PowerBook 200 Series'' Service Source, Upgrades chapter, "Floppy Adapter", PDF pp. 207–208. Hosted as [[:File:PowerBook Duo 200 Series Service Source.pdf]]; described on [[PowerBook Duo 200 Series Service Source]]. Attaches to the 152-pin docking connector; HDI-20 floppy port and ADB port; release button; whole-unit exchange.</ref> The Duo has no floppy drive of its own and needs this adapter or the [[Apple PowerBook Duo MiniDock|Duo MiniDock]] to use one.<ref name="ss200spec">Apple Computer, ''PowerBook 200 Series'' Service Source, Specifications, "Disk Storage", PDF p. 18. External 1.4 MB floppy drive, the same drive as the PowerBook 100's, requiring the Duo Floppy Adapter or Duo MiniDock.</ref> It came out with the first Duos on 19 October 1992 and carries the model number M7781.<ref name="wpduo">Wikipedia, "PowerBook Duo", section "Floppy Adapter", https://en.wikipedia.org/wiki/PowerBook_Duo (read 4 October 2026). Model M7781; informally called a Micro Dock.</ref> The Duo FAQ of 1994 says it was made by E-Machines and sold by Apple for about $80, and that for some three months after the Duo's launch it was the only dock available.<ref name="duofaq">Nicholas C. De Mello, ''FAQ about Macintosh Duos'', revision of 9 July 1994, part 2, "Micro-Docks", items 1 to 5. Contemporary user FAQ from the comp.sys.mac.portables newsgroup.</ref>

== Specifications ==
{| class="wikitable styled-table" style="width:70%; text-align:left;"
|+'''Floppy Adapter (Apple Facts)'''<ref name="af9410">Apple Computer, ''Apple Facts'', October 1994, "PowerBook Duo Floppy Adapter at a glance", PDF p. 91, https://vintageapple.org/applefacts/pdf/Apple_Facts_9410_10.94_October_1994.pdf (retrieved 2026-10-04).</ref><ref name="af9302">Apple Computer, ''Apple Facts'', February 1993, "Macintosh PowerBook Duo Floppy Adapter at a glance", PDF p. 57, https://vintageapple.org/applefacts/pdf/Apple_Facts_9302_2.93_February_1993.pdf (retrieved 2026-10-04).</ref>
! Item !! Specification
|-
| Ports || External floppy disk drive (HDI-20); ADB
|-
| Security || Security slot to stop the system being removed
|-
| Dimensions (H × W × D) || 1.5 × 5.0 × 2.6 in (3.8 × 12.7 × 6.6 cm in October 1994; 3.9 × 12.6 × 6.7 cm in February 1993)
|-
| Weight || 0.3 lb (0.14 kg)
|}
The Duo 2300c Service Source limits ADB devices on the Floppy Adapter to 100 mA in total.<ref name="ss2300">Apple Computer, ''PowerBook Duo 2300c'' Service Source, Specifications, PDF p. 21. Hosted as [[:File:PowerBook Duo 2300c Service Source.pdf]].</ref> The adapter leaves the Duo's serial port and modem jack uncovered.<ref name="duofaq" />

== Fitting and removing ==
# Raise the Duo's I/O door.
# Push the adapter firmly onto the external 152-pin docking port, with its release button up.
# To remove it, press the release button and pull the adapter off.<ref name="ss200up" />
Apple serviced the adapter by whole-unit exchange; the Service Source gives no take-apart procedure or parts for it.<ref name="ss200up" />

== Troubleshooting ==
Apple's charts for the external floppy drive on a Duo put the adapter after the cable and before the drive:<ref name="ss200ts">Apple Computer, ''PowerBook 200 Series'' Service Source, Troubleshooting chapter, "Symptom Charts/External Floppy Drive", PDF pp. 51–54, and "Peripherals", PDF pp. 56–64.</ref>
{| class="wikitable styled-table" style="width:100%; text-align:left;"
|+'''External floppy faults through the adapter (Apple symptom charts)'''<ref name="ss200ts" />
! Symptom !! Action, in Apple's order
|-
| Picture and sound present but the external drive does not work || Check the adapter's connection to the PowerBook; try a known-good disk; check, then replace, the floppy drive cable; replace the floppy adapter; replace the drive; replace the logic board
|-
| Disk ejects at startup, Mac icon with a blinking X || Known-good system disk; check that the trackball or mouse button is not stuck; floppy cable; floppy adapter; drive; logic board
|-
| Disk does not eject || Hold the mouse or trackball button down while switching on, or push a straightened paper clip into the hole beside the slot; floppy cable; floppy adapter; drive; logic board
|-
| Disk initialisation fails, or read, write and copy errors || Known-good disk; floppy cable; floppy adapter; drive
|-
| Cursor does not move with a mouse on the adapter || Check the adapter and mouse connections; press Command-Control-Power On; clean the mouse; then replace the mouse, the adapter and the logic board in turn
|}
When replacing a Duo logic board for these faults, Apple says to check that both EMI clips are secure on the CPU stiffener.<ref name="ss200ts" /> See [[Floppy Drive Repair]] for the drive itself.

== Third-party micro docks ==
Other makers built docks in the same shape as the Floppy Adapter, each with an ADB port and one other connection. The Duo FAQ of July 1994 lists the Newer Technology SCSI MicroDock and the Lapis SCSI Dock (HDI-30 SCSI with SCSI disk mode), the Newer Technology Color MicroDock (8-bit video and sound out) and Ethernet micro docks from Newer Technology and Asanté.<ref name="duofaq" /> Apple did not sell SCSI, video or Ethernet versions.<ref name="af9410b">Apple Computer, ''Apple Facts'', October 1994, "PowerBook Duo Accessories", PDF p. 92: Duo Dock and Duo Dock II, MiniDock, Floppy Adapter, HDI-20 floppy drive, Duo Express Modem, rechargeable battery, battery recharger, AC adapter, File Assistant and PowerBook/DOS Companion.</ref>

== Gallery ==
<gallery mode="packed" heights="200">
File:PowerBook Duo with floppy adapter and external drive (Dpaanlka).jpg|A PowerBook Duo with a half-round micro dock on its docking connector, cabled to an external floppy drive (Dpaanlka, public domain)
</gallery>

== Related pages ==
* [[Apple PowerBook Duo MiniDock]]
* [[Apple PowerBook Duo Dock]]
* [[PowerBook Duo General Maintenance]]
* [[PowerBook Duo Troubleshooting]]

== References ==
<references />

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[[Category:Apple Vintage Accessories]]