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Floppy Drives

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Table of Contents Web Reference

5.25 Floppy Disk Drives

Apple Disk ][ Drive

Compatibility

:][, ][+, //e, or IIgs

Interface:

20 Pin IDC.

Connects via:

The Apple Disk II Controller or compatible/clone 20 pin IDC controller card. Using this drive with a IIgs would also require the controller card be installed internally, usually Slot 6 and that slot set via the Control Panel to 'Your Card' instead of 'Disk Port'.

//c, IIgs, and IIc Plus, IIgs ROM 3, LC Slot //e Card use:

See the section on Interfacing Information for more details.

Storage:

The Drive is compatible with ProDOS, DOS 3.3, Apple Pascal 1.2/1.3 & Apple CP/M It is a single sided,double density drive,It stores 143 K of information, or 560 Sectors of DOS 3.3, 280 ProDOS Blocks. This is a Apple GCR Device only and can not read any other formats even with additional software or hardware.

Technical Specifications:

It uses a Shugart Mechanism, and the Analog card is an Apple card. It can be adapted to a DB-19 but still falls under all the same usage restrictions as any other DB-19 drive that is NOT the 'Platinum' drive, and unless the conversion cable is equipped with an additional DB-19 connector the drive can only be used as the last device on a system as nothing else can attach to it. There are also many Third Party drives based on this same or similar design, some are out right duplications and others are completely different such as the Rana Elite Series.

Common problems occurred using this device: Heads need cleaned Speed Adjustment gets slow/faster. Plugged into controller card backwards or improperly aligned pins when plugged in.

20 Pin 5.25 Drive controller

The Apple Disk ][ Controller can be used for any brand 20 pin 5.25" drive. This controller is used in the Apple ][+ & //e. Can be used in a IIgs as well.

Drives Known to work with this card. (But not limited to these)


Model Name
Manufacture
Disk ][ Apple Computer
MicroSci A5xxx
MicroSci A70 High Density drive requires MicroSci CTRL'r)
Quentin Research Quentin Research
Vista 5.25 Vista Computer/ACP(They also made the 5 disk Jukebox)
SuperDrive 4th Dimension
Elite I,II,III Rana Systems(Elite II,III in 35/40 Track, Single Side mode only)
Super 5 Some island in the pacific


Table of Contents Web Reference


AppleDisk 5.25 / Compatibles (19 Pin)

DB-19 Connector version. Drives that fall into this category are the Apple DuoDisk, Apple UniDisk 5.25", AppleDisk 5.25", any converted 20 Pin drives and many drives offered by other vendors with a DB 19 cable and daisy chain pass through port. The DuoDisk does not offer the pass through port because it is a 2 drive unit and since the 5.25" is always the last device on a drive chain, it is not needed.


Compatibility:

][, ][+, //c, IIgs,, //e, Laser 128, Franklin Ace 500


(With either a DB-19 ('DuoDisk' / Apple 5.25" Controller) or a smartport (drive port) based computer such as the //c, IIgs, Laser 128, Franklin Ace 500.


Do NOT to plug these drives into any connection with the power to the computer ON! Bad Things do happen when you do this.


  • NOTE:20 pin drives that have been converted are only compatible with the ROM 01 IIgs. NOT the ROM 03,//c+^2or //e Emulation Card. See note(s) below.


NOTE:The Apple IIc Plus, IIgs ROM 03 and LC Slot //e Emulation card require the Apple Platinum AppleDisk 5.25 Drive. Model #A9M0107.


Uses:

Can be used as first or second drive.


Storage:

The Drive is compatible with ProDOS, DOS 3.3, Apple Pascal 1.2/1.3 & Apple CP/M It is a single sided,double density drive,It stores 143 K of information, or 560 Sectors of DOS 3.3, 280 ProDOS Blocks. This is a Apple GCR Device only and can not read any other formats even with additional software or hardware.


Common problems occurred using this device: Heads need cleaned Speed Adjustment gets slow/faster. Plugged into the computer with the power on. If this is done on a //c or IIgs you will kill the 341-0041 chip. (Known as the IWM or Incredible Woz Machine)


1) This drive does NOT have a "daisy-chain" port on the back of the drive. This means this drive must be the last drive on a chain or the only 5.25" drive. It can not be the first drive in a set of 2.


2) It seems that this condition sometimes may not apply to the //c+, depending on the date of manufacture of the computer,this should be approached on a case by case basis. If the drive works with AppleWorks 2.0 & ProDOS 8 1.7 & up, there should be no problems.

5.25 Drive Descriptions

Apple UniDisk 5.25

The UniDisk 5.25" drive is a beige single 5.25" drive. It is a DB-19 type drive that supports daisy chaining. It IS NOT compatible with the ROM 03 IIgs, or Macintosh LC //e emulator card.

This drive looks IDENTICAL to the AppleDisk 5.25" with the exception of the COLOR of the case. The Apple Disk 5.25" is a Platinum color.

Apple DuoDisk

The DuoDisk is a 2 drive unit that uses the DB-19 connector. This drive is compatible with an Apple ][+ or //e using a DB-19 Controller card and the ROM 01 IIgs. It will not work on a //c (The //c has 1 5.25" built in) or the //c+^2, ROM 03 IIgs or Macintosh LC //e emulator card.

AppleDisk 5.25

The AppleDisk 5.25" drive is a platinum single 5.25" drive. It is a DB-19 type drive that supports daisy chaining. It IS compatible with ALL APPLE computers that can use a 5.25" Apple II based drive. This drive is compatible, with the ROM 03 IIgs, the //c+ and the Macintosh LC //e emulator card.

This drive looks IDENTICAL to the Apple UniDisk 5.25" with the exception of the color of the case. BEWARE. The UniDisk 5.25" is NOT THE SAME AND WILL NOT WORK IN ALL CASES WHERE THE APPLEDISK 5.25" WILL WORK.

Interfacing Information

5.25 //c, IIgs, and IIc Plus, IIgs ROM 3, LC Slot //e Card use

Smartport drive information & why some 5.25" drives don't work.

The reason drives may not work with the IIgs ROM 03, IIc Plus or Macintosh LC //e emulator card is because around the introduction of the Apple IIc Plus, Apple changed the Smartport protocol to where each device hooked to it, (be it 5.25" drive, 3.5" drive or a Smartport compatible hard disk) needs an ID Byte. The Apple Disk ][, UniDisk 5.25", DuoDisk and most 3rd party drives DO NOT CONTAIN this needed ID Byte rendering such drives unusable with the newer Smartport protocol.

The 20 Pin Disk ][ when combined with a 19 pin adapter or replacement cable, can be used with a //c or IIgs ROM 00 or 01 via the Smart Port/Drive Port connector. When it is used with the //c it is assigned to Slot 6, Drive 2. When used with a IIgs it will be Slot 6, Drive 1 or 2 depending on the position it is connected on the Daisy Chain. The Disk ][ will generally not work with the IIc Plus or IIgs ROM 3 due to hardware changes in the drive detection on these models. The difference is due to the way Apple implemented the Write Protect circuit on their own disk drives. The Apple design integrates the Stepper Motor Phase 2 in the write protect status detection where as many third party drive manufactures used a simple ground to complete the circuit. Incompatible drives on these models will just spin at startup, the recalibration will not take place. However placing a disk into the drive enough to pass the Write Protect switch, or a write protected disk, before turning on the computer will allow the drive to boot. Thus it is possible to use incompatible third party drives with the IIc Plus or ROM 3 in a constant write protected state.

Daisy Chain explained

The term daisy chain is where each device in a system plugs into the previous device, thus eliminating the need for additional interfaces. Each device contains a connector to plug the next one in. On the back of the Apple UniDisk 5.25", AppleDisk 5.25", Apple UniDisk 5.25" and the AppleDisk 3.5" is a DB-19 Connector identical to the one that the drive is plugged into. In a drive chain on an Apple II Computer, ANY 3.5" device(s) must always come before any 5.25" device(s)

Other things that use daisy chaining on the Apple are SCSI hard disks and AppleTalk (LocalTalk) networking and Ethernet networking. Although Ethernet and AppleTalk to don't quite 'look' the same, it's still a daisy chain system.

1) A Modification may be necessary for the DuoDisk to work on a IIgs 2) As noted, certain IIc Plus+ units seem to work with any version of the 19 Pin 5.25 drive, and do not require the 'platinum drive' Additional IWM/technical information: http://www.stockly.com/forums/showthread.php?t=9

3.5" Drives:

Apple made two different 3.5" drives for the Apple II, the AppleDisk 3.5" and the UniDisk 3.5". The AppleDisk 3.5" is Apple Platinum colored and was introduced along with the Apple IIgs. It is compatible with the Apple IIgs, IIc Plus, //e Emulation Card, Apple SuperDrive Controller and Universal Disk Controller / Laser 128. It DOES NOT WORK WITH THE LIRON Controller.

Apple SuperDrive Controller

This is a 3.5" drive controller card made by Apple Computer that can be used with an Enhanced Apple //e or IIgs to use an Apple FDHD (1.44M) drive or other compatible high density drive. The initial shipments of the SuperDrive controller are/were titled the 'Apple 3.5" drive controller, this was renamed to the SuperDrive controller to avoid confusion with the earlier product

It will also work with any daisy-chainable 3.5" drive that is capable of plugging into the floppy port on the IIgs or Mac. Such drives are:

Drive Type
Manufacture
UniDisk 3.5 Apple Computer, Inc.
AppleDisk 3.5 Apple Computer, Inc.
ASA800K American Micro Research
800K Drive Applied Engineering
1.44M Drive Applied Engineering

Apple 3.5 Controller (aka the 'Liron' card)

The Liron card has an IWM (342-0041) chip in the middle of the card and is labeled "Liron" on the back side. This is the original 3.5" card, also known as the Apple SmartPort card, it is the //c SmartPort on a card and can control external SmartPort hard disks such as the ProAPP, Quark QC-10, Chinook/Squential Systems external //c Hard Drive.

Drive Type
Manufacture
UniDisk 3.5 Apple Computer, Inc.
ProAPP 10, 20, 40 ProAPP, Inc.
Quark QC-10 Quark, Inc.
Chinook CT-20, CT-40 Chinook, Inc.
CT-100 Sequential Systems

3.5" Floppy Drives

AppleDisk 3.5

This is an external Apple 800K DSDD 3.5" Drive. See the compatibility chart after the UniDisk 3.5" information for more detail.

Apple UniDisk 3.5"

This is an External Apple 800K DSDD 3.5". Compatibility with the following computers is as follows:

The UniDisk 3.5" can be used on the following Apple II Systems, and it's requirements are listed with it.

Apple ][, ][ Plus

 : Requires 64K, ProDOS and an Apple 3.5" drive controller.

Apple //e:

Requires an Apple 3.5" controller or Apple SuperDrive controller. The SuperDrive controller requires an Enhanced //e


Universal Disk Controller / Laser 128

The UniDisk 3.5" drive is NOT COMPATIBLE with the Laser Universal Disk Controller. It will do Bad Things when it's plugged in. Do Not Try It.


Apple //c:

Requires a ROM upgrade in older //c units to be installed if it's not already installed. If the model # on the //c is A2S4000 then it may not have the ROM installed. To find out, turn on the computer and from BASIC, (the ] prompt) type 'PR#7'. If the EXTERNAL 5.25" drive 'boots' then it needs the ROM upgrade. IF the computer says 'AppleTalk offline' it has the ROM installed. If no external drive is installed and no AppleTalk message appears you still need the newer ROM.


Another way is to turn on the computer, when you can see the monitor hold down both the Open and Closed Apple keys. (Opposite sides of the spacebar) and hit CTRL and RESET. If the computer goes into a checkerboard type pattern you have the new ROM installed. If the computer goes to an alternating vertical line pattern with a click between each alternation. (Turn up volume, on left side, under keyboard). You will need a ROM upgrade. The part # for this ROM upgrade is 342-0033.


Apple IIc Plus:

Nothing additional is required to use the UniDisk 3.5" with an \

Apple //c+.


Apple IIgs:

No additional hardware is required to use the UniDisk 3.5" with an Apple IIgs directly although you can use the UniDisk 3.5" with either an Apple 3.5" controller card or Apple SuperDrive controller in the slot of an Apple IIgs. The UniDisk normally plugs into the floppy port of the Apple IIgs.


Important Note: The UniDisk is not the recommended 3.5" drive for use with an Apple IIgs although it will work fine for normal usage. It will be slower than using the recommended drive, the AppleDisk 3.5". It looks similar to the UniDisk 3.5" and is the same color as the Apple IIgs itself. Using a UniDisk on a IIgs while using any GS specific software that runs under GS/OS will require that a device driver be installed on the boot volume as well. The driver, titled 'UniDisk.3.5' can be found on the system disk set and be installed using the installer on the System Tools disk of System Disk 5.0.4 or the Installer disk of System 6.0. Using the UniDisk on the IIgs will also be slower than using the proper 3.5" drive and some disk based software from such groups as the FTA may simply not run.


Apple //e Emulation Card:

No additional hardware is needed to use the UniDisk 3.5" with the Apple //e Emulation card. It simply plugs into the Floppy Port of the card, which is the larger plug on the two way cable supplied with the card.

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