AMIGA EXTERNAL DOUBLE FLOPPY DISK DRIVE ADAPTER

Amiga External Double Floppy Disk Drive Adapter is for externally connecting two 1.44MB PC Floppy disk drives to your Amiga simultaneously, as DF:1 and DF:2. (from Amiga 23 pin disk drive connection).

Hello,

This is a tested and working circuit. This adapter has been tested on Commodore Amiga 500 with 1.44MB PC Floppy disk drives.

Amiga External Double Floppy Disk Drive adapter is an easy DIY project, all components are through hole and marked on the PCB, easy to solder, easy to make ;)

This adapter helps you to connnect; two 1.44MB PC Floppy disk drives to your Amiga at the same time as DF:1 and DF:2 (externally from Amiga 23 pin disk drive connection).

Ps. While using with Kickstart ROM V1.2 and V1.3 you may need AMIGA 500 - SWITCHLESS BOOT SELECTOR to boot from external drive.

Ps. Most Floppy disks may deteriorate over time by losing their magnetic properties, so you may frequently see read-write errors. Unfortunately, this is normal and has nothing to do with the operation of this circuit.

When using 1.44MB 3.5" Floppy Disk Drives, the HD holes at the corners of High Density floppy disks need to be covered with a piece of tape (for using them as Double Density Disks.)

Short J1 if 12 Volts required (for some old model FDD)

Many thanks to Roman Breński for this project.

http://romanworkshop.blutu.pl/

Schematics

http://romanworkshop.blutu.pl/elec/amiextfdd2.htm

If you need Amiga external SINGLE FDD Adapter PCB, it is here:

https://www.pcbway.com/project/shareproject/AMIGA_EXTERNAL_FLOPPY_DISK_DRIVE_ADAPTER_bfe5cc33.html

Components:

5pcs. 2.2K ohm 1/4 watt resistance

2pcs. 100 nF ceramic capacitor

74LS74 DIP14

74LS38 DIP14   

2pcs. DIP 14 IC socket

DB23M D-Sub 23 pin male connector **

2pcs. 2x17 (34) pin, 2.54mm Pitch, Male, PCB type, straight, IDC box header connector.

1pcs. 2pin, 2.54mm Pitch, Male header. (J1)

2pcs. 4pin, 2.54mm Pitch, Male header. (for FDD Power)

1pcs. 2.54mm Pitch Jumper Cap. (for J1, if 12 V required for drives)

2pcs. 34 pin (2x17) IDC Female to Female ribon cable (max 60cm) (Amiga FDD data cable)

2pcs. 4 pin 2.54mm Pitch Female to Female Header Dupond cable (max 60cm) (FDD Power cable)

This PCB

** There are several methods to obtain 23 pin D-sub male connector:

25 pin D-sub male connector's pins and the 3D model link below.

https://www.thingiverse.com/thing:1238286

Or you may chose this method.

https://archive.org/download/db23m/DB23M.jpg

Or you can buy online.

https://www.aliexpress.com/item/1005007020706331.html

Ps. While transfering data (reading or writing) from SD cards or USB flash storages it should not be interrupted like power-off or Reset systems. Otherwise that may damage memory chips.

In order to protect your electronical devices, always turn off your Amiga before connecting or disconnecting the cables or any other device.

Gerber files and component list are subject to change without notice. Before paying for the PCBs, be sure to update your orders!

As you can see I have uploaded many projects and I am still working on new projects. If you have any questions, please look for answers online. Unless I specify explicitly, all my projects are tested and confirmed to work under normal circumstances before being shared. I'm sorry I didn't have enough time to answer all the questions.

Use this PCB at your own risk !

Have fun

Thank you.

c64istanbul