Amiga External Floppy Adapter
Theory of operation
This board allow to connect all type of floppy drives to the Amiga external D-Sub 23 floppy connector;
- Original Amiga "Shugart" drive
- Gotek floppy drive emulator
- IBM-PC floppy drive (720K and 1.44M)
It can operate as DF1, DF2 or DF3, depending on the J4 jumper position. Two mode of operation are possible;
- Native "Shugart" mode can be selected with J1, J2 and J3 jumper between pin 1 and 2.
- IBM-PC mode can be selected with J1, J2 and J3 jumper between pin 2 and 3.
Onboard logic makes all drive to be seen as 880K standard Amiga floppy drives.
Schematic
This drawing has been sketch on OrCAD Capture CIS 10.5.0
PCB
Front
Back
This PCB has been sketch on WinTypon v8.3 Full compatible Gerber files included
You can buy a ready made version on my website: Retronic Design Store.
Bill of material
| Quantity | Designator | Part |
|---|---|---|
| 10 | R1,R2,R3,R4,R5,R6,R8,R9,R10,R11 | 2.2K 1% 0805 |
| 1 | C1 | 10uF 10% 1206 |
| 2 | C2,C3 | 0.1uF 10% 0805 |
| 1 | U1 | 74LVC1G74 SMD |
| 1 | U2 | 74LS38 SMD |
| 3 | J1,J2,J3 | Header 3x1 |
| 1 | J4 | Header 3x2 |
| 1 | CON1 | Header 17x2 |
| 1 | CON2 | D-SUB 23 Male |
| 1 | CON3 | Molex 4 Male |