Pin assignment of internal ports
Floppy interface
1
Pin | Signal | Pin | Signal |
1 | GND | 18 | Step DIR (low asserted) |
2 | FDHDIN (low asserted) | 19 | GND |
3 | GND | 20 | Step Pulse (low asserted) |
4 | not connected | 21 | GND |
5 | Key | 22 | Write Data (low asserted) |
6 | not connected | 23 | GND |
7 | GND | 24 | Write Enable (low asserted) |
8 | Index (low asserted) | 25 | GND |
9 | GND | 26 | Track 0 (low asserted) |
10 | Motor A Enable (low | 27 | GND |
| asserted) |
|
|
11 | GND | 28 | Write Protect (low asserted) |
12 | Drive B Select (low | 29 | GND |
| asserted) |
|
|
13 | GND | 30 | Read Data (low asserted) |
14 | Drive A Select (low | 31 | GND |
| asserted) |
|
|
15 | GND | 32 | Side 1 Select (low |
|
|
| asserted) |
16 | Motor B Enable (low | 33 | GND |
| asserted) |
|
|
17 | GND | 34 | Disk Change (low asserted) |
D1859 (Econel 50) | 13 |
