WD 1793 (4,5,6,7 disk-controler Pinout), MB8877A is pin compatible.
| |
GND |
1 |
U
1793
disk
contr
|
40 |
? |
|
|
!RD |
2 |
39 |
!DDEN |
|
|
!FDCSC |
3 |
38 |
!DRQ |
<-- |
|
!RD |
4 |
37 |
? |
|
| ----> |
A0 |
5 |
36 |
W.P. |
<-- |
| ----> |
A1 |
6 |
35 |
IP |
<-- |
| <---> |
D0 |
7 |
34 |
Trk0 |
<-- |
| <---> |
D1 |
8 |
33 |
|
|
| <---> |
D2 |
9 |
32 |
RDY |
<-- |
| <---> |
D3 |
10 |
31 |
W.D. |
<-- |
| <---> |
D4 |
11 |
30 |
W.G. |
<-- |
| <---> |
D5 |
12 |
29 |
|
|
| <---> |
D6 |
13 |
28 |
HLD |
<-- |
| <---> |
D7 |
14 |
27 |
!RR |
<-- |
|
STEP |
15 |
26 |
RCLK |
|
| ----> |
DIR |
16 |
25 |
SS0 |
--> |
|
Early |
17 |
24 |
CLK |
|
|
Late |
18 |
23 |
HLT |
--> |
| ----> |
!HR |
19 |
22 |
A0 |
<-- |
|
|
20 |
21 |
|
|
|