ΜPD765A

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μPD765A/B

The μPD765A/B (NEC) or Z0765A (Zilog) is Floppy Disk Controller (FDC) IC. It used in ZX Spectrum +2A/2B, +3/3B.

Pinout:

RESET <
RD <
WR <
CS <
D/S <
D0 <
D1 <
D2 <
D3 <
D4 <
D5 <
D6 <
D7 <
DRQ <
DAQ <
TC <
IDX <
INT <
CLK <
(0V) GND <

1 °       40
2         39
3         38
4         37
5         36
6         35
7         34
8         33
9         32
10        31
11        30
12        29
13        28
14        27
15        26
16        25
17        24
18        23
19        22
20        21

> VCC (+5V)
> RW/SEEK
> LCT/DIR
> FR/STP
> HDL
> RDY
> WP/TS
> FLT/TR0
> PS0
> PS1
> WDA
> US0
> US1
> HD
> MFM
> WE
> VCO/SYNC
> RDD
> RDW
> WCK