Home  Back
Last update: 6 February 2004

IC number:µPD765
IC function:FDC (Floppy Disk Controller)
Related components:37C65, FDC9268 (FDCs), WD1691 (data separator)

Component documentation
IC numberManufacturerDocumentation
µPD765ANECNot available

Component versions
ComponentPackageSpeedCBM part numberCBM part description
µPD765AC-240-Pin Plastic DIP8 MHz380206-01IC LSI FDC UPD765

Positions
DevicePositionPackageSpeed
A1060 main boardU31DIP8 MHz
PC-10 combined boardU64DIP8 MHz
PC-10 I/O-boardU12DIP

Pinout
PinTypeNameDescription
1InputRESET_Reset input
2InputRD_Read control input
3InputWR_Write control input
4InputCS_Chip select input
5InputA0Data or status select input
6..13I/ODB0..DB7Bidirectional data bus
14OutputDRQDMA request output
15InputDACK_DMA acknowledge input
16InputTCTerminal count input
17InputINDEXIndex input
18OutputINTInterrupt request output
19InputCLKClock input
20PowerGNDGround
21InputWCLKWrite clock input
22InputWINDOWRead data window input
23InputRDATARead data input
24InputSYNCVCO sync output
25InputWEWrite enable output
26OutputMFMMFM output
27OutputSIDEHead select output
28..29OutputUS1..US0FDD unit select output
30OutputWDATAWrite data output
31..32OutputPS1..PS0Preshift output
33InputFLT/TRK0Fault / track 0 input
34InputWPRT/2SIDEWrite protect / two side input
35InputREADYReady input
36OutputHOLDHold load output
37OutputFLTR/STEPFault reset / step output
38OutputLCT/DIRLow current / direction output
39OutputRW_/SEEKRead/write / seek output
40PowerVCCDC power (+5V)

Copyright © 2004 Ronald van Dijk - All rights reserved