IC-1 is the main processor chip on the Control Board of the TS-430.  It is a uPD8049c.  This 40 pin chip runs at 5.74 Mhz, and interfaces with virtually every control integrated circuit (IC-2 through IC-6) on the board.  You can see that it is central to the radio’s operation.

Digital Control System

8049c Pinout

IC-1 Functions

Pin 1: Data Selector Input – Receives button/switch status from IC-4 and IC-5.

Pin 1: T0

Pins 2 & 3: Clock input – 5.74 MHz crystal oscillator

Pin 2: XTAL 1

 

Pin 3: XTAL 2

 

Pin 4: RESET

RESET (Low to reset)

 

Pin 5 – Single Step – enables single stepping through program. Not used. Tied High.

Pin 5: SS

 

Pin 6: INT – Interrupt Pin. Makes processor jump to a display update routine periodically, then return.

Pin 6: Interrupt

 

Pin 7: EA – External Access – Not Used. Tied to ground.

Pin 7: EA

 

Pin 8: RD – Read Data Bus – Not Used.

Pin 8: RD

Pin 9: PSEN – Program Store Enable Output. Not Used.

Pin 9: PSEN

 

Pin 10: WR – Bus Write – Not Used.

Pin 10: WR

 

Pin 11: ALE – Address Latch Enable output for external data or memory. Not used.

Pin 11: ALE

 

Pins 12 – 19: Bidirectional Data Bus. Used to exchange Mode Data with RAM and control circuits.

Pin 12: B0 – VFO “A” Indicator output

Pin 12: DB0

 

Pin 13: DB1 – VFO “B” Indicator output

Pin 13: DB1

 

Pin 14: DB2 – No memory signal output.

Pin 14: DB2

 

Pin 15: DB3 – MODE Output LSB

Pin 15: DB3

 

Pin 16: DB4 – MODE Output USB

PIN 16: DB4

 

Pin 17: DB5 – MODE Output CW

Pin 17: DB5

 

Pin 18: DB6 – MODE Output AM

Pin 18: DB6

 

Pin 19: DB7 – MODE Output FM

Pin 18: DB7

 

Pin 20: Ground

Pin 20: GND

 

Pins 21-25: I/O Expander Control Output

 

Pin 21: P20 – Port 2 Bit 0

Pin 21: P20

 

Pin 22: P21 Port 2 Bit 1

Pin 22: P21

 

Pin 23: P22 – Port 2 Bit 2

Pin 23: P22

 

Pin 24: P23 – Port 2 Bit 3

Pin 24: P23

 

Pin 25: PROG – Clocks Instructions & Data to I/O Expander Chips IC-2 & IC-3.

Pin 25: PROG

 

Pin 26: Vdd +5 volts

Pin 26: Vdd

 

Pin 27: P10 – Port 1 Bit 0 – TX Inhibit (Out of ham band)

Pin 27: P10

 

Pin 28: P11 – Port 1 Bit 1 – Tx Inhibit – Out of ham & WARC Band

Pin 28: P11

 

Pin 29: P12 – Pin 1 Bit 2 – 28 MHz Power Down Output

Pin 29: P12

 

Pin 30: P13 – Port 1 Bit 3 – External Ram Control Output R/W to IC-6 Static Ram

Pin 30: P13

 

Pin 31: P14 – Port 1 Bit 4 – P.SCAN Input

Pin 31: P14

 

Pin 32: P15 – Port 1 Bit 5 – M.SCAN Input

Pin 32: P15

 

Pin 33: P16 – Port 1 Bit 6 – FUNCTION Input

Pin 33: P16

 

Pin 34: P17 – FUNCTION input M.CHAN Input

Pin 34: P17

 

Pin 35: P24 – Port 2 Bit 4 – O/O Expander data selector control output

Pin 35: P24

 

Pin 36: Port 2 Bit 5 – External RAM Control Output (CE) for IC-6

Pin 36: P25

 

Pin 37: P26 – Port 2 Bit 6 – Encoder Up/Down Input

Pin 37: P26

 

Pin 38: P27 – Port 2 Bit 7 – Voltage Down detection signal

Pin 38: P27

 

Pin 39: T1 – Encoder Clock, P.SCAN clock input

Pin 39: T1

 

Pin 40: VCC + 5 volts

Pin 40: Vcc