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TS-430 Control Board: IC-3 Waveforms

 

TS-430 Control Board: IC-3 Waveforms

Filed in TS-430 on Dec.11, 2018

IC-3 on the control board is an I/O expander chip.  It is a uPD8243c.  This chip is directly compatible with the 8049 processor, and uses instructions received from the processor on pins 8-11 to control 4 output ports. These 4 ports control the PLL Oscillators, and interface with the two data selector chips (IC-4 and IC-5) as well as the static RAM chip IC-6. It also provides BAND data to the RF board for control of filters.

 

 
8243 Pinout

8243c_Datasheet 

 

 
IC-2 Pinout Functions

Pin 1: Data Selector & Ram I/O Bit 0

 

 
Pin 1: Data Selector & Ram I/O Bit 0

Pin 2: Band Data Bit 0

 
Pin 2: Band Data Bit 0

Pin 3: Band Data Bit 1

 
Pin 3: Band Data Bit 1

Pin 4: Band Data Bit 2

 
Pin 4: Band Data Bit 2

Pin 5: Band Data Bit 3

 
Pin 5: Band Data Bit 3

Pin 6: Chip Select

 
Pin 6: Chip Select

Pin 7: PROG

 
Pin 7: PROG

Pin 8: Control I/O Pin 3

 
Pin 8: Control I/O Pin 3

Pin 9: Control I/O Pin 2

 
Pin 9: Control I/O Pin 2

Pin 10: Control I/O Pin 1

 
Pin 10: Control I/O Pin 1

Pin 11: Control I/O Pin 0

 
Pin 11: Control I/O Pin 0

Pin 12: Ground

 
Pin 12: Ground

Pin 13: Port 7 PLL Control Bit 0

 
Pin 13: Port 7 PLL Control Bit 0

Pin 14: Port 7 PLL Control Bit 1

 
Pin 14: Port 7 PLL Control Bit 1

Pin 15: Port 7 PLL Control Bit 2

 
Pin 15: Port 7 PLL Control Bit 2

Pin 16: Port 7 PLL Control Bit 3

 
Pin 16: Port 7 PLL Control Bit 3

Pin 17: Port 6 PLL Control Bit 3

 
Pin 17: Port 6 PLL Control Bit 3

Pin 18: Port 6 PLL Control Bit 2

 
Pin 18: Port 6 PLL Control Bit 2

Pin 19: Port 6 PLL Control Bit 1

 
Pin 19: Port 6 PLL Control Bit 1

Pin 20: Port 6 PLL Control Bit 0

 
Pin 20: Port 6 PLL Control Bit 0

Pin 21: Data Selector & Ram I/O Bit 3

 
Pin 21: Data Selector & Ram I/O Bit 3

Pin 22: Data Selector & Ram I/O Bit 2

 
Pin 22: Data Selector & Ram I/O Bit 2

Pin 23: Data Selector & Ram I/O Bit 1

 
Pin 23: Data Selector & Ram I/O Bit 1

Pin 24: Vcc +5 volts

 
Pin 24: Vcc +5 volts


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