Most portable adapters follow a standard layout. If you have a small PCB that converts the 20-pin IDC to an 8-pin SOIC clip, here is the you need to verify:
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| iProg 20-Pin Header Pin | Function | SOIC8 Chip Pin | EEPROM Signal | | :--- | :--- | :--- | :--- | | 1 | Vcc (5V / 3.3V) | 8 | Power | | 2 | Vpp (Programming Voltage) | Not used | Usually left open | | 3 | NC | - | - | | 4 | GND | 4 | Ground | | 5 | CS (Chip Select) | 1 | CS | | 6 | SCK (Clock) | 2 | CLK | | 7 | SI (Data In) | 5 | DI / MOSI | | 8 | SO (Data Out) | 2 (Wait, conflict?) | Correction below | Most portable adapters follow a standard layout