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1. Remove CPU: 8th/9th Generation Intel Xeon
2. Remove USB: 1 x USB 2.0 (on board)
3. Remove Serial Port: 1 x RS-232

CPU

1. 8th/9th Generation Intel Xeon

USB

1. 1 x USB 2.0 (on board)
2. 1 x USB 3.0 (+1)
3. 4 x USB 2.0 (+1)
4. 5 x USB 3.0 (on board) (+1)

Serial Port

1. 1 x RS-232
2. 2 x RS-232 (on board) (+2)
3. 2 x RS-232/422/485 (+2)