425 SX/T (259-7700) Pinouts Faxback Doc. # 2270 RS-232 Serial Port: Keyboard/Mouse Port: 1. Carrier Detect 1. Data 4. +5 VDC 2. Receive Data 2. Reserved 5. Clock 3. Transmit Data 3. Ground 6. Reserved 4. Data Terminal Ready 5. Signal Ground 6. Data Set Ready 7. Request to Send 8. Clear to Send 9. Ring Indicator Parallel I/O Port: 1. Strobe * 14. Auto Feed * 2. Data Bit 0 15. Error * 3. Data Bit 1 16. Initialize * 4. Data Bit 2 17. Select In 5. Data Bit 3 18. Ground 6. Data Bit 4 19. Ground 7. Data Bit 5 20. Ground 8. Data Bit 6 21. Ground 9. Data Bit 7 22. Ground 10. Acknowledge * 23. Ground 11. Busy 24. Ground 12. Paper End 25. Ground 13. Select * = Active Low Signal Video Port: 1. Red Video 2. Green Video 3. Blue Video 4. Monitor ID Bit 2 (not used) 5. Ground 6. Red Return (ground) 7. Green Return (ground) 8. Blue Return (ground) 9. Key (no pin) 10. Sync Return (ground) 11. Monitor ID Bit 0 (ground) 12. Monitor ID Bit 1 (ground) 13. Horizontal Sync 14. Vertical Sync 15. Not Used (diagnostic) (rjs-05/21/93)