48057
Together with Control Data Corporation ( the hard drive manufacturer ) and Compaq Computer ( the initial customer ) , they developed the connector , the signaling protocols and so on , with the goal of remaining software compatible with the existing ST-506 hard drive interface .
 Control Data Corporation, Compaq Computer, ST-506
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Control Data Corporation, Compaq Computer, ST-506