36703
Initial C64 sales were nonetheless relatively slow due to a lack of software , reliability issues with early production models , particularly high failure rates of the PLA chip , which used a new production process , and a shortage of 1541 disk drives , which also suffered rather severe reliability issues .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None