Passage: IBM introduced a smaller, more affordable computer in 1954 that proved very popular. The IBM 650 weighed over 900 kg, the attached power supply weighed around 1350 kg and both were held in separate cabinets of roughly 1.5 meters by 0.9 meters by 1.8 meters. It cost US$500,000 ($4.66 million as of 2019) or could be leased for US$3,500 a month ($30 thousand as of 2019). Its drum memory was originally 2,000 ten-digit words, later expanded to 4,000 words.  Memory limitations such as this were to dominate programming for decades afterward.  The program instructions were fetched from the spinning drum as the code ran.  Efficient execution using drum memory was provided by a combination of hardware architecture: the instruction format included the address of the next instruction; and software: the Symbolic Optimal Assembly Program, SOAP, assigned instructions to the optimal addresses (to the extent possible by static analysis of the source program). Thus many instructions were, when needed, located in the next row of the drum to be read and additional wait time for drum rotation was not required.

Question: what is the weight of the IBM 650?
The IBM 650 weighed over 900 kg