Carmack: Over the entire course of Doom and Quake 1’s development we probably spent $100,000 on NeXT computers https://www.forbes.com/sites/quora/2016/09/01/

Carmack: Over the entire course of Doom and Quake 1’s development we probably spent $100,000 on NeXT computers https://www.forbes.com/sites/quora/2016/09/01/why-john-carmack-chose-next-for-developing-doom-and-other-favorites/#1c6643e314d1 https://www.forbes.com/sites/quora/2016/09/01/why-john-carma...