Here are the numbers that Jeremy Reimer has for thousands of units sold in 1978[0]: TRS-80: 150 Commodore Pet: 30 Apple II: 7.6

Here are the numbers that Jeremy Reimer has for thousands of units sold in 1978[0]: TRS-80: 150 Commodore Pet: 30 Apple II: 7.6 Altair: 4 Others: 100 It lists a total of 258 thousand, which seems to omit Apples and Altairs. His 2005 article[1] talked about 4000 Pets sold in 1978 (the number you gave as well), which is an order of magnitude less. [0] https://jeremyreimer.com/rockets-item.lsp?p=137 https://jeremyreimer.com/rockets-item.lsp?p=137 [1] https://arstechnica.com/features/2005/12/total-share/3/ https://arstechnica.com/features/2005/12/total-share/3/