On 12/22/2016 11:37 PM, Fred Cisin wrote:
NO source is completely reliable.
http://jeremyreimer.com/uploads/notes-on-sources.txt
He does provide some information on his sources.
When we talk about sales, are we talking about UNITS, or about dollars?
(an important distinction for such as the ZX80 V anything else!)
His curve fitting is flawed. For example, in his 1975 to 1981 graph,
he has points for sales of TRS-80 of ZERO in 1976, and LOTS in 1977.
But, then he just drew a straight line, which erroneously implies a
linear increase, with sales in 1976. THAT derivative should be a
vertical line, not a slope, unless/until you add more resolution for
months, instead of years, representing an extremely steep slope in the
end of 1977.
As someone that was on the front end of the TRS80 it went from Zero to
60 in '77 as the first deliveries were a batch of
1000 then 5000 to the stores. they sold very fast far faster than
expected. Indeed the first 12 months had a very steep
curve.
Most number and data I see to day in the popular media is just plain wrong.
Allison