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StephenG1CMZ · (This post was last modified: 04-29-2017 05:57 PM by StephenG1CMZ.)

It is 35 years this month since the Spectrum was launched.
When I heard of an earlier remake, I had a look to see how it might fit on the HP Prime's screen.
http://www.hpmuseum.org/forum/thread-7611.html
In the specs I have seen, the number of lines varies - I am not aware of any specific upgrade associated with the change, so perhaps it just varies according to whether the documentation assumes you are using NTSC or PAL?