try this link:
https://www.freedomscientific.com/Content/Documents/Manuals/Focus/Focus40Blue/Focus-40-Blue-Online-Users-Guide.htm
Legend has it that on Saturday 4/28/2018 02:33 PM, leonard morris said:
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I have an older Focus 40 blue display. It was
not displaying cells correctly so I did not use
it for about five years. But as a last resort I
took it to a PC store and they cleaned the dust
out. While it isn't perfect it is very much
more useable. in fact I'm typing this email
using it right now. I can not find my manual but
I want to know the keys to press to perform a
test pattern for the cells? Also, it looks like
the firmware for the display is 4.44. How can I
check to see if there is a firmware update? --
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