Editing Psion Series 7 (section)

== ROM builds ==

Two EPOC builds are commonly seen. '''Build 754''' shipped first and suffers a documented fault in which the machine gradually slows until it is soft reset, and a touchscreen that drifts out of calibration and cannot be corrected from the control panel. '''Build 756''', from early 2000, fixes both.<ref name="faqbugs">[https://www.oocities.org/epoc_32/bugs.html "Psion Series 7 FAQ: Known issues & bugs"], oocities.org/epoc_32. Source for the build 754 slowdown, the touchscreen calibration bug and its fix in build 756, the battery-catch microswitch fault, the CompactFlash drawer play, the PC Card modem current problem and the Add/Remove control panel crash.</ref>

Because the Series 7's operating system is in the machine and Psion never released an update for it, '''Series 7 owners could not fix the touchscreen bug in software''' — netBook owners simply loaded a newer OS image. The ROM board does contain Flash devices, so an update was technically possible; Psion made clear it would never happen.<ref name="faqbugs" />