Editing Psion Series 3c (section)

== What changed from the 3a ==

{| class="wikitable styled-table" style="width:70%; text-align:left;"
|+'''Series 3a → Series 3c'''<ref name="wp3" /><ref name="spec">[https://www.psion.netogram.com/psionspecifications.html "Psion specifications"], netogram.com. Source for the comparative specifications including serial speed, ROM and RAM sizes, keyboard button counts and backlight availability.</ref>
! Change !! Detail
|-
| '''Infrared port''' || Added, and visible on the case
|-
| '''Serial port''' || '''Changed''' — the 3c uses the same arrangement as the [[Psion Siena|Siena]], and a serial cable for direct connection to a Windows PC was supplied. '''Travel Modem connections differ between 3/3a and 3c/3mx.'''
|-
| '''Serial speed''' || Raised to 56,400 bit/s
|-
| '''Case''' || Redesigned: badge moved centrally on the lid, fewer undulations, '''matte dark grey painted finish'''
|-
| '''Backlight''' || Fitted to later models — mainly, though not only, the US 2 MB machines
|-
| '''RAM''' || 1 MB or 2 MB only
|-
| '''Application buttons''' || '''9''' reprogrammable buttons, against the 3a's 8
|-
| '''Expansion''' || Two internal SSDs plus an external PC-Card option
|-
| '''Software''' || Several modifications to the built-in applications
|}

Everything else — the '''V30H at 7.68 MHz inside ASIC9''', the 480 × 160 screen with its grey plane, the microphone and 12-bit sound recording, the 58-key keyboard, 2 × AA cells and the '''CR1620''' backup cell — is as the 3a.<ref name="spec" /><ref name="wp3" />

For the architecture itself — ASIC9, the bank-switched memory, the hardware 32-bit RTC, the power states and the supply rails — see [[Psion Series 3a]].