Editing Amstrad PPC640 (section)

=== Display ===
The internal display adapter emulates both the MDA and the CGA, and drives either the internal LCD or an external monitor through a 9-pin D socket carrying RGBI colour, mono video and the two sync signals.<ref name="trm" /> The LCD is a 640 × 200 supertwist panel with adjustable contrast and grey-scale emulation; it tilts on its own hinge and folds into a recess in the top of the case.<ref name="ppcsm" /><ref name="wpppc" /> With Scroll Lock on, the right-hand Alt (Gr) key switches between two ways of rendering colour on the LCD, and the right-hand Ctrl key switches output between the LCD and an external monitor.<ref name="ppcui">Amstrad plc, ''The Amstrad Portable PPC 512/640 User Instructions'' (US edition, first edition 1988). Hosted as [[:File:Amstrad PPC 512 PPC 640 User Instructions.pdf]], described at [[Amstrad PPC 512 / PPC 640 User Instructions]]. Power sources (introduction); inserting the batteries p. 9; configuration switches pp. 10–11; switching on pp. 13–14; LCD toggles p. 17; switching off p. 43; cleaning p. 50; external monitor pp. 317–318; troubleshooting pp. 327–339; PC2000 modem p. 236.</ref> Amstrad treated the LCD as a complete exchange unit (LCD101, part 177245) and gave no service data for it.<ref name="ppcsm" />