VT420 Programmer Reference Manual

1 VT420 Programmer Reference Manual Order Number EK VT420 Digital Equipment Corporation First edition , November 1989. second edition , February 1992. The information in this document is subject to change without notice and should not be construed as a commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility for any errors that may appear in this document. The software described in this document is furnished under a license and may be used or copied only in accordance with the terms of such license. No responsibility is assumed for the use or reliability of software on equipment that is not supplied by Digital Equipment Corporation or its affiliated companies. Restricted Rights: Use, duplication, or disclosure by the U.

2 S. Government is subject to restrictions as set forth in subparagraph ( c ) ( 1 ) ( ii ) of the Rights in Technical Data and Computer Software clause at DFARS 7013. Copyright Digital Equipment Corporation 1989, 1992. All Rights Reserved. Printed in The following are trademarks of Digital Equipment Corporation: DEC, DEClaser, DECnet, DECserver, LA, LA50, LA75 Companion, LA324, LN01, LN03, LQP02, Scholar, SSU, VMS, VT, VT52, VT100, VT220, VT320, and VT420 . AT&T is a registered trademark of American Telephone and Telegraph Company. IBM is a registered trademark of International Business Machines Corporation. This document was prepared and published by Educational Services Development and Publishing, Digital Equipment Corporation.

3 Contents About This Manual xvii Part 1 Introduction to Your VT420 Terminal 1 VT420 Features VT420 Models .. 3. Keyboards .. 4. New Features .. 6. PC TERM Mode .. 6. Two Sessions .. 6. User Windows .. 7. Page Memory .. 7. Macro Feature .. 8. Rectangular Area Operations .. 8. Local Copy and Paste Feature (VT Mode) .. 8. Number of Lines/Screen .. 8. General Features .. 9. Set-Up .. 9. Display Features .. 9. Text Features .. 9. Character Sets .. 10. Communication Features .. 11. Operating Modes .. 12. iii iv Contents 2 Character Encoding Overview .. 13. Coding Standards .. 14. Characters and Character Sets .. 16. Code Table .. 16. 7-Bit ASCII Code Table .. 17. 8-Bit Code Table .. 20. VT420 Character Sets .. 23. DEC Supplemental Graphic Character Set.

4 24. ISO Latin Alphabet Nr 1 Supplemental Character Set .. 26. National Replacement Character Sets (NRC Sets). (Worldwide Models Only) .. 27. DEC Special Graphic Character Set .. 29. DEC Technical Character Set .. 30. Downloaded (Soft) Character Set .. 31. Control Characters .. 31. Control Functions .. 36. Sequence Format .. 37. Escape Sequences .. 38. Control Sequences .. 38. Numeric Parameters .. 39. Selective Parameters .. 40. Device Control Strings .. 40. Using Control Characters in Sequences .. 41. 7-Bit Code Extension Technique .. 42. Working with 7-Bit and 8-Bit Environments .. 43. Conventions for Codes Received by the Terminal .. 43. Conventions for Codes Sent by the Terminal .. 43. Using Macros .. 44. Define Macro (DECDMAC).

5 44. Invoke Macro (DECINVM) .. 47. Display Controls Mode .. 48. Contents v Part 2 Control Functions Sent to the Host 3 ANSI, Short ANSI, and PC Keyboard Codes Keyboard Layouts .. 58. Main Keypad .. 60. Standard Keys .. 60. Special-Function Keys (ANSI Keyboard) .. 62. Special-Function Keys (Short ANSI Keyboard) .. 63. Special-Function Keys (PC Keyboard) .. 63. Editing Keypad .. 64. Numeric Keypad .. 66. Top-Row Function Keys .. 73. 7-Bit Control Characters .. 78. Special Cases .. 79. Turning Autorepeat On and Off .. 79. Unlocking the Keyboard .. 80. Part 3 Control Functions Received from the Host 4 Emulating VT Series Terminals Level 1 (VT100 Mode) .. 83. Level 4 (VT400 Mode) .. 84. All Levels .. 84. Selecting an Operating Level (DECSCL).

6 87. Sending C1 Controls to the Host .. 88. National Replacement Character Set Mode (DECNRCM) .. 89. vi Contents 5 Using Character Sets Selecting Character Sets .. 91. Designating Character Sets (SCS Sequences) .. 93. Mapping Character Sets .. 95. Locking Shifts (LS) .. 98. Single Shifts (SS) .. 99. National Replacement Character Sets (Worldwide Model Only) .. 100. Assigning User-Preferred Supplemental Sets (DECAUPSS) .. 100. ANSI Conformance Levels .. 101. Soft Character Sets .. 102. Designing a Soft Character Set .. 103. Coding the Soft Character Set .. 107. Downloading Soft Characters .. 113. Downline Load (DECDLD) .. 114. Designating the Soft Character Set .. 122. Soft Character Set Example .. 123. Clearing a Soft Character Set.

7 125. 6 Page Memory What is Page Memory? .. 126. Page Memory for One Session .. 127. Page Memory for Two Sessions .. 129. Controlling the Page Format .. 130. Selecting 80 or 132 Columns per Page .. 130. Set Lines per Page (DECSLPP) .. 132. Set Left and Right Margins (DECSLRM) .. 133. Set Top and Bottom Margins (DECSTBM) .. 134. Origin Mode (DECOM) .. 135. Vertical Split Screen Mode (DECVSSM) .. 135. Moving to Another Page .. 136. Next Page (NP) .. 136. Preceding Page (PP) .. 137. Page Position Absolute (PPA) .. 138. Page Position Backward (PPB) .. 138. Page Position Relative (PPR) .. 139. Contents vii Summary .. 140. 7 Setting Visual Character and Line Attributes Setting Visual Character Attributes .. 142. Select Graphic Rendition (SGR).

8 143. Setting Line Attributes .. 144. Single-Width, Single-Height Line (DECSWL) .. 144. Double-Width, Single-Height Line (DECDWL) .. 145. Double-Width, Double-Height Line (DECDHL) .. 145. Summary .. 147. 8 Editing Inserting and Deleting Columns, Lines, and Characters .. 148. Insert/Replace Mode (IRM) .. 149. Delete Column (DECDC) .. 149. Insert Column (DECIC) .. 150. Delete Line (DL) .. 150. Insert Line (IL) .. 151. Delete Character (DCH) .. 152. Insert Character (ICH) .. 152. Erasing Text .. 153. Erase in Display (ED) .. 153. Erase in Line (EL) .. 154. Erase Character (ECH) .. 154. Selectively Erasing Text .. 155. Select Character Protection Attribute (DECSCA) .. 155. Selective Erase in Display (DECSED) .. 156. Selective Erase in Line (DECSEL).

9 157. Summary .. 158. viii Contents 9 Rectangular Area Operations Copying, Filling, and Erasing Rectangular Areas .. 160. Copy Rectangular Area (DECCRA) .. 161. Fill Rectangular Area (DECFRA) .. 162. Erase Rectangular Area (DECERA) .. 164. Selective Erase Rectangular Area (DECSERA) .. 165. Changing Attributes of Rectangles .. 166. Select Attribute Change Extent (DECSACE) .. 166. Change Attributes in Rectangular Area (DECCARA) .. 167. Reverse Attributes in Rectangular Area (DECRARA) .. 169. Summary .. 172. 10 Cursor Movement and Panning The Cursor .. 176. Text Cursor Enable Mode (DECTCEM) .. 176. Moving the Cursor on the Current Page .. 176. Back Index (DECBI) .. 177. Forward Index (DECFI) .. 177. Cursor Position (CUP).

10 178. Horizontal and Vertical Position (HVP) .. 178. Cursor Forward (CUF) .. 179. Cursor Backward (CUB) .. 179. Cursor Up (CUU) .. 180. Cursor Down (CUD) .. 180. Panning .. 181. Pan Down (SU) .. 181. Pan Up (SD) .. 182. Cursor Coupling .. 183. Vertical Cursor-Coupling Mode (DECVCCM) .. 183. Page Cursor-Coupling Mode (DECPCCM) .. 184. Summary .. 185. Contents ix 11 Keyboard, Printing, and Display Commands Keyboard Control Functions .. 187. Keyboard Action Mode (KAM) .. 188. Backarrow Key Mode (DECBKM) .. 188. Line Feed/New Line Mode (LNM) .. 189. Autorepeat Mode (DECARM) .. 190. Autowrap Mode (DECAWM) .. 191. Cursor Keys Mode (DECCKM) .. 192. Numeric Keypad .. 192. Keypad Application and Numeric Modes (DECKPAM and DECKPNM).