Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== SD_SETMD/IOW_SOVA ====== This trap sets the character writing or plotting mode. ^Call Parameters^^Return Parameters^^ |D0.B|$2C|D0.L|Error code.| |D1.W|Mode |D1.L|Corrupted.| |D3.W|Timeout. |D3.L|Preserved.| |A0.L|Channel ID. |A0.L|Preserved.| |A1.L| |A1.L|Corrupted.| ===== Errors ===== |ERR_NC|Not complete.| |ERR_NO|Channel not open.| ===== Notes ===== * All registers not shown above are not used on entry and are preserved on exit. * The mode given in D1 is: * -1 ink XORed into the background. * 0 character background is strip colour; plotting is in ink colour. * 1 character background is transparent so it is not overwritten; plotting is in ink colour. ===== Example ===== The example below shows how to use this trap call to make printing appear and then disappear. The mode is set to -1 then printing can be done. After a wait the printing is again done and it now disappears. It is assumed that A0 contains the channel ID. <code> Setmd moveq #-1,d1 ; Set XOR mode. moveq #-1,d3 ; Timeout. moveq #SD_SETMD,d0 ; $2C trap #3 ; Set the mode tst.l d0 ; OK? . . bne error ----> ; . . no! bsr print ; Print something at 0,0 bsr wait ; Wait for a bit. bsr print ; The printing disappears. </code> qdosmsq/traps/trap_3/sova.txt Last modified: 2009/03/02 17:20by george.gwilt