=====Inserting characters into the keyboard buffer=====

//by Richard Russell, July 2006//\\ \\  On the //BBC Microcomputer// and some other Acorn computers you could insert a character into the keyboard buffer using the ***FX 138** command. For example the following code would insert the character "R" (CHR$82) into the keyboard buffer:

<code>
      *FX138,0,82
</code>

//BBC BASIC for Windows// doesn't have a directly equivalent command, but you can achieve the same effect using the following procedure:

<code bb4w>
      DEF PROCfx138(C%)
      WM_CHAR = 258
      SYS "PostMessage", @hwnd%, WM_CHAR, C%, 0
      ENDPROC
</code>

The equivalent procedure for //BBC BASIC for SDL 2.0// is as follows:

<code bb4w>
      DEF PROCfx138(C%)
      LOCAL ev{} : DIM ev{type%,stamp%,winid%,text&(1)}
      ev.type% = &303 : ev.text&(0) = C% : SYS "SDL_PushEvent", ev{}
      ENDPROC
</code>        
        
So to insert the character "R" into the keyboard buffer you would do:

<code bb4w>
      PROCfx138(82)
</code>

or, equivalently,

<code bb4w>
      PROCfx138(ASC("R"))
</code>