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???
02/26/04 15:15
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#65535 - RE: ascii arrow
Responding to: ???'s previous message
I forgot to add that the standard ASCII code set does not actually provide for a set of arrow codes.

There are some defactor standards that have come into standard usage. For example a commom set of keys used by older 24x80 Glass TTYs (RS232 terminals) to move the cursor around were Ctrl-H, Ctrl-J, Ctrl-K, and Ctrl-L.

Other software usage that came into play was the old 8-bit CP/M days where MicroStar International used the now famous cursor diamond of Ctl-A, Ctl-S, Ctl-W, and Ctl-X to move the cursor around.

From a display standpoint the font set of the popular HD44780 LCD display controller often has a set of arrow symbols encoded into its font table. Look in the data sheet here...

http://www.eece.ksu.edu/~lenhert/631/HD44780.pdf

... but of course the presence of the arrow symbols varies according to the version of the part and the code set table it contains.

From a PC standpoint the IBM people from early on placed arrow symbols into the CGA/EGA/VGA font sets at certain character positions. You can find these documented in various places including Peter Nortons popular book "Inside the PC".

Michael Karas





List of 20 messages in thread
TopicAuthorDate
ascii arrow            01/01/70 00:00      
   RE: ascii arrow            01/01/70 00:00      
      RE: ascii arrow            01/01/70 00:00      
   RE: ascii arrow            01/01/70 00:00      
   RE: ascii arrow            01/01/70 00:00      
      RE: ascii arrow            01/01/70 00:00      
         RE: ascii arrow            01/01/70 00:00      
         RE: ascii arrow            01/01/70 00:00      
            RE: ascii arrow            01/01/70 00:00      
   RE: ascii arrow            01/01/70 00:00      
      RE: ascii arrow            01/01/70 00:00      
         RE: ascii arrow            01/01/70 00:00      
         RE: ascii arrow            01/01/70 00:00      
            RE: ascii arrow            01/01/70 00:00      
               RE: ascii arrow            01/01/70 00:00      
                  RE: ascii arrow            01/01/70 00:00      
                     RE: ascii arrow            01/01/70 00:00      
                        RE: ascii arrow            01/01/70 00:00      
   RE: ascii arrow            01/01/70 00:00      
      Not ASCII            01/01/70 00:00      

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