Update README.md

OSToastBach · Mar 28, 2023 · ee8a373 · ee8a373
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@@ -7,6 +7,8 @@ Bored of BASIC? No problem!
 Due to the Dragon's lack of `[` and `]` characters, which are quite important in brainfuck, the inputs have been swapped with `(` and `)`.
 As for some reason square brackets are in the character set but there are no keys for it on the keyboard!
 
+As the Dragon does not use a standard character set, the values for characters are slightly different. An image of all the available characters for reference can be seen [here](https://www.chibiakumas.com/6809/res/DragonChars.png) and on page 136 of ["An introduction to BASIC programming using the DRAGON"](www.dragondata.co.uk/Publications/BASIC-MAN/DRAGON_32_BASIC_MANUAL_rel-v2.pdf)
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 ## Compiling
 
 To compile, `asm6809` is needed, optionally `bin2cas` and `dragondos` but these two are not required for building the binary and are just to create the disk and tape images.