Question: Where can I get a Mnemonic Assembler for DSK54Plus?

Answer: There is not a mnemonic assembler specifically for the " C54x DSKplus (only Algebraic). You can use ASM500 and LNK500 to create a .OUT file. The debugger can load .out files by going into the [FILE] [LOAD PROGRAM] and clicking on the .out selection in the "list file types" box