Compuprint 10200 Programmer Manual - Manual (Page 69)

Commands
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If you wish to copy an entry over another entry so that two characters with the same
characteristics and different code are present in the same look up table, the DLL sequence ESC
= n m id p t has the following meaning:
n and m: Indicate the byte number of the sequence n is the low part and m is the high
part.
id: Indicates the printer model. The id related to your printer is 23H.
p and t: Indicate the memory address of the character that you wish to replace. p is the
low part and t is the high part.
data: Is the entry 9 bytes of the character that you want to position at address
specified by p and t.