HI,
Martin, note the ZXPRINTER printer can "Display" specials characters codes by moving the IR register on a RAM offset!
The ULA display will be corrupt, but the printer UDG will be changed.
In Forth:
~@~ is equal to ~£~ and ~!~ is equal to ~$~ on ZX81
~[~ is equal to ~-(~ and ~]~ is equal to ~)-~ ,
~'~ is equal to ~(?)~
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Xavier ...on the Facebook groupe : "Zx81 France"(fr)