| CLASSES #0, #1: Page Zero    000 rr aaaaaaa ; register 'rr' <-- [ 00000 aaaaaaa ]  {  ldz r, addr }
001 rr aaaaaaa ; register 'rr' --> [ 00000 aaaaaaa ]  {  stz r, addr }
 
 Direct addressing is limitted to registers A, B, C and D.
 In the mnemonic, addr represents the 7 least significant bits of the address
 being bits 8-11 all zeros.
 
 
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