125 lines
1.8 KiB
Forth
125 lines
1.8 KiB
Forth
( Z80 assembler )
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( Splits word into msb/lsb, lsb being on TOS )
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: SPLITB
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DUP 0x100 /
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SWAP 0xff AND
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;
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: A, .X ;
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7 CONSTANT A
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0 CONSTANT B
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1 CONSTANT C
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2 CONSTANT D
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3 CONSTANT E
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4 CONSTANT H
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5 CONSTANT L
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6 CONSTANT (HL)
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0 CONSTANT BC
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1 CONSTANT DE
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2 CONSTANT HL
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3 CONSTANT AF
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3 CONSTANT SP
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( -- )
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: OP1 CREATE C, DOES> C@ A, ;
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0xc9 OP1 RET,
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0x76 OP1 HALT,
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( r -- )
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: OP1r
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CREATE C,
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DOES>
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C@ ( r op )
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SWAP ( op r )
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8 * ( op r<<3 )
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OR A,
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;
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0x04 OP1r INCr,
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0x46 OP1r LDr(HL),
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0x70 OP1r LD(HL)r,
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( qq -- also works for ss )
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: OP1qq
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CREATE C,
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DOES>
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C@ ( qq op )
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SWAP ( op qq )
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16 * ( op qq<<4 )
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OR A,
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;
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0xc5 OP1qq PUSHqq,
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0xc1 OP1qq POPqq,
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0x03 OP1qq INCss,
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0x09 OP1qq ADHLss,
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( rd rr )
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: OP1rr
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CREATE C,
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DOES>
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C@ ( rd rr op )
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ROT ( rr op rd )
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8 * ( rr op rd<<3 )
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OR OR A,
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;
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0x40 OP1rr LDrr,
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( n -- )
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: OP2n
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CREATE C,
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DOES>
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C@ A, A,
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;
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0xd3 OP2n OUTAn,
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0xdb OP2n INAn,
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( r n -- )
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: OP2rn
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CREATE C,
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DOES>
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C@ ( r n op )
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ROT ( n op r )
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8 * ( n op r<<3 )
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OR A, A,
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;
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0x06 OP2rn LDrn,
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( b r -- )
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: OP2br
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CREATE C,
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DOES>
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0xcb A,
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C@ ( b r op )
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ROT ( r op b )
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8 * ( r op b<<3 )
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OR OR Z,
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;
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0xc0 OP2br SETbr,
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0x80 OP2br RESbr,
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0x40 OP2br BITbr,
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( dd nn -- )
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: OP3ddnn
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CREATE C,
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DOES>
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C@ ( dd nn op )
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ROT ( nn op dd )
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16 * ( nn op dd<<4 )
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OR A,
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SPLITB A, A,
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;
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0x01 OP2ddnn LDddnn,
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( nn -- )
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: OP3nn
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CREATE C,
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DOES>
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C@ A,
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SPLITB A, A,
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;
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0xcd OP3nn CALLnn,
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0xc3 OP3nn JPnn,
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( Specials )
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: JRe, 0x18 A, 2 - A, ;
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