260 lines
3.8 KiB
Forth
260 lines
3.8 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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256 /MOD SWAP
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;
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( To debug, change C, to .X )
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: A, C, ;
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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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( As a general rule, IX and IY are equivalent to spitting an
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extra 0xdd / 0xfd and then spit the equivalent of HL )
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: IX 0xdd A, HL ;
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: IY 0xfd A, HL ;
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: _ix+- 0xff AND 0xdd A, (HL) ;
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: _iy+- 0xff AND 0xfd A, (HL) ;
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: IX+ _ix+- ;
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: IX- 0 -^ _ix+- ;
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: IY+ _iy+- ;
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: IY- 0 -^ _iy+- ;
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: <<3 8 * ;
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: <<4 16 * ;
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( -- )
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: OP1 CREATE C, DOES> C@ A, ;
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0xeb OP1 EXDEHL,
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0x76 OP1 HALT,
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0xc9 OP1 RET,
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0x17 OP1 RLA,
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0x07 OP1 RLCA,
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0x1f OP1 RRA,
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0x0f OP1 RRCA,
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0x37 OP1 SCF,
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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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<<3 ( op r<<3 )
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OR A,
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;
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0x04 OP1r INCr,
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0x05 OP1r DECr,
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( r -- )
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: OP1r0
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CREATE C,
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DOES>
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C@ ( r op )
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OR A,
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;
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0xa0 OP1r0 ANDr,
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0xb0 OP1r0 ORr,
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0xa8 OP1r0 XORr,
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0xb8 OP1r0 CPr,
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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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<<4 ( 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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0x0b OP1qq DECss,
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0x09 OP1qq ADDHLss,
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: _1rr
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C@ ( rd rr op )
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ROT ( rr op rd )
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<<3 ( rr op rd<<3 )
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OR OR A,
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;
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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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_1rr
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;
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0x40 OP1rr LDrr,
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( ixy+- HL rd )
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: LDIXYr,
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( dd/fd has already been spit )
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LDrr, ( ixy+- )
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A,
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;
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( rd ixy+- HL )
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: LDrIXY,
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ROT ( ixy+- HL rd )
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SWAP ( ixy+- rd HL )
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LDIXYr,
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;
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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 OUTnA,
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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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<<3 ( 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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<<3 ( r op b<<3 )
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OR OR A,
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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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( bitwise rotation ops have a similar sig )
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( r -- )
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: OProt
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CREATE C,
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DOES>
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0xcb A,
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C@ ( r op )
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OR A,
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;
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0x10 OProt RLr,
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0x00 OProt RLCr,
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0x18 OProt RRr,
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0x08 OProt RRCr,
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0x20 OProt SLAr,
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0x38 OProt SRLr,
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( cell contains both bytes. MSB is spit as-is, LSB is ORed with r )
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( r -- )
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: OP2r
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CREATE ,
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DOES>
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@ SPLITB SWAP ( r lsb msb )
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A, ( r lsb )
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SWAP <<3 ( lsb r<<3 )
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OR A,
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;
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0xed41 OP2r OUT(C)r,
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0xed40 OP2r INr(C),
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( ss -- )
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: OP2ss
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CREATE C,
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DOES>
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0xed A,
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C@ SWAP ( op ss )
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<<4 ( op ss<< 4 )
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OR A,
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;
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0x4a OP2ss ADCHLss,
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0x42 OP2ss SBCHLss,
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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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<<4 ( 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 OP3ddnn 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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0x22 OP3nn LD(nn)HL,
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0x2a OP3nn LDHL(nn),
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: OPJR
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CREATE C,
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DOES>
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C@ A, 2 - A,
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;
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0x18 OPJR JRe,
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0x38 OPJR JRCe,
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0x30 OPJR JRNCe,
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0x28 OPJR JRZe,
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0x20 OPJR JRNZe,
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0x10 OPJR DJNZe,
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( Specials )
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( dd nn -- )
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: LDdd(nn),
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0xed A,
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SWAP <<4 0x4b OR A,
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SPLITB A, A,
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;
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( nn dd -- )
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: LD(nn)dd,
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0xed A,
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<<4 0x43 OR A,
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SPLITB A, A,
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;
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( JTBL+18 == next )
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: JPNEXT, [ JTBL 18 + LITN ] JPnn, ;
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: CODE
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( same as CREATE, but with native word )
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(entry)
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( JTBL+15 == next )
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[ JTBL 15 + LITN ] ,
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;
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: ;CODE JPNEXT, ;
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( Routines )
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( JTBL+21 == next )
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: chkPS, [ JTBL 21 + LITN ] CALLnn, ;
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