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8086asm: tidy up a bit

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This commit is contained in:
Virgil Dupras 2020-06-13 16:21:56 -04:00
parent 374932fa4d
commit 5033f17be2
4 changed files with 10 additions and 10 deletions
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10
blk/753
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@ -1,12 +1,12 @@
: OP1 CREATE C, DOES> C@ A, ;
0xac OP1 LODSB, 0xfa OP1 CLI, 0xfb OP1 STI,
0xf4 OP1 HLT, 0xfc OP1 CLD, 0xfd OP1 STD,
( no argument, jumps with abs addrs are special )
0xeb OP1 JMPs, 0xe9 OP1 JMPn, 0x74 OP1 JZ,
: MOVri, SWAP 0xb0 OR A, A, ;
: MOVrI, SWAP 0xb0 OR A, SPLITB A, A, ;
: MOVsx, 0x8e A, SWAP MODRMrr A, ;
: INT, 0xcd A, A, ;
( no argument, flow ops are special )
: JMP8, 0xeb A, ; : JMP16, 0xe9 A, ; : JZ, 0x74 A, ;
: JMPr, 0xff A, 7 AND 0xe0 OR A, ;
: LODSB, 0xac A, ; : CLI, 0xfa A, ; : HLT, 0xf4 A, ;
: STI, 0xfb A, ;
: ORrr, 0x08 A, MODRMrr A, ;
: XORxx, 0x31 A, MODRMrr A, ;
: CLD, 0xfc A, ; : STD, 0xfd A, ;

2
blk/755
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@ -1,4 +1,4 @@
: FWR8 BSET 0 A, ;
: FWRs BSET 0 A, ;
: FSET @ THEN, ;
( : BREAK, FJR, 0x8000 OR ;
: BREAK?, DUP 0x8000 AND IF

2
blk/811
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@ -1,5 +1,5 @@
H@ ORG ! 0x7c00 BIN( ! ( BIOS loads boot bin at 0x7c00 )
JMP8, L1 FWR8 ( start )
JMPs, L1 FWRs ( start )
ORG @ 0x25 + HERE ! ( bypass BPB )
L1 FSET ( start )
CLI, CLD, AX AX XORxx, DS AX MOVsx, ES AX MOVsx,

6
blk/812
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@ -1,10 +1,10 @@
H@ ORG ! 0x8000 BIN( !
JMP8, L1 FWR8 ( start )
JMPs, L1 FWRs ( start )
L2 ( msg ) BSET ," Hello World!" 0 A,
L1 FSET ( start )
SI L2 @ ( msg ) MOVrI, AH 0x0e MOVri, ( print char )
L1 BSET ( loop ) LODSB, AL AL ORrr, ( end of str? )
JZ, L2 FWR8 ( next ) 0x10 INT, ( print char )
JMP8, L1 ( loop ) BWR
JZ, L2 FWRs ( next ) 0x10 INT, ( print char )
JMPs, L1 ( loop ) BWR
L2 FSET ( next ) AH 0 MOVri, 0x16 INT, ( read kbd )
AH 0x0e MOVri, 0x10 INT, ( spit read char ) HLT, ( done )