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Okay-with a couple of new books in hand and good night's sleep behind you, strike out on your own a little Set yourself a goal, and try to achieve it: something tough, say, an assembly language utility that locates all files anywhere on a hard disk drive with a given ambiguous file name That's ambitious for a newcomer and will take some research and study and (perhaps) a few false starts But you can do it, and once you do it you'll be a real journeyman assembly language programmer Becoming a master takes work, and time Michael Abrash's massive Graphics Programming Black Book (recently out of print but still in some stores) is a compilation of the secret knowledge of a programming master It's not easy reading, but it will give you a good idea where your mind has to be to consider yourself an expert assembly language programmer Keep programming Michael can show you things that would have taken you years to discover on your own, but they won't stick in your mind unless you use them Set yourself a real challenge, something that has to be both correct and fast: Rotate graphics objects in 3-D, transfer data through a serial port at 19,200 bits per second, things like that You can do it Coming to believe the truth in that statement is the essence of stepping away from Square One-and the rest of the road, like all roads, is taken one step at a time
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Appendix A: Partial 8086/8088 Instruction Set Reference
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Overview
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Instruction AAA ADC ADD AND BT CALL CLC CLD CMP DEC IMUL INC INT IRET J JCXZ JECXZ JMP LEA LOOP LOOPNZ/LOOPNE LOOPZ/LOOPE MOV NEG NOP NOT OR POP POPA POPAD POPF POPFD PUSH PUSHA PUSHAD PUSHF PUSHFD 570 571 572 573 574 575 576 Reference Page 535 536 538 540 542 543 544 545 546 548 549 551 552 553 554 556 557 558 559 560 561 562 563 564 565 566 567 568 569 374 183 21 309 11 86 263 Only in Appendix A 389 422 190 Only in Appendix A 276 389 422 75 212 Only in Appendix A 213 67 214 253 253 253 465 115 251 251 85 465 386+ 286+ 386+ 386+ 286+ 386+ Text Page 310 201 11 67 466 454 386+
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RET ROL ROR SBB SHL SHR STC STD STOS SUB XCHG XOR
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577 578 580 582 583 585 587 588 589 590 592 593
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263 316 316 11 316 316 Only in Appendix A 376 596 140 198 86
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Notes on the Instruction Set Reference Instruction Operands
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When an instruction takes two operands, the destination operand is the one on the left, and the source operand is the one on the right In general, when a result is produced by an instruction, the result replaces the destination operand For example, in this instruction: ADD BX,SI the BX register is added to the SI register, and the sum is then placed in the BX register, overwriting whatever was in BX before the addition
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Flag Results
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Each instruction contains a flag summary that looks like this (the asterisks will vary from instruction to instruction): O D I T S Z A P C F F F F F F F F F * * * * * * OF: Overflow flag TF: Trap flag AF: Aux carry DF: Direction flag SF: Sign flag PF: Parity flag IF: Interrupt flag ZF: Zero flag CF: Carry flag
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The nine flags are all represented here An asterisk indicates that the instruction on that page affects that flag If a flag is affected at all (that is, if it has an asterisk beneath it), it will be affected according to these rules: OF IF TF SF ZF AF PF Set if the result is too large to fit in the destination operand Set by the STI instruction; cleared by CLI For debuggers; not used in normal programming and may be ignored Set when the sign of the result forces the destination operand to become negative Set if the result of an operation is zero If the result is nonzero, ZF is cleared Auxiliary carry used for 4-bit BCD math Set when an operation causes a carry out of a 4-bit BCD quantity Set if the number of 1 bits in the low byte of the result is even; cleared if the number of 1 bits in the low byte of the result is odd Used in data communications applications but little else Set if the result of an add or shift operation carries out a bit beyond the destination operand; otherwise cleared May be manually set by STC and manually cleared by CLC when CF must be in a known state before an operation begins
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Some instructions force certain flags to become undefined When this is the case, it is noted under "Notes" Undefined means don't count on it being in any particular state
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AAA Adjust AL after BCD Addition Flags affected:
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O D I T S Z A P C F F F F F F F F F * * OF: Overflow flag TF: Trap flag AF: Aux carry DF: Direction flag SF: Sign flag PF: Parity flag IF: Interrupt flag ZF: Zero flag CF: Carry flag
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AAA makes an addition come out right in AL when what you're adding are BCD values rather than ordinary binary values Note well that AAA does not perform the arithmetic itself, but is a postprocessor after ADD or ADC The AL register is an implied operand and may not be explicitly stated-so make sure that the preceding ADD or ADC instruction leaves its results in AL! A BCD digit is a byte with the high 4 bits set to 0, and the low 4 bits containing a digit from 0 to 9 AAA will yield garbage results if the preceding ADD or ADC acted upon one or both operands with values greater than 09 After the addition of two legal BCD values, AAA will adjust a non-BCD result (that is, a result greater than 09 in AL) to a value between 0 and 9 This is called a decimal carry, since it is the carry of a BCD digit and not simply the carry of a binary bit For example, if ADD added 08 and 04 (both legal BCD values) to produce 0C in AL, AAA will take the 0C and adjust it to 02 The decimal carry goes to AH, not to the upper 4 bits of AL, which are always cleared to 0 by AAA If the preceding ADD or ADC resulted in a decimal carry (as in the preceding example), both CF and AF are set to 1 and AH is incremented by 1 Otherwise, AH is not incremented and CF and AF are cleared to 0 This instruction is subtle See the detailed discussion in 11 r8 = AL AH BL BH CL CH DL DH sr = CS DS SS ES FS GS m8 = 8-bit memory data m32 = 32-bit memory data i16 = 16-bit immediate data d8 = 8-bit signed displacement d32 = 32-bit unsigned displacement r16 = AX BX CX DX BP SP SI DI r32 = EAX EBX ECX EDX EBP ESP ESI EDI m16 = 16-bit memory data i8 = 8-bit immediate data i32 = 32-bit immediate data d16 = 16-bit signed displacement
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ADC Arithmetic Addition with Carry Flags affected:
O D I T S Z A P C F F F F F F F F F * * * * * * OF: Overflow flag TF: Trap flag AF: Aux carry DF: Direction flag SF: Sign flag PF: Parity flag IF: Interrupt flag ZF: Zero flag CF: Carry flag
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ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC ADC r8,r8 m8,r8 r8,m8 r16,r16 m16,r16 r16,m16 r32,r32 m32,r32 r32,m32 r8,i8 m8,i8 r16,i16 m16,i16 r32,i32 m32,i32 r16,i8 m16,i8 r32,i8 m32,i8 AL,i8 AX,i16 EAX,i32