Born Dead #09
30 мая 1999 |
|
World Amiga - Amiga eyes RRA (last part).
WORLD Amigo. LAST PART (C) 1999>> RRA>> / AF / SG (Okonchanie. Beginning in rooms 5-8) -------------------------------------------------- ------------- ROL, ROR - rotate (without the flag X) Syntax: ROd Dx, Dy ROd # , Dy ROd <ea> Where d - the shift direction Size:. B,. W,. L Description: The rotation of DST in a certain direction. Flag X is not involved in the rotation. Counter rotation can be specified in two ways: 1) from 1 to 8 2) in the data register The team works with memory (ROd <ea>) produ rotation leads to 1-bit operand size only. W <Ea> can not be addressing: Dn, An ROL: C <operand < ROR: > Operand> C Flags: X - does not change V = 0 N, Z - vary according to the result C - the last bit, which is involved in rotation -------------------------------------------------- ------------- ROXL, ROXR - rotation with the flag X Syntax: ROXd Dx, Dy ROXd # , Dy ROXd <ea> Where d - the shift direction Size:. B,. W,. L Description: The rotation of DST in a certain direction. Flag of the X involved in the rotation. Counter rotation can be specified in two ways: 1) from 1 to 8 2) in the data register The team works with memory (ROXd <ea>) an drives a rotation of 1-bit operand size only . W <Ea> can not be addressing: Dn, An ROXL: C <operand <X < ROR: > X> Operand -> C Flags: V = 0 N, Z - vary according to the result X, C - the last bit, which is involved in rotation -------------------------------------------------- ------------- RTD - return from subroutine with an increase in SP (Do not know exactly both had called for this team to another, but she lives on Elder processor) Operation: PC = (SP), SP +4 + disp Syntax: RTD #Description: The PC is removed from the stack, then the pointer Stack added option # . This command typically used when calling routine several options were passed through the stack. Flags: do not change -------------------------------------------------- ------------- RTM - the return of the unit (MC68020) Syntax: RTM Rn Description: Restores previously saved state module, then returned to him. Nothing intelligent to modules I can not say because I can not even imagine that such a module and what it eats. Yes, and I do not want to know anything about They, after all except the CPU MC68020, their Nowhere is no more. -------------------------------------------------- ------------- RTR - Return to the restoration register flags. Do not think that this is our native Television Advertising Russia. Operation: CCR = (SP), SP +2, PC = (SP), SP +4 Syntax: RTR Description: Do not think that this is our native Advertising Television Russia Removed from the stack register CCR, and then the PC. Part of the register SR is available in supervisor mode does not change. Flags: as already mentioned, are removed from the stack. -------------------------------------------------- ------------- RTS - return from subroutine Operation: PC = (SP), SP +4 Syntax: RTS Description: The neizvraschenny return from the subroutine. Just removed PC from the stack and all! Flags: do not change -------------------------------------------------- ------------- SBCD - decimal subtraction, taking into account the flag X Operation: DST = DST10-SRC10-X Syntax: SBCD Dy, Dx SBCD - (Ay), - (Ay) others addressing is not possible. Size:. B Description: Subtracts the BCD-number one from another, and the heap subtracts from all of this flag is X. Flags: C, X - change N, V - indefinitely Z - 0, if the result is not 0, otherwise changes (!). For a correct determination this flag, before surgery, it should be install. -------------------------------------------------- ------------- Scc - set in accordance with condition Syntax: Scc <ea> Size:. B Description: If the condition is true, then B <ea> written be written # FF, 0 otherwise. Terms and conditions I have already written twice, third time I just to scrap (see the team and Bcc DBcc). I want to note Team: ST - the condition is always true, so the result is # FF SF - never true, then the result 0. By the way, is often used combinations of commands Scc and NEG.B. The result of this combination: if the condition true, then the result is 1, otherwise 0. Of course both These teams should be made on one <ea> For example: TST.L D1 SMI D0 NEG.B D0 In this case, if D1 is negative, D0 = 1, D0 = 0 otherwise. Flags: do not change -------------------------------------------------- ------------- SUB, SUBA, SUBI, SUBQ - Subtraction Syntax: SUB <ea>, Dn SUB Dn, <ea> SUBA <ea>, An SUBI # , <ea> SUBQ # , <ea> Size:. B,. W,. L SUBA -. W,. L Description: SUB - subtract from the data register operand in <ea> or vice versa. SUBA - subtracted from the address register operand in <ea> SUBI - subtract operands <ea> any number. SUBQ - subtract operands <ea> number from 1 to 8. Prohibition of addressing: An available only for operations. W,. L Flags: change everything except program SUBA, it is not affects the flags. -------------------------------------------------- ------------ SUBX - subtraction, taking into account the flag X Operation: DST = DST-SRC-X Syntax: SUBX Dy, Dx SUBX - (Ay), - (Ay) others addressing is not possible. Size:. B,. W,. L Description: Subtract one number from the X flag of another. Flags: C, X - change N, V - indefinitely Z - 0, if the result is not 0, otherwise changes (!). For a correct determination this flag, before surgery, it should be install. -------------------------------------------------- ------------- SWAP - swap halves Register Operation: bits 31-16 <-> bits 15-0 Syntax: SWAP Dn Description: Swaps the 16-bit halves of the register. For example: was: 00000000000000001111111111111111 # 0000FFFF was: 11111111111111110000000000000000 # FFFF0000 Flags: X - does not change V, C = 0 N, Z - change -------------------------------------------------- ------------- TAS - Test and set operand Syntax: TAS <ea> Size:. B Description: Tests the addressable operand field <ea>, then sets its seventh bit. Addressing the forbidden: An Flags: X - does not change V, C = 0 N, Z - change -------------------------------------------------- ------------- TRAP - an exception TRAP Operation: register bit S SR = 1, that is to say supervisor mode SSP-2, (SSP) = FORMAT / OFFSET (*) SSP-4, (SSP) = PC, SSP-2, (SSP) = SR PC = address of the vector (*) This line does not work for MC68000 Syntax: TRAP # <vector> Description: This command is analogous principle the pisishnoy Team INT # N. She throws a TRAP (Vector # 20 - # 2F, 32-47). Number of vector calculation us to simply: Value # <vector> 32. This parameter can be set from 0 to 15. The principle of exceptions and interrupts, I will describe a very soon, and while scoring this text I do not want ... Flags: do not change -------------------------------------------------- ------------- TRAPcc - TRAP by (SENIOR percent). Syntax: TRAPcc TRAPcc.W # TRAPcc.L # Description: If the condition is true, then action is called lyuchenie TRAPcc (vector 7), otherwise the prog does Xia further. And that's why there is a parameter # I did not vkuril. When dopret say. Flags: unaffected. -------------------------------------------------- ------------- TRAPV - TRAP overflow Syntax: TRAPV Description: This team has always treated separately from teams TRAPcc, because unlike TRAPcc TRAPV team is all family processors M680x0. And so, the function is the same. -------------------------------------------------- ------------- TST - test operands Syntax: TST <ea> Size:. B,. W,. L Description: Compares the operand with zero. Prohibition of addressing: An and the register PC is not available on the MC68000, the rest please. Flags: X - does not change V, C = 0 N, Z - change -------------------------------------------------- ------------ UNLK - kill the stack frame Operation: SP = An, An = (SP), SP +4 Syntax: UNLK An Description: Kills the stack frame is organized by a team LINK. And he does it this way: SP equates to specified register address. Then remove from the stack stored value is the same case. And truncated in order. _ZAPOMNITE! _ Like the FOR loop does not can live without a NEXT, and the LINK will die without UNLK. In other words, if LINK has been made in the subspace program and you have not done before leaving UNLK, then where return your procedure can only guess. Flags: do not change -------------------------------------------------- ------------ UNPK - unpack the BCD-number (the elder processor) Syntax: UNPK - (Ax), - (Ay), # UNPK Dx, Dy, # Description: Unpacking is so Makarov: Bits 0-3 and 4-7, the source operand (bagged BCD-number) are transferred in bits 0-3 and 8-11 respectively respectively operand receiver (obtained unpacked BCD-number), the bits 4-7 and 12-15 filled nyayutsya zeros. And to finish before the end of all this process is added to the result parameter # . If you are using predekrementnaya addressing, then read one byte, and written two. Why do I explain I will not, will understand. In general, it is time to call it a day. I want to sleep! Tomorrow at work! Flags: do not change what they were and have remained so!
Other articles:
Similar articles:
В этот день... 23 November