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65C02: Minor changes to NOP behaviour

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Change-Id: I55da014148fb2302d31a095a3463c91289fd8dba
This commit is contained in:
David Banks 2025-01-29 10:27:08 +00:00
parent b9577f5b01
commit 0d1a15b48b
1 changed files with 5 additions and 5 deletions
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10
src/AlanD/R65Cx2.vhd
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@ -369,7 +369,7 @@ architecture Behavioral of R65C02 is
"1000" & "100010" & readIndX & aluInT & aluEor, -- 41 EOR (zp,x)
"0000" & "000000" & immediate & aluInXXX & aluXXX, -- 42 NOP ------- 65C02
"0000" & "000000" & implied & aluInXXX & aluXXX, -- 43 NOP ------- 65C02
"0000" & "000000" & immediate & aluInXXX & aluXXX, -- 44 NOP ------- 65C02
"0000" & "000000" & readZp & aluInXXX & aluXXX, -- 44 NOP ------- 65C02
"1000" & "100010" & readZp & aluInT & aluEor, -- 45 EOR zp
"0000" & "100011" & rmwZp & aluInT & aluLsr, -- 46 LSR zp
"0000" & "000000" & implied & aluInXXX & aluXXX, -- 47 NOP ------- 65C02
@ -385,7 +385,7 @@ architecture Behavioral of R65C02 is
"1000" & "100010" & readIndY & aluInT & aluEor, -- 51 EOR (zp),y
"1000" & "100010" & readInd & aluInT & aluEor, -- 52 EOR (zp) -------- 65C02
"0000" & "000000" & implied & aluInXXX & aluXXX, -- 53 NOP ------- 65C02
"0000" & "000000" & immediate & aluInXXX & aluXXX, -- 54 NOP ------- 65C02
"0000" & "000000" & readZpX & aluInXXX & aluXXX, -- 54 NOP ------- 65C02
"1000" & "100010" & readZpX & aluInT & aluEor, -- 55 EOR zp,x
"0000" & "100011" & rmwZpX & aluInT & aluLsr, -- 56 LSR zp,x
"0000" & "000000" & implied & aluInXXX & aluXXX, -- 57 NOP ------- 65C02
@ -518,7 +518,7 @@ architecture Behavioral of R65C02 is
"0000" & "100011" & readIndY & aluInT & aluCmp, -- D1 CMP (zp),y
"0000" & "100011" & readInd & aluInT & aluCmp, -- D2 CMP (zp) ------ 65C02
"0000" & "000000" & implied & aluInXXX & aluXXX, -- D3 NOP ----- 65C02
"0000" & "000000" & immediate & aluInXXX & aluXXX, -- D4 NOP ----- 65C02
"0000" & "000000" & readZpX & aluInXXX & aluXXX, -- D4 NOP ----- 65C02
"0000" & "100011" & readZpX & aluInT & aluCmp, -- D5 CMP zp,x
"0000" & "100010" & rmwZpX & aluInT & aluDec, -- D6 DEC zp,x
"0000" & "000000" & implied & aluInXXX & aluXXX, -- D7 NOP ----- 65C02
@ -551,7 +551,7 @@ architecture Behavioral of R65C02 is
"1000" & "110011" & readIndY & aluInT & aluSbc, -- F1 SBC (zp),y
"1000" & "110011" & readInd & aluInT & aluSbc, -- F2 SBC (zp) ------ 65C02
"0000" & "000000" & implied & aluInXXX & aluXXX, -- F3 NOP ----- 65C02
"0000" & "000000" & immediate & aluInXXX & aluXXX, -- F4 NOP ----- 65C02
"0000" & "000000" & readZpX & aluInXXX & aluXXX, -- F4 NOP ----- 65C02
"1000" & "110011" & readZpX & aluInT & aluSbc, -- F5 SBC zp,x
"0000" & "100010" & rmwZpX & aluInT & aluInc, -- F6 INC zp,x
"0000" & "000000" & implied & aluInXXX & aluXXX, -- F7 NOP ---- 65C02
@ -775,7 +775,7 @@ begin
varC := ninebits(8);
case opcInfo(aluMode2From to aluMode2To) is
-- Flags Affected: n v — — — — z c
-- Flags Affected: n v - - - - z c
-- n Set if most significant bit of result is set; else cleared.
-- v Set if signed overflow; cleared if valid signed result.
-- z Set if result is zero; else cleared.