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2 Commits
release_6 ... master

Author SHA1 Message Date
David Banks
7d0a837a77 65C02: Reset exec_held in MOS6502CpuMonCore (fixes issue with BeebFpga/Gowin) 
Change-Id: I9b2a58d7dc911c81bf93090fd8711d4e1d6ae873
 2025-01-29 10:29:25 +00:00
David Banks
0d1a15b48b 65C02: Minor changes to NOP behaviour 
Change-Id: I55da014148fb2302d31a095a3463c91289fd8dba
 2025-01-29 10:27:08 +00:00
2 changed files with 6 additions and 5 deletions
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10
src/AlanD/R65Cx2.vhd
View File

@ -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.

1
src/MOS6502CpuMonCore.vhd
View File

@ -300,6 +300,7 @@ begin
begin
if cpu_reset_n = '0' then
state <= idle;
exec_held <= '0';
elsif rising_edge(cpu_clk) then
-- Extend the control signals from BusMonitorCore which
-- only last one cycle.