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Corrected a major oversight in the instruction encoding of the SSEM core [MooglyGuy]

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This commit is contained in:
Ryan Holtz 2009-06-02 02:18:44 +00:00
parent 1e190e8be5
commit 799228d1b4
2 changed files with 7 additions and 7 deletions
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10
src/emu/cpu/ssem/ssem.c
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@ -32,8 +32,8 @@ INLINE ssem_state *get_safe_token(const device_config *device)
return (ssem_state *)device->token; return (ssem_state *)device->token;
} }
#define INSTR (op & 7) #define INSTR ((op >> 13) & 7)
#define ADDR ((op >> 3) & 0x1f) #define ADDR (op & 0x1f)
/*****************************************************************************/ /*****************************************************************************/
@ -144,7 +144,7 @@ INLINE void WRITE32(ssem_state *cpustate, UINT32 address, UINT32 data)
static CPU_INIT( ssem ) static CPU_INIT( ssem )
{ {
ssem_state *cpustate = get_safe_token(device); ssem_state *cpustate = get_safe_token(device);
cpustate->pc = 0; cpustate->pc = 1;
cpustate->a = 0; cpustate->a = 0;
cpustate->halt = 0; cpustate->halt = 0;
@ -160,7 +160,7 @@ static CPU_RESET( ssem )
{ {
ssem_state *cpustate = get_safe_token(device); ssem_state *cpustate = get_safe_token(device);
cpustate->pc = 0; cpustate->pc = 1;
cpustate->a = 0; cpustate->a = 0;
cpustate->halt = 0; cpustate->halt = 0;
} }
@ -172,7 +172,7 @@ static CPU_EXECUTE( ssem )
cpustate->icount = cycles; cpustate->icount = cycles;
cpustate->pc &= 0x1fff; cpustate->pc &= 0x1f;
while (cpustate->icount > 0) while (cpustate->icount > 0)
{ {

4
src/emu/cpu/ssem/ssemdasm.c
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@ -37,8 +37,8 @@ INLINE UINT32 reverse(UINT32 v)
offs_t ssem_dasm_one(char *buffer, offs_t pc, UINT32 op) offs_t ssem_dasm_one(char *buffer, offs_t pc, UINT32 op)
{ {
UINT8 instr = reverse(op) & 7; UINT8 instr = (reverse(op) >> 13) & 7;
UINT8 addr = (reverse(op) >> 3) & 0x1f; UINT8 addr = reverse(op) & 0x1f;
output = buffer; output = buffer;