public override void set_context(object reg)
{
if (reg != null)
{
I = (nec_Regs)reg;
I._base[CS] = (uint)(I.sregs[CS] << 4);
I._base[DS] = (uint)(I.sregs[DS] << 4);
I._base[ES] = (uint)(I.sregs[ES] << 4);
I._base[SS] = (uint)(I.sregs[SS] << 4);
if (cur_mrhard[((I._base[CS] + I.ip)) >> (8 + 0 + 0)] != ophw)
Mame.cpu_setOPbase20((int)(I._base[CS] + I.ip), 0);
}
}
private int DefaultBase(int Seg, nec_Regs I)
{
return(((seg_prefix != 0) && (Seg == 3 || Seg == 2)) ? prefix_base : (int)(I.sregs[Seg] << 4));
}
public override void create_context(ref object reg)
{
reg = new nec_Regs();
}
void nec_reset(object param)
{
uint i, j, c;
BREGS[] reg_name = { (BREGS)AL, (BREGS)CL, (BREGS)DL, (BREGS)BL, (BREGS)AH, (BREGS)CH, (BREGS)DH, (BREGS)BH };
I = new nec_Regs();
I.sregs[CS] = 0xffff;
I._base[CS] = (uint)(I.sregs[CS] << 4);
change_pc20((uint)(I._base[CS] + I.ip));
for (i = 0; i < 256; i++)
{
for (j = i, c = 0; j > 0; j >>= 1)
if ((j & 1) != 0) c++;
parity_table[i] = (byte)((c & 1) == 0 ? 1 : 0);
}
I.ZeroVal = I.ParityVal = 1;
I.MF = 1; /* set the mode-flag = native mode */
for (i = 0; i < 256; i++)
{
Mod_RM.reg.b[i] = reg_name[(i & 0x38) >> 3];
Mod_RM.reg.w[i] = (WREGS)((i & 0x38) >> 3);
}
for (i = 0xc0; i < 0x100; i++)
{
Mod_RM.RM.w[i] = (WREGS)(i & 7);
Mod_RM.RM.b[i] = (BREGS)reg_name[i & 7];
}
}
