static int spunchout_prot_r( int offset ) {
switch ( offset ) {
case 0x00:
if ( prot_mode_sel == 0x0a )
return cpu_readmem16(0xd012);
if ( prot_mode_sel == 0x0b || prot_mode_sel == 0x23 )
return cpu_readmem16(0xd7c1);
return prot_mem[offset];
break;
case 0x01:
if ( prot_mode_sel == 0x08 ) /* PC = 0x0b6a */
return 0x00; /* under 6 */
break;
case 0x02:
if ( prot_mode_sel == 0x0b ) /* PC = 0x0613 */
return 0x09; /* write "JMP (HL)"code to 0d79fh */
if ( prot_mode_sel == 0x09 ) /* PC = 0x20f9, 0x22d9 */
return prot_mem[offset]; /* act as registers */
break;
case 0x03:
if ( prot_mode_sel == 0x09 ) /* PC = 0x1e4c */
return prot_mem[offset] & 0x07; /* act as registers with mask */
break;
case 0x05:
if ( prot_mode_sel == 0x09 ) /* PC = 0x29D1 */
return prot_mem[offset] & 0x03; /* AND 0FH -> AND 06H */
break;
case 0x06:
if ( prot_mode_sel == 0x0b ) /* PC = 0x2dd8 */
return 0x0a; /* E=00, HL=23E6, D = (ret and 0x0f), HL+DE = 2de6 */
if ( prot_mode_sel == 0x09 ) /* PC = 0x2289 */
return prot_mem[offset] & 0x07; /* act as registers with mask */
break;
case 0x09:
if ( prot_mode_sel == 0x09 ) /* PC = 0x0313 */
return ( prot_mem[15] << 4 ); /* pipe through register 0xf7 << 4 */
/* (ret or 0x10) -> (D7DF),(D7A0) - (D7DF),(D7A0) = 0d0h(ret nc) */
break;
case 0x0a:
if ( prot_mode_sel == 0x0b ) /* PC = 0x060a */
return 0x05; /* write "JMP (IX)"code to 0d79eh */
if ( prot_mode_sel == 0x09 ) /* PC = 0x1bd7 */
return prot_mem[offset] & 0x01; /* AND 0FH -> AND 01H */
break;
case 0x0b:
if ( prot_mode_sel == 0x09 ) /* PC = 0x2AA3 */
return prot_mem[11] & 0x03; /* AND 0FH -> AND 03H */
break;
case 0x0c:
/* PC = 0x2162 */
/* B = 0(return value) */
return 0x00;
case 0x0d:
return prot_mode_sel;
break;
}
if ( errorlog )
fprintf( errorlog, "Read from unknown protection? port %02x ( selector = %02x )\n", offset, prot_mode_sel );
return prot_mem[offset];
}
static UINT8 RM(UINT32 a)
{
return cpu_readmem16(a);
}
static INLINE UINT8 READ_BYTE(UINT16 adr)
{
return cpu_readmem16(adr);
}