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SM511: added undocumented opcodes

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This commit is contained in:
hap 2016-03-22 12:26:40 +01:00
parent f29fc8c3db
commit e28ac68d81
4 changed files with 16 additions and 6 deletions
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5
src/devices/cpu/sm510/sm510.cpp
View File

@ -19,7 +19,10 @@
- callback for lcd screen as MAME bitmap (when needed)
- LCD bs pin blink mode via Y register (0.5s off, 0.5s on)
- LB/SBM is correct?
- SM511 unknown opcodes
- SM511 undocumented/guessed opcodes:
* $01 is guessed as DIV to ACC transfer, unknown which bits
* $5d is certainly CEND
* $65 is certainly IDIV, but not sure if it behaves same as on SM510
*/

1
src/devices/cpu/sm510/sm510.h
View File

@ -260,6 +260,7 @@ protected:
void op_skip();
void op_cend();
void op_idiv();
void op_dta();
void op_illegal();
};

6
src/devices/cpu/sm510/sm510op.cpp
View File

@ -450,6 +450,12 @@ void sm510_base_device::op_idiv()
m_div = 0;
}
void sm510_base_device::op_dta()
{
// DTA: transfer divider low bits to ACC
m_acc = BITSWAP16(m_div,0,0,0,0, 0,0,0,0, 0,0,0,0, 7,8,9,10) & 0xf;
}
void sm510_base_device::op_illegal()
{
logerror("%s unknown opcode $%02X at $%04X\n", tag(), m_op, m_prev_pc);

10
src/devices/cpu/sm510/sm511core.cpp
View File

@ -63,8 +63,8 @@ sm512_device::sm512_device(const machine_config &mconfig, const char *tag, devic
void sm511_device::get_opcode_param()
{
// XXX?, LBL, PRE, TL, TML and prefix opcodes are 2 bytes
if (m_op == 0x01 || (m_op >= 0x5f && m_op <= 0x61) || (m_op & 0xf0) == 0x70 || (m_op & 0xfc) == 0x68)
// LBL, PRE, TL, TML and prefix opcodes are 2 bytes
if ((m_op >= 0x5f && m_op <= 0x61) || (m_op & 0xf0) == 0x70 || (m_op & 0xfc) == 0x68)
{
m_icount--;
m_param = m_program->read_byte(m_pc);
@ -102,7 +102,7 @@ void sm511_device::execute_one()
switch (m_op)
{
case 0x00: op_rot(); break;
// case 0x01: op_xxx(); break; // ?
case 0x01: op_dta(); break; // guessed
case 0x02: op_sbm(); break;
case 0x03: op_atpl(); break;
case 0x08: op_add(); break;
@ -119,7 +119,7 @@ void sm511_device::execute_one()
case 0x5a: op_ta0(); break;
case 0x5b: op_tabl(); break;
case 0x5c: op_atx(); break;
// case 0x5d: op_cend(); break;
case 0x5d: op_cend(); break;
case 0x5e: op_tal(); break;
case 0x5f: op_lbl(); break;
@ -127,7 +127,7 @@ void sm511_device::execute_one()
case 0x62: op_wr(); break;
case 0x63: op_ws(); break;
case 0x64: op_incb(); break;
// case 0x65: op_idiv(); break;
case 0x65: op_idiv(); break;
case 0x66: op_rc(); break;
case 0x67: op_sc(); break;
case 0x6c: op_decb(); break;