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sm510: lb/sbm seems ok (nw)

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This commit is contained in:
hap 2017-04-30 10:59:05 +02:00
parent 33170b8521
commit 835a86ce3b
2 changed files with 3 additions and 16 deletions
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3
src/devices/cpu/sm510/sm510.cpp
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@ -26,11 +26,12 @@
- proper support for LFSR program counter in debugger
- 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?
- SM510 buzzer control divider bit is mask-programmable?
- SM511 undocumented/guessed opcodes:
* $01 is guessed as DIV to ACC transfer, unknown which bits
* $5d is certainly CEND
* $65 is certainly divider reset, but not sure if it behaves same as on SM510
* $6036 may be instruction timing? (16KHz vs 8KHz)
*/

16
src/devices/cpu/sm510/sm510op.cpp
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@ -58,22 +58,8 @@ inline u8 sm510_base_device::bitmask(u16 param)
void sm510_base_device::op_lb()
{
// LB x: load BM/BL with 4-bit immediate value (partial)
// SM510 WIP..
// bm and bl(low) are probably ok!
m_bm = (m_bm & 4) | (m_op & 3);
m_bl = (m_op >> 2 & 3);
// bl(high) is still unclear, official doc is confusing
u8 hi = 0;
switch (m_bl)
{
case 0: hi = 0; break;
case 1: hi = 3; break;
case 2: hi = 3; break;
case 3: hi = 3; break;
}
m_bl |= (hi << 2 & 0xc);
m_bl = (m_op >> 2 & 3) | ((m_op & 0xc) ? 0xc : 0);
}
void sm510_base_device::op_lbl()