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implemented read operation of MRA and MRB in 68681 device (this command is necessary for adp games)

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This commit is contained in:
Roberto Zandona 2008-08-14 19:12:47 +00:00
parent 56e734716a
commit 9c68b61e38
1 changed files with 26 additions and 0 deletions
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26
src/emu/machine/68681.c
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@ -269,6 +269,7 @@ static UINT8 duart68681_read_rx_fifo(duart68681_state *duart68681, int ch)
}
}
duart68681_update_interrupts(duart68681);
return r;
};
@ -321,8 +322,20 @@ READ8_DEVICE_HANDLER(duart68681_r)
offset &= 0xf;
LOG(( "Reading 68681 (%s) reg %x (%s) ", device->tag, offset, duart68681_reg_read_names[offset] ));
switch (offset)
{
case 0x00: /* MR1A/MR2A */
if ( duart68681->channel[0].MR_ptr == 0 )
{
r = duart68681->channel[0].MR1;
duart68681->channel[0].MR_ptr = 1;
}
else
{
r = duart68681->channel[0].MR2;
}
break;
case 0x01: /* SRA */
r = duart68681->channel[0].SR;
break;
@ -346,6 +359,17 @@ READ8_DEVICE_HANDLER(duart68681_r)
case 0x05: /* ISR */
r = duart68681->ISR;
break;
case 0x08: /* MR1B/MR2B */
if ( duart68681->channel[1].MR_ptr == 0 )
{
r = duart68681->channel[1].MR1;
duart68681->channel[1].MR_ptr = 1;
}
else
{
r = duart68681->channel[1].MR2;
}
break;
case 0x09: /* SRB */
r = duart68681->channel[1].SR;
break;
@ -381,6 +405,7 @@ READ8_DEVICE_HANDLER(duart68681_r)
break;
}
LOG(("returned %02x\n", r));
return r;
}
@ -390,6 +415,7 @@ WRITE8_DEVICE_HANDLER(duart68681_w)
offset &= 0x0f;
LOG(( "Writing 68681 (%s) reg %x (%s) with %04x\n", device->tag, offset, duart68681_reg_write_names[offset], data ));
switch(offset)
{
case 0x00: /* MRA */