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315-5649: fix prev (nw)

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This commit is contained in:
MetalliC 2019-11-09 07:52:57 +02:00
parent 61c32ea237
commit 873a307e84
1 changed files with 19 additions and 4 deletions
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23
src/mame/machine/315_5649.cpp
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@ -121,12 +121,22 @@ READ8_MEMBER( sega_315_5649_device::read )
data = m_port_value[offset];
break;
// serial channel 1/2 input
// RS-422 channel 1/2 input
case 0x0b: data = m_serial_rd_cb[0](0); break;
case 0x0c: data = m_serial_rd_cb[1](0); break;
// serial status
case 0x0d: data = 0; break; // not implemented
// RS-422 status
// 7--- ---- RX2IE
// -6-- ---- RX1IE some I-error ?
// --5- ---- RX2FE
// ---4 ---- RX1FE framing error ?
// ---- 3--- RX2BF
// ---- -2-- RX1BF 1 = receive buffer full
// ---- --1- TX2BF
// ---- ---0 TX1BF 1 = transmit buffer full
case 0x0d:
data = 0x0c; // HACK, recv buffers always full, transmit buffers always empty
break;
// analog input, auto-increments
case 0x0f:
@ -162,11 +172,16 @@ WRITE8_MEMBER( sega_315_5649_device::write )
// port direction register (0 = output, 1 = input)
case 0x08: m_port_config = data; break;
// serial channel 1/2 output
// RS-422 channel 1/2 output
case 0x09: m_serial_wr_cb[0](data); break;
case 0x0a: m_serial_wr_cb[1](data); break;
// mode register
// 7--- ---- port G counter mode
// -6-- ---- ?
// --5- ---- RS-422 satellite mode
// ---4 ---- RS-422 loopback
// ---- 3210 RS-422 satellite N#
case 0x0e:
m_mode = data;
break;