mirror of
https://github.com/holub/mame
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109 lines
2.5 KiB
C
109 lines
2.5 KiB
C
// license:BSD-3-Clause
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// copyright-holders:Miodrag Milanovic
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/***************************************************************************
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AC1 video driver by Miodrag Milanovic
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15/01/2009 Preliminary driver.
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****************************************************************************/
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#include "emu.h"
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#include "machine/z80pio.h"
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#include "imagedev/cassette.h"
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#include "includes/ac1.h"
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READ8_MEMBER(ac1_state::ac1_port_b_r)
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{
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UINT8 data = 0x7f;
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if (m_cassette->input() > 0.03)
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data |= 0x80;
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return data;
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}
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#define BNOT(x) ((x) ? 0 : 1)
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READ8_MEMBER(ac1_state::ac1_port_a_r)
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{
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UINT8 line0 = m_io_line[0]->read();
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UINT8 line1 = m_io_line[1]->read();
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UINT8 line2 = m_io_line[2]->read();
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UINT8 line3 = m_io_line[3]->read();
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UINT8 line4 = m_io_line[4]->read();
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UINT8 line5 = m_io_line[5]->read();
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UINT8 line6 = m_io_line[6]->read();
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UINT8 SH = BNOT(BIT(line6,0));
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UINT8 CTRL = BNOT(BIT(line6,1));
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UINT8 SPACE = BIT(line6,2);
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UINT8 ENTER = BIT(line6,3);
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UINT8 BACK = BIT(line6,4);
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UINT8 all = line0 | line1 | line2 | line3 | line4 | line5;
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UINT8 s1 = BNOT(BIT(all,0));UINT8 z1 = (line0 !=0) ? 0 : 1;
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UINT8 s2 = BNOT(BIT(all,1));UINT8 z2 = (line1 !=0) ? 0 : 1;
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UINT8 s3 = BNOT(BIT(all,2));UINT8 z3 = (line2 !=0) ? 0 : 1;
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UINT8 s4 = BNOT(BIT(all,3));UINT8 z4 = (line3 !=0) ? 0 : 1;
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UINT8 s5 = BNOT(BIT(all,4));UINT8 z5 = (line4 !=0) ? 0 : 1;
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UINT8 s6 = BNOT(BIT(all,5));UINT8 z6 = (line5 !=0) ? 0 : 1;
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UINT8 s7 = BNOT(BIT(all,6));
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UINT8 s8 = BNOT(BIT(all,7));
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UINT8 tast,td0,td1,td2,td3,td4,td5,td6,dg5;
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/* Additional double keys */
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if (SPACE) {
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z1 = 0; s1 = 0; SH = 0;
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}
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if (ENTER) {
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z4 = 0; s6 = 0; CTRL = 0;
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}
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if (BACK) {
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z4 = 0; s1 = 0; CTRL = 0;
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}
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tast = BNOT(s1 & s2 & s3 & s4 & s5 &s6 & s7 & s8);
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td0 = BNOT(s2 & s4 & s6 & s8);
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td1 = BNOT(s3 & s4 & s7 & s8);
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td2 = BNOT(s5 & s6 & s7 & s8);
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td3 = BNOT(z2 & z4 & z6);
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td4 = BNOT(BNOT(BNOT(z1 & z2) & SH) & z5 & z6);
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dg5 = BNOT(z3 & z4 & z5 & z6);
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td5 = BNOT(BNOT(dg5 & BNOT(SH)) & z1 & z2);
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td6 = (dg5 & CTRL);
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return td0 + (td1 << 1) +(td2 << 2) +(td3 << 3) +(td4 << 4) +(td5 << 5) +(td6 << 6) +(tast << 7);
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}
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WRITE8_MEMBER(ac1_state::ac1_port_a_w)
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{
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}
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WRITE8_MEMBER(ac1_state::ac1_port_b_w)
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{
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/*
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bit description
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0
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1 RTTY receive
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2 RTTY transmit
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3 RTTY PTT
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4
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5
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6 cassette out
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7 cassette in
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*/
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m_cassette->output((data & 0x40) ? -1.0 : +1.0);
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}
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/* Driver initialization */
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DRIVER_INIT_MEMBER(ac1_state,ac1)
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{
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}
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void ac1_state::machine_reset()
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{
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}
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