// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** RCA CDP1871 Keyboard Encoder emulation **********************************************************************/ #include "cdp1871.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** const device_type CDP1871 = &device_creator; //************************************************************************** // MACROS / CONSTANTS //************************************************************************** const UINT8 cdp1871_device::key_codes[4][11][8] = { // normal { { 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37 }, { 0x38, 0x39, 0x3a, 0x3b, 0x2c, 0x2d, 0x2e, 0x2f }, { 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67 }, { 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f }, { 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77 }, { 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f }, { 0x20, 0xff, 0x0a, 0x1b, 0xff, 0x0d, 0xff, 0x7f }, { 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87 }, { 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f }, { 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97 }, { 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f } }, // alpha { { 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37 }, { 0x38, 0x39, 0x3a, 0x3b, 0x2c, 0x2d, 0x2e, 0x2f }, { 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47 }, { 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f }, { 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57 }, { 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f }, { 0x20, 0xff, 0x0a, 0x1b, 0xff, 0x0d, 0xff, 0x7f }, { 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87 }, { 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f }, { 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97 }, { 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f } }, // shift { { 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 }, { 0x28, 0x29, 0x2a, 0x2b, 0x3c, 0x3d, 0x3e, 0x3f }, { 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47 }, { 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f }, { 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57 }, { 0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f }, { 0x20, 0xff, 0x0a, 0x1b, 0xff, 0x0d, 0xff, 0x7f }, { 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87 }, { 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f }, { 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97 }, { 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f } }, // control { { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 }, { 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 }, { 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f }, { 0x20, 0xff, 0x0a, 0x1b, 0xff, 0x0d, 0xff, 0x7f }, { 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87 }, { 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f }, { 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97 }, { 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f } } }; //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // cdp1871_device - constructor //------------------------------------------------- cdp1871_device::cdp1871_device(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock) : device_t(mconfig, CDP1871, "RCA CDP1871", tag, owner, clock, "cdp1871", __FILE__), m_read_d1(*this), m_read_d2(*this), m_read_d3(*this), m_read_d4(*this), m_read_d5(*this), m_read_d6(*this), m_read_d7(*this), m_read_d8(*this), m_read_d9(*this), m_read_d10(*this), m_read_d11(*this), m_write_da(*this), m_write_rpt(*this), m_inhibit(false), m_sense(0), m_drive(0), m_shift(0), m_shift_latch(0), m_control(0), m_control_latch(0), m_alpha(0), m_da(0), m_next_da(CLEAR_LINE), m_rpt(0), m_next_rpt(CLEAR_LINE) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void cdp1871_device::device_start() { // resolve callbacks m_read_d1.resolve_safe(0xff); m_read_d2.resolve_safe(0xff); m_read_d3.resolve_safe(0xff); m_read_d4.resolve_safe(0xff); m_read_d5.resolve_safe(0xff); m_read_d6.resolve_safe(0xff); m_read_d7.resolve_safe(0xff); m_read_d8.resolve_safe(0xff); m_read_d9.resolve_safe(0xff); m_read_d10.resolve_safe(0xff); m_read_d11.resolve_safe(0xff); m_write_da.resolve_safe(); m_write_rpt.resolve_safe(); // set initial values change_output_lines(); // allocate timers m_scan_timer = timer_alloc(); m_scan_timer->adjust(attotime::zero, 0, attotime::from_hz(clock())); // register for state saving save_item(NAME(m_inhibit)); save_item(NAME(m_sense)); save_item(NAME(m_drive)); save_item(NAME(m_shift)); save_item(NAME(m_shift_latch)); save_item(NAME(m_control)); save_item(NAME(m_control_latch)); save_item(NAME(m_alpha)); save_item(NAME(m_da)); save_item(NAME(m_next_da)); save_item(NAME(m_rpt)); save_item(NAME(m_next_rpt)); } //------------------------------------------------- // device_timer - handler timer events //------------------------------------------------- void cdp1871_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { change_output_lines(); clock_scan_counters(); detect_keypress(); } //------------------------------------------------- // change_output_lines - change output lines //------------------------------------------------- void cdp1871_device::change_output_lines() { if (m_next_da != m_da) { m_da = m_next_da; m_write_da(m_da); } if (m_next_rpt != m_rpt) { m_rpt = m_next_rpt; m_write_rpt(m_rpt); } } //------------------------------------------------- // clock_scan_counters - clock the keyboard // scan counters //------------------------------------------------- void cdp1871_device::clock_scan_counters() { if (!m_inhibit) { m_sense++; if (m_sense == 8) { m_sense = 0; m_drive++; if (m_drive == 11) { m_drive = 0; } } } } //------------------------------------------------- // detect_keypress - detect key press //------------------------------------------------- void cdp1871_device::detect_keypress() { UINT8 data = 0; switch (m_drive) { case 0: data = m_read_d1(0); break; case 1: data = m_read_d2(0); break; case 2: data = m_read_d3(0); break; case 3: data = m_read_d4(0); break; case 4: data = m_read_d5(0); break; case 5: data = m_read_d6(0); break; case 6: data = m_read_d7(0); break; case 7: data = m_read_d8(0); break; case 8: data = m_read_d9(0); break; case 9: data = m_read_d10(0); break; case 10: data = m_read_d11(0); break; } if (data == (1 << m_sense)) { if (!m_inhibit) { m_shift_latch = m_shift; m_control_latch = m_control; m_inhibit = true; m_next_da = ASSERT_LINE; } else { m_next_rpt = ASSERT_LINE; } } else { m_inhibit = false; m_next_rpt = CLEAR_LINE; } } //------------------------------------------------- // read - keyboard data read //------------------------------------------------- READ8_MEMBER( cdp1871_device::read ) { int table = 0; if (m_control_latch) table = 3; else if (m_shift_latch) table = 2; else if (m_alpha) table = 1; // reset DA on next TPB m_next_da = CLEAR_LINE; return key_codes[table][m_drive][m_sense]; }