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Diffstat (limited to 'trunk/src/emu/machine/cdp1871.c')
-rw-r--r-- | trunk/src/emu/machine/cdp1871.c | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/cdp1871.c b/trunk/src/emu/machine/cdp1871.c new file mode 100644 index 00000000000..c87ceb54ab8 --- /dev/null +++ b/trunk/src/emu/machine/cdp1871.c @@ -0,0 +1,305 @@ +/********************************************************************** + + RCA CDP1871 Keyboard Encoder emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +#include "emu.h" +#include "cdp1871.h" +#include "cpu/mcs48/mcs48.h" +#include "machine/devhelpr.h" + + +// device type definition +const device_type CDP1871 = &device_creator<cdp1871_device>; + + +//************************************************************************** +// MACROS / CONSTANTS +//************************************************************************** + +static const UINT8 CDP1871_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, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, CDP1871, "RCA CDP1871", tag, owner, clock), + m_inhibit(false), + m_sense(0), + m_drive(0), + m_next_da(CLEAR_LINE), + m_next_rpt(CLEAR_LINE) +{ + +} + + +//------------------------------------------------- +// device_config_complete - perform any +// operations now that the configuration is +// complete +//------------------------------------------------- + +void cdp1871_device::device_config_complete() +{ + // inherit a copy of the static data + const cdp1871_interface *intf = reinterpret_cast<const cdp1871_interface *>(static_config()); + if (intf != NULL) + *static_cast<cdp1871_interface *>(this) = *intf; + + // or initialize to defaults if none provided + else + { + memset(&out_da_cb, 0, sizeof(out_da_cb)); + memset(&out_rpt_cb, 0, sizeof(out_rpt_cb)); + // m_in_d_cb[] + memset(&in_shift_cb, 0, sizeof(in_shift_cb)); + memset(&in_control_cb, 0, sizeof(in_control_cb)); + memset(&in_alpha_cb, 0, sizeof(in_alpha_cb)); + } +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void cdp1871_device::device_start() +{ + // resolve callbacks + m_out_da_func.resolve(out_da_cb, *this); + m_out_rpt_func.resolve(out_rpt_cb, *this); + m_in_d_func[0].resolve(in_d1_cb, *this); + m_in_d_func[1].resolve(in_d2_cb, *this); + m_in_d_func[2].resolve(in_d3_cb, *this); + m_in_d_func[3].resolve(in_d4_cb, *this); + m_in_d_func[4].resolve(in_d5_cb, *this); + m_in_d_func[5].resolve(in_d6_cb, *this); + m_in_d_func[6].resolve(in_d7_cb, *this); + m_in_d_func[7].resolve(in_d8_cb, *this); + m_in_d_func[8].resolve(in_d9_cb, *this); + m_in_d_func[9].resolve(in_d10_cb, *this); + m_in_d_func[10].resolve(in_d11_cb, *this); + m_in_shift_func.resolve(in_shift_cb, *this); + m_in_control_func.resolve(in_control_cb, *this); + m_in_alpha_func.resolve(in_alpha_cb, *this); + + // 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_control)); + 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_out_da_func(m_da); + } + + if (m_next_rpt != m_rpt) + { + m_rpt = m_next_rpt; + + m_out_rpt_func(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; + + data = m_in_d_func[m_drive](0); + + if (data == (1 << m_sense)) + { + if (!m_inhibit) + { + m_shift = m_in_shift_func(); + m_control = m_in_control_func(); + m_inhibit = true; + m_next_da = ASSERT_LINE; + } + else + { + m_next_rpt = ASSERT_LINE; + } + } + else + { + m_inhibit = false; + m_next_rpt = CLEAR_LINE; + } +} + + +//------------------------------------------------- +// data_r - keyboard data read +//------------------------------------------------- + +READ8_MEMBER( cdp1871_device::data_r ) +{ + int table = 0; + int alpha = m_in_alpha_func(); + + if (m_control) table = 3; else if (m_shift) table = 2; else if (alpha) table = 1; + + // reset DA on next TPB + m_next_da = CLEAR_LINE; + + return CDP1871_KEY_CODES[table][m_drive][m_sense]; +} + + +//------------------------------------------------- +// da_r - data available +//------------------------------------------------- + +READ_LINE_MEMBER( cdp1871_device::da_r ) +{ + return m_da; +} + + +//------------------------------------------------- +// rpt_r - keyboard repeat +//------------------------------------------------- + +READ_LINE_MEMBER( cdp1871_device::rpt_r ) +{ + return m_rpt; +} |