// license:BSD-3-Clause // copyright-holders:Juergen Buchmueller /********************************************************************** Rockwell 10788 General Purpose Keyboard and Display circuit REGISTER DESCRIPTION [ Opcodes IOL, I2 ] NAME W/IO CS I/O CMD I/O Names -------------------------------------------------------------- KTR 1 1 x x x 1 1 0 0 Transfer Keyboard Return KTS 1 1 x x x 1 0 1 0 Transfer Keyboard Strobe KLA 1 1 x x x 1 1 1 0 Load Display Register A KLB 1 1 x x x 1 1 0 1 Load Display Register A KDN 1 1 x x x 0 0 1 1 Turn On Display KAF 1 1 x x x 1 0 1 1 Turn Off A KBF 1 1 x x x 0 1 1 1 Turn Off B KER 1 1 x x x 0 1 1 0 Reset Keyboard Error Notes: 1.) W/IO is generated by the first word of the PPS IOL instruction. 2.) Polarities of I/O7, I/O6 and I/O5 must be the same as the polarities of the chip select straps SC7, SC6 and SC5. 3.) KLA resets DA1-DA4 and DB1 and DB2 to VSS level. KLB resets DB3 and DB4 to VSS level. 4.) KAF and KBF is used to blank the display without changing the contents of display data registers. 5.) KAF resets output lines DA1, DA2, DA3, DA4, DB1 and DB2 to VSS level. KBF resets output lines DB3 and DB4 to VSS level. 6.) KAF stops the circulation of the display register A, and KBF stops the circulation of the display register B. 7.) KER takes a maximum of 10-bit times to complete (= 80 clocks) Therefore, there must be at least 10 bit times between KER and the next KTS instruction. **********************************************************************/ #include "emu.h" #include "machine/r10788.h" #define VERBOSE 0 #if VERBOSE #define LOG(x) logerror x #else #define LOG(x) #endif /************************************* * * Device interface * *************************************/ const device_type R10788 = &device_creator; r10788_device::r10788_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, R10788, "Rockwell 10788", tag, owner, clock, "r10788", __FILE__), m_ktr(0), m_kts(0), m_kla(0), m_klb(0), m_mask_a(15), m_mask_b(15), m_ker(0), m_io_counter(0), m_scan_counter(0), m_display(*this) { } /** * @brief r10788_device::device_start device-specific startup */ void r10788_device::device_start() { m_display.resolve(); save_item(NAME(m_reg)); save_item(NAME(m_ktr)); save_item(NAME(m_kts)); save_item(NAME(m_kla)); save_item(NAME(m_klb)); save_item(NAME(m_mask_a)); save_item(NAME(m_mask_b)); save_item(NAME(m_ker)); save_item(NAME(m_io_counter)); save_item(NAME(m_scan_counter)); m_timer = timer_alloc(TIMER_DISPLAY); // recurring timer every 36 cycles m_timer->adjust(clocks_to_attotime(36), 0, clocks_to_attotime(36)); } /** * @brief r10788_device::device_reset device-specific reset */ void r10788_device::device_reset() { memset(m_reg, 0x00, sizeof(m_reg)); m_ktr = 0; m_kts = 0; m_kla = 0; m_klb = 0; m_mask_a = 15; m_mask_b = 15; m_ker = 0; m_scan_counter = 0; } /** * @brief r10788_device::device_timer timer event callback * @param timer emu_timer which fired * @param id timer identifier * @param param parameter * @param ptr pointer parameter */ void r10788_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { uint8_t data; switch (id) { case TIMER_DISPLAY: data = (m_reg[0][m_scan_counter] & m_mask_a) + 16 * (m_reg[1][m_scan_counter] & m_mask_b); LOG(("%s: scan counter:%2d data:%02x\n", __FUNCTION__, m_scan_counter, data)); m_display(m_scan_counter, data, 0xff); break; default: LOG(("%s: invalid timer id:%d\n", __FUNCTION__, id)); } m_scan_counter = (m_scan_counter + 1) % 16; } /************************************* * * Constants * *************************************/ /************************************* * * Command access handlers * *************************************/ WRITE8_MEMBER( r10788_device::io_w ) { assert(offset < 16); switch (offset) { case KTR: // Transfer Keyboard Return LOG(("%s: KTR data:%02x\n", __FUNCTION__, data)); m_ktr = data; break; case KTS: // Transfer Keyboard Strobe LOG(("%s: KTS data:%02x\n", __FUNCTION__, data)); m_kts = data; break; case KLA: // Load Display Register A LOG(("%s: KLA [%2d] data:%02x\n", __FUNCTION__, m_io_counter, data)); m_kla = data; m_reg[0][m_io_counter] = m_kla; break; case KLB: // Load Display Register B LOG(("%s: KLB [%2d] data:%02x\n", __FUNCTION__, m_io_counter, data)); m_klb = data; m_reg[1][m_io_counter] = m_kla; break; case KDN: // Turn On Display LOG(("%s: KDN data:%02x\n", __FUNCTION__, data)); m_mask_a = 15; m_mask_b = 15; break; case KAF: // Turn Off A LOG(("%s: KAF data:%02x\n", __FUNCTION__, data)); m_mask_a = 0; m_mask_b &= ~3; break; case KBF: // Turn Off B LOG(("%s: KBF data:%02x\n", __FUNCTION__, data)); m_mask_b &= ~12; break; case KER: // Reset Keyboard Error LOG(("%s: KER data:%02x\n", __FUNCTION__, data)); m_ker = 10; break; } } READ8_MEMBER( r10788_device::io_r ) { assert(offset < 16); uint8_t data = 0xf; switch (offset) { case KTR: // Transfer Keyboard Return data = m_ktr; LOG(("%s: KTR data:%02x\n", __FUNCTION__, data)); break; case KTS: // Transfer Keyboard Strobe data = m_kts; LOG(("%s: KTS data:%02x\n", __FUNCTION__, data)); break; case KLA: // Load Display Register A m_kla = m_reg[0][m_io_counter]; data = m_kla; LOG(("%s: KLA [%2d] data:%02x\n", __FUNCTION__, m_io_counter, data)); break; case KLB: // Load Display Register B m_klb = m_reg[1][m_io_counter]; data = m_klb; LOG(("%s: KLB [%2d] data:%02x\n", __FUNCTION__, m_io_counter, data)); // FIXME: does it automagically increment at KLB write? m_io_counter = (m_io_counter + 1) % 16; break; case KDN: // Turn On Display LOG(("%s: KDN data:%02x\n", __FUNCTION__, data)); break; case KAF: // Turn Off A LOG(("%s: KAF data:%02x\n", __FUNCTION__, data)); break; case KBF: // Turn Off B LOG(("%s: KBF data:%02x\n", __FUNCTION__, data)); break; case KER: // Reset Keyboard Error LOG(("%s: KER data:%02x\n", __FUNCTION__, data)); break; } return data; }