// license:BSD-3-Clause // copyright-holders:Wilbert Pol,Gabriele D'Antona /* Research Machines 380Z (aka "RML 380Z" or "RM 380Z") Microcomputer produced by Research Machines Limited, Oxford, UK 1978-1985 MESS driver by Wilbert Pol and friol (dantonag (at) gmail.com) Driver started on 22/12/2011 === Memory map from sevice manual: PAGE SEL bit in PORT0 set to 0: 0000-3BFF - CPU RAM row 1 (15KB!) 3C00-7BFF - CPU RAM row 2 (16KB) 7C00-BBFF - Add-on RAM row 1 or HRG RAM (16KB) BC00-DFFF - Add-on RAM row 2 (9KB!) E000-EFFF - ROM (COS) F000-F5FF - VDU and HRG Video RAM F600-F9FF - ROM (monitor extension) FA00-FAFF - Reserved, RAM? FB00-FBFF - Memory-mapped ports (FBFC-FBFF) FC00-FFFF - RAM PAGE SEL bit in PORT0 set to 1: 0000-0FFF - ROM (COS mirror from E000) 1B00-1BFF - Memory-mapped ports (1BFC-1BFF) 1C00-1DFF - ROM 4000-7FFF - CPU RAM row 1 (16KB!, this RAM normally appears at 0000) 8000-BFFF - ??? C000-DFFF - ??? E000-EFFF - ROM (COS) F000-F5FF - VDU and HRG Video RAM F600-F9FF - ROM (monitor extension) FA00-FAFF - Reserved, RAM? FB00-FBFF - Memory-mapped ports (FBFC-FBFF) FC00-FFFF - RAM Video resolution (not confirmed): 80x24 - 6 pixels wide (5 + spacing), 10 pixels high (9 + spacing) = 480x240 Video input clock is 16MHz According to the manuals, VDU-1 chargen is Texas 74LS262. === Notes on COS 4.0 disassembly: - routine at 0xe438 is called at startup in COS 4.0 and it sets the RST vectors in RAM - routine at 0xe487 finds "top" of system RAM and stores it in 0x0006 and 0x000E - 0xeca0 - outputs a string (null terminated) to screen (?) - 0xff18 - does char output to screen (char in A?) === TODO: - Properly implement "backwards" or "last 4 lines" scrolling - Properly implement dimming and graphic chars (>0x80) - Understand why any write to disk command fails with "bad sector" - Understand why ctrl-U (blinking cursor) in COS 4.0 stops keyboard input from working - Get a reliable ROM dump and charset ROM dump Attempt to register save state entry after state registration is closed! Module timer tag static_vblank_timer name m_param Attempt to register save state entry after state registration is closed! Module timer tag static_vblank_timer name m_enabled Attempt to register save state entry after state registration is closed! Module timer tag static_vblank_timer name m_period.attoseconds Attempt to register save state entry after state registration is closed! Module timer tag static_vblank_timer name m_period.seconds Attempt to register save state entry after state registration is closed! Module timer tag static_vblank_timer name m_start.attoseconds Attempt to register save state entry after state registration is closed! Module timer tag static_vblank_timer name m_start.seconds Attempt to register save state entry after state registration is closed! Module timer tag static_vblank_timer name m_expire.attoseconds Attempt to register save state entry after state registration is closed! Module timer tag static_vblank_timer name m_expire.seconds ':maincpu' (E48B): unmapped program memory write to E000 = C1 & FF ':maincpu' (E48E): unmapped program memory write to E000 = 3E & FF */ #include "includes/rm380z.h" #define KEYBOARD_TAG "keyboard" static ADDRESS_MAP_START(rm380z_mem, AS_PROGRAM, 8, rm380z_state) AM_RANGE( 0xe000, 0xefff ) AM_ROM AM_REGION(RM380Z_MAINCPU_TAG, 0) AM_RANGE( 0xf000, 0xf5ff ) AM_READWRITE(videoram_read,videoram_write) AM_RANGE( 0xf600, 0xf9ff ) AM_ROM AM_REGION(RM380Z_MAINCPU_TAG, 0x1000) /* Extra ROM space for COS4.0 */ AM_RANGE( 0xfa00, 0xfaff ) AM_RAM AM_RANGE( 0xfb00, 0xfbff ) AM_READWRITE( port_read, port_write ) AM_RANGE( 0xfc00, 0xffff ) AM_READWRITE(hiram_read,hiram_write) ADDRESS_MAP_END static ADDRESS_MAP_START( rm380z_io , AS_IO, 8, rm380z_state) ADDRESS_MAP_GLOBAL_MASK(0xff) AM_RANGE(0x00, 0xbf) AM_READWRITE(rm380z_portlow_r, rm380z_portlow_w) AM_RANGE(0xc0, 0xc3) AM_DEVREADWRITE("wd1771", fd1771_t, read, write) AM_RANGE(0xc4, 0xc4) AM_WRITE(disk_0_control) AM_RANGE(0xc5, 0xff) AM_READWRITE(rm380z_porthi_r, rm380z_porthi_w) ADDRESS_MAP_END INPUT_PORTS_START( rm380z ) // PORT_START("additional_chars") // PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Escape") PORT_CODE(KEYCODE_ESC) PORT_CODE(KEYCODE_ESC) INPUT_PORTS_END // // // static SLOT_INTERFACE_START( rm380z_floppies ) SLOT_INTERFACE("sssd", FLOPPY_525_SSSD) SLOT_INTERFACE_END UINT32 rm380z_state::screen_update_rm380z(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { update_screen(bitmap); return 0; } static MACHINE_CONFIG_START( rm380z, rm380z_state ) /* basic machine hardware */ MCFG_CPU_ADD(RM380Z_MAINCPU_TAG, Z80, XTAL_4MHz) MCFG_CPU_PROGRAM_MAP(rm380z_mem) MCFG_CPU_IO_MAP(rm380z_io) /* video hardware */ MCFG_SCREEN_ADD("screen", RASTER) MCFG_SCREEN_REFRESH_RATE(50) MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0)) // according to videos and pictures of the real hardware, chars are spaced of at least 1 pixel // and there is at least 1 pixel between each row of characters MCFG_SCREEN_SIZE((RM380Z_SCREENCOLS*(RM380Z_CHDIMX+1)), (RM380Z_SCREENROWS*(RM380Z_CHDIMY+1))) MCFG_SCREEN_VISIBLE_AREA(0, (RM380Z_SCREENCOLS*(RM380Z_CHDIMX+1))-1, 0, (RM380Z_SCREENROWS*(RM380Z_CHDIMY+1))-1) MCFG_SCREEN_UPDATE_DRIVER(rm380z_state, screen_update_rm380z) MCFG_SCREEN_PALETTE("palette") MCFG_PALETTE_ADD_MONOCHROME("palette") /* RAM configurations */ MCFG_RAM_ADD(RAM_TAG) MCFG_RAM_DEFAULT_SIZE("56K") /* floppy disk */ MCFG_FD1771_ADD("wd1771", XTAL_1MHz) MCFG_FLOPPY_DRIVE_ADD("wd1771:0", rm380z_floppies, "sssd", floppy_image_device::default_floppy_formats) MCFG_FLOPPY_DRIVE_ADD("wd1771:1", rm380z_floppies, "sssd", floppy_image_device::default_floppy_formats) /* keyboard */ MCFG_DEVICE_ADD(KEYBOARD_TAG, GENERIC_KEYBOARD, 0) MCFG_GENERIC_KEYBOARD_CB(WRITE8(rm380z_state, keyboard_put)) MACHINE_CONFIG_END /* ROM definition */ ROM_START( rm380z ) ROM_REGION( 0x10000, RM380Z_MAINCPU_TAG, 0 ) // ROM_LOAD( "cos34e-m.bin", 0x0000, 0x1000, CRC(20e2ddf4) SHA1(3177b28793d5a348c94fd0ae6393d74e2e9a8662)) // I'm not sure of how those roms have been dumped. I don't know if those are good dumps or not. ROM_LOAD( "cos40b-m.bin", 0x0000, 0x1000, BAD_DUMP CRC(1f0b3a5c) SHA1(0b29cb2a3b7eaa3770b34f08c4fd42844f42700f)) ROM_LOAD( "cos40b-m_f600-f9ff.bin", 0x1000, 0x400, BAD_DUMP CRC(e3397d9d) SHA1(490a0c834b0da392daf782edc7d51ca8f0668b1a)) ROM_LOAD( "cos40b-m_1c00-1dff.bin", 0x1400, 0x200, BAD_DUMP CRC(0f759f44) SHA1(9689c1c1faa62c56def999cbedbbb0c8d928dcff)) // chargen ROM is undumped, afaik ROM_REGION( 0x1680, "chargen", 0 ) ROM_LOAD( "ch3.raw", 0x0000, 0x1680, BAD_DUMP CRC(c223622b) SHA1(185ef24896419d7ff46f71a760ac217de3811684)) ROM_END /* Driver */ COMP(1978, rm380z, 0, 0, rm380z, rm380z, driver_device, 0, "Research Machines", "RM-380Z", MACHINE_NO_SOUND_HW)