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authorGravatarGravatar Vas Crabb <vas@vastheman.com>2017-02-07 18:19:57 +1100
committerGravatarGravatar Vas Crabb <vas@vastheman.com>2017-02-07 18:19:57 +1100
commitb66f8a83b075bebbd252163052a22f0ecf071c71 (patch) (github)
tree31a83815be5dd05da28b26f53e243291345b6d6b /src/mame/drivers/osborne1.cpp
parent7433329168b130b3e3a0373dabbb19dffa122075 (diff)
downloadmame-b66f8a83b075bebbd252163052a22f0ecf071c71.tar.bz2
mame-b66f8a83b075bebbd252163052a22f0ecf071c71.zip
Add Osborne 1 with Nuevo Video board. Marked not working as scrolling
isn't implemented. New NOT_WORKING clones: ----------------------- Osborne-1 (Nuevo Video) [Vas Crabb, NekoEd]
Diffstat (limited to 'src/mame/drivers/osborne1.cpp')
-rw-r--r--src/mame/drivers/osborne1.cpp90
1 files changed, 78 insertions, 12 deletions
diff --git a/src/mame/drivers/osborne1.cpp b/src/mame/drivers/osborne1.cpp
index 99b68229b14..8482c84e683 100644
--- a/src/mame/drivers/osborne1.cpp
+++ b/src/mame/drivers/osborne1.cpp
@@ -58,6 +58,23 @@ Schematics specify a WD1793 floppy controller, but we're using the Fujitsu
equivalent MB8877 here. Is it known that the original machines used one or
the other exclusively? In any case MAME emulates them identically.
+The installing the SCREEN-PAC requires the CPU and character generator ROM
+to be transplanted to the add-on board, and cables run to the sockets that
+previously held these chips. It contains additional RAM clocked at twice
+the speed of the main system RAM. Writes to video memory get sent to this
+RAM as well as the main system RAM, so there are actually two live copies
+of video RAM at all times. The SCREEN-PAC supports switching between
+normal and double horizontal resolution (52x24 or 104x24) at exactly 60Hz.
+
+The Nuevo Video board also requires the CPU to be transplanted to it and has
+a pair of RAMs holding a copy of video memory. However it has its own
+character generator ROM, so the mainboard's character generator ROM doesn't
+need to be moved. However, it doesn't behave like the SCREEN-PAC. It uses
+a Synertek SY6545-1 with its pixel clock derived from a 12.288MHz crystal
+mapped at 0x04/0x05 in I/O space. It runs at 640x240 (80x24) at just below
+60Hz. We don't know how video RAM contention on video RAM is handled, how
+scrolling works, or whether the CRTC can generate VBL interrupts.
+
TODO:
@@ -66,12 +83,19 @@ TODO:
Centronics parallel over the same physical interface, so this should be
tested, too.
+* Fix emulation of the Nuevo Video board (scrolling, interrupts, CRTC video
+ RAM updates). It would be nice to get a schematic for this.
+
***************************************************************************/
+#include "emu.h"
#include "includes/osborne1.h"
+
#include "bus/rs232/rs232.h"
+
#include "softlist.h"
+
#define MAIN_CLOCK 15974400
@@ -92,9 +116,20 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START( osborne1_io, AS_IO, 8, osborne1_state )
ADDRESS_MAP_UNMAP_HIGH
ADDRESS_MAP_GLOBAL_MASK(0xff)
+
AM_RANGE( 0x00, 0x03 ) AM_MIRROR( 0xfc ) AM_WRITE(bankswitch_w)
ADDRESS_MAP_END
+static ADDRESS_MAP_START( osborne1nv_io, AS_IO, 8, osborne1_state )
+ ADDRESS_MAP_UNMAP_HIGH
+ ADDRESS_MAP_GLOBAL_MASK(0xff)
+
+ AM_RANGE( 0x00, 0x03 ) AM_WRITE(bankswitch_w)
+ AM_RANGE( 0x04, 0x04 ) AM_DEVREADWRITE("crtc", mc6845_device, status_r, address_w)
+ AM_RANGE( 0x05, 0x05 ) AM_DEVREADWRITE("crtc", mc6845_device, register_r, register_w)
+ // seems to be something at 0x06 as well, but no idea what
+ADDRESS_MAP_END
+
static INPUT_PORTS_START( osborne1 )
PORT_START("ROW0")
@@ -201,6 +236,13 @@ static INPUT_PORTS_START( osborne1 )
PORT_CONFSETTING(0x01, "SCREEN-PAC")
INPUT_PORTS_END
+INPUT_PORTS_START( osborne1nv )
+ PORT_INCLUDE(osborne1)
+
+ PORT_MODIFY("CNF")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_UNUSED)
+INPUT_PORTS_END
+
/*
* The Osborne-1 supports the following disc formats:
@@ -296,28 +338,52 @@ static MACHINE_CONFIG_START( osborne1, osborne1_state )
MCFG_SOFTWARE_LIST_ADD("flop_list","osborne1")
MACHINE_CONFIG_END
+MACHINE_CONFIG_DERIVED_CLASS( osborne1nv, osborne1, osborne1nv_state )
+ MCFG_CPU_MODIFY("maincpu")
+ MCFG_CPU_IO_MAP(osborne1nv_io)
+
+ MCFG_SCREEN_MODIFY("screen")
+ MCFG_SCREEN_NO_PALETTE
+ MCFG_SCREEN_UPDATE_DEVICE("crtc", mc6845_device, screen_update)
+
+ MCFG_MC6845_ADD("crtc", SY6545_1, "screen", XTAL_12_288MHz/8)
+ MCFG_MC6845_SHOW_BORDER_AREA(false)
+ MCFG_MC6845_CHAR_WIDTH(8)
+ MCFG_MC6845_UPDATE_ROW_CB(osborne1nv_state, crtc_update_row)
+ MCFG_MC6845_ADDR_CHANGED_CB(osborne1nv_state, crtc_update_addr_changed)
+MACHINE_CONFIG_END
+
ROM_START( osborne1 )
- ROM_REGION(0x1000, "maincpu", 0)
+ ROM_REGION( 0x1000, "maincpu", 0 )
ROM_SYSTEM_BIOS( 0, "ver144", "BIOS version 1.44" )
- ROMX_LOAD( "3a10082-00rev-e.ud11", 0x0000, 0x1000, CRC(c0596b14) SHA1(ee6a9cc9be3ddc5949d3379351c1d58a175ce9ac), ROM_BIOS(1) )
+ ROMX_LOAD( "3a10082-00rev-e.ud11", 0x0000, 0x1000, CRC(c0596b14) SHA1(ee6a9cc9be3ddc5949d3379351c1d58a175ce9ac), ROM_BIOS(1) )
ROM_SYSTEM_BIOS( 1, "verA", "BIOS version A" )
- ROMX_LOAD( "osba.bin", 0x0000, 0x1000, NO_DUMP, ROM_BIOS(2) )
+ ROMX_LOAD( "osba.bin", 0x0000, 0x1000, NO_DUMP, ROM_BIOS(2) )
ROM_SYSTEM_BIOS( 2, "ver12", "BIOS version 1.2" )
- ROMX_LOAD( "osb12.bin", 0x0000, 0x1000, NO_DUMP, ROM_BIOS(3) )
+ ROMX_LOAD( "osb12.bin", 0x0000, 0x1000, NO_DUMP, ROM_BIOS(3) )
ROM_SYSTEM_BIOS( 3, "ver121", "BIOS version 1.2.1" )
- ROMX_LOAD( "osb121.bin", 0x0000, 0x1000, NO_DUMP, ROM_BIOS(4) )
+ ROMX_LOAD( "osb121.bin", 0x0000, 0x1000, NO_DUMP, ROM_BIOS(4) )
ROM_SYSTEM_BIOS( 4, "ver13", "BIOS version 1.3" )
- ROMX_LOAD( "osb13.bin", 0x0000, 0x1000, NO_DUMP, ROM_BIOS(5) )
- ROM_SYSTEM_BIOS( 5, "ver14", "BISO version 1.4" )
- ROMX_LOAD( "rev1.40.ud11", 0x0000, 0x1000, CRC(3d966335) SHA1(0c60b97a3154a75868efc6370d26995eadc7d927), ROM_BIOS(6) )
- ROM_SYSTEM_BIOS( 6, "ver143", "BIOS version 1.43" )
- ROMX_LOAD( "rev1.43.ud11", 0x0000, 0x1000, CRC(91a48e3c) SHA1(c37b83f278d21e6e92d80f9c057b11f7f22d88d4), ROM_BIOS(7) )
+ ROMX_LOAD( "osb13.bin", 0x0000, 0x1000, NO_DUMP, ROM_BIOS(5) )
+ ROM_SYSTEM_BIOS( 5, "ver14", "BIOS version 1.4" )
+ ROMX_LOAD( "rev1.40.ud11", 0x0000, 0x1000, CRC(3d966335) SHA1(0c60b97a3154a75868efc6370d26995eadc7d927), ROM_BIOS(6) )
+ ROM_SYSTEM_BIOS( 6, "ver143", "BIOS version 1.43" )
+ ROMX_LOAD( "rev1.43.ud11", 0x0000, 0x1000, CRC(91a48e3c) SHA1(c37b83f278d21e6e92d80f9c057b11f7f22d88d4), ROM_BIOS(7) )
+
ROM_REGION( 0x800, "chargen", 0 )
ROM_LOAD( "7a3007-00.ud15", 0x0000, 0x800, CRC(6c1eab0d) SHA1(b04459d377a70abc9155a5486003cb795342c801) )
//ROM_LOAD( "char.ua15", 0x0000, 0x800, CRC(5297C109) SHA1(e1a59d87edd66e6c226102cb0688e9cb74dbb594) ) // this is CHRROM from v1.4 BIOS MB. I don't know how to hook up diff CHR to ROM_BIOS(6)
+ROM_END
+ROM_START( osborne1nv )
+ ROM_REGION(0x1000, "maincpu", 0)
+ ROM_LOAD( "monrom-rev1.51-12.ud11", 0x0000, 0x1000, CRC(298da402) SHA1(7fedd070936ccfe98f96d6e0ac71689666da79cb) )
+
+ ROM_REGION( 0x0800, "chargen", 0 )
+ ROM_LOAD( "7a3007-00.ud15", 0x0000, 0x800, CRC(6c1eab0d) SHA1(b04459d377a70abc9155a5486003cb795342c801) )
ROM_END
-/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
-COMP( 1981, osborne1, 0, 0, osborne1, osborne1, osborne1_state, osborne1, "Osborne", "Osborne-1", MACHINE_SUPPORTS_SAVE )
+/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
+COMP( 1981, osborne1, 0, 0, osborne1, osborne1, osborne1_state, osborne1, "Osborne", "Osborne-1", MACHINE_SUPPORTS_SAVE )
+COMP( 1984, osborne1nv, osborne1, 0, osborne1nv, osborne1nv, osborne1_state, osborne1, "Osborne/Nuevo", "Osborne-1 (Nuevo Video)", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE )