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author Scott Stone <tafoid@users.noreply.github.com>2014-04-27 17:42:42 +0000
committer Scott Stone <tafoid@users.noreply.github.com>2014-04-27 17:42:42 +0000
commit121359ecbca70ad940731af021a17631f4030ea1 (patch)
tree4cf003336a1889acc1f3a3607ba4d0f899304ee0 /src/mess/drivers/rainbow.c
parent32f39026a174154159b7da84103156cd2603aad1 (diff)
(MESS) RAINBOW.C: IRQ priorities updated. Board revisions and add-on cards documented; rainbow100 renamed to rainbow100a. [Bavarese]
Diffstat (limited to 'src/mess/drivers/rainbow.c')
-rw-r--r--src/mess/drivers/rainbow.c156
1 files changed, 99 insertions, 57 deletions
diff --git a/src/mess/drivers/rainbow.c b/src/mess/drivers/rainbow.c
index 603fb837859..052be9d847d 100644
--- a/src/mess/drivers/rainbow.c
+++ b/src/mess/drivers/rainbow.c
@@ -2,16 +2,16 @@
DEC Rainbow 100
Driver-in-progress by R. Belmont and Miodrag Milanovic.
- Portions (2013-2014) by Karl-Ludwig Deisenhofer (VT video, preliminary floppy, keyboard, DIP switches).
+ Portions (2013-2014) by Karl-Ludwig Deisenhofer (VT attributes, preliminary floppy, keyboard, DIP switches).
- STATE AS OF MARCH 2014
+ STATE AS OF APRIL 2014
----------------------
Driver is based entirely on the DEC-100 'B' variant (DEC-190 and DEC-100 A models are treated as clones).
While this is OK for the compatible -190, it doesn't do justice to ancient '100 A' hardware.
Currently, there are 2 showstoppers:
(1) IRQ logic for 100-B needs further work (text in RBCONVERT.ZIP has details concerning -A versus -B)
- (2) Keyboard emulation incomplete (inhibits the system from booting with ERROR 50 on cold or ERROR 13 on warm boot).
+ (2) Keyboard emulation incomplete (inhibits the system from booting with ERROR 50).
- FLOPPY TIMING: 'wd17xx_complete_command' * must * be hard wired to about 13 usecs.
Line 1063 in 'wd17xx.c' has to be changed (until legacy code here is removed):
@@ -21,24 +21,35 @@
- NOT WORKING: serial (ERROR 60).
- NOT WORKING: printer interface (ERROR 40). Like error 60 not mission-critical.
- - NON-CRITICAL: watchdog logic (triggered after 108 ms without interrupts on original machine) still does not work as intended.
+ - NON-CRITICAL: watchdog logic ('MHFU' triggered after 108 ms without interrupts on original machine) does not work.
+ The timer is reset by TWO sources: the VERT INT L from the DC012, or the MHFU ENB L from the enable flip-flop.
+ MHFU gets active if the 8088 has not acknowledged a video processor interrupt within approx. 108 milliseconds
- Timer is reset by TWO sources: the VERT INT L from the DC012, or the MHFU ENB L from the enable flip-flop.
- The MHFU gets active if the 8088 has not acknowledged a video processor interrupt within approx. 108 milliseconds.
-
- BIOS assumes a power-up reset if MHFU detection is disabled - and assumes a MHFU reset if MHFU detection is ENABLED.
-
- As there is no reset switch, only a limited software reset exists on a real DEC-100 (CTRL-SETUP within SETUP).
+ - FIXME: warm boot triggers ERROR 16 (watchdog). BIOS assumes proper power-up only if MHFU detection is _disabled_
+ Apart from power-cycling, Ctrl-Setup (within SETUP) appears to be the only way to reboot the DEC-100.
- TO BE IMPLEMENTED AS SLOT DEVICES (for now, DIP settings affect 'system_parameter_r' only and are disabled):
- * Color graphics option (uses NEC upd7220 GDC)
- * Extended communication option (same as BUNDLE_OPTION ?)
+ * Color graphics option (uses NEC upd7220 GDC). REFERENCE: Programmer's Reference: AA-AE36A-TV.
+ Either 384 x 240 x 16 or 800 x 240 x 4 colors (out of 4096). 8 64 K video RAM. Pallette limited to 4 colors on 100-A.
+
+ * Extended communication option (1 of 4 possible BUNDLE_OPTIONs) REFERENCE: AA-V172A-TV + Addendum AV-Y890A-TV.
+ See also NEWCOM1.DOC in RBETECDOC.ZIP. Board connected to the front rightmost expansion slot (1 of the expansion
+ ports used by the hard disk controller). Thus can't be added to a system that includes the DEC RD50/51.
+ => 2 ports, a high-speed RS-422 half-duplex interface (port A) + lower-speed RS-423 full/half-duplex interface
+ with modem control (port B). A DMA mode allowed high-speed transfer of data into and out of the Rainbow's memory.
- OTHER HARDWARE UPGRADES:
- * Suitable Solutions ClikClok (real time clock)
+ * Suitable Solutions ClikClok (battery backed real time clock)
+ Plugs into the NVM chip socket on a 100-A and into the Boot ROM on the 100-B (there is a socket
+ on the ClikClok for the NVM / ROM chip). Came with software for 'all versions of MS-DOS'.
+
+ * 8087 Numerical Data Coprocessor daughterboard. REFERENCE: EK-PCNDP-IN-PRE
+ Daughterboard, to be plugged into the expansion port where the memory expansion card usually sits.
+ If a memory adapter board is present, it has to be plugged into a connector atop the 8087 copro board.
+ The 8088 is put into the CPU socket on the coprocessor board.
* Suitable Solutions TURBOW286: 12 Mhz, 68-pin, low power AMD N80L286-12 and WAYLAND/EDSUN EL286-88-10-B ( 80286 to 8088 Processor Signal Converter )
- plus DC 7174 or DT 7174 (barely readable). Add-on card, replaces main 8088 cpu (via ribbon cable). Altered BOOT ROM labeled 'TBSS1.3 - 3ED4'.
+ plus DC 7174 or DT 7174 (barely readable). Add-on card, replaces main 8088 cpu (via ribbon cable). Patched 5.0x BOOT ROM labeled 'TBSS1.3 - 3ED4'.
* NEC_V20 (requires modded BOOT ROM because of - at least 2 - hard coded timing loops):
100A: 100B/100+: 100B+ ALTERNATE RECOMMENDATION (fixes RAM size auto-detection problems when V20 is in place.
@@ -184,8 +195,8 @@ W17 pulls J1 serial port pin 1 to GND when set (chassis to logical GND).
// EK-PC100-PS-002 (APPENDIX B.2.2); pc100ps2.pdf
-// Workaround DOES NOT APPLY to the 190-B ROM. Only enable when compiling the 'rainbow' driver -
-//#define FORCE_RAINBOW_100_LOGO
+// Workaround not valid for 100-A -
+//#define FORCE_RAINBOW_B_LOGO
#include "emu.h"
#include "cpu/i86/i86.h"
@@ -283,10 +294,14 @@ protected:
private:
enum
{
- IRQ_8088_MAILBOX = 0, // vector 0x27/a7
- IRQ_8088_VBL, // vector 0x20/a0
- IRQ_8088_KBD, // vector 0x26/a6
-
+ IRQ_8088_MAILBOX = 0, // vector 0x27/a7 (lowest priority)
+ IRQ_8088_KBD, // vector 0x26/a6 KEYBOARD (8251A) Interrupt
+// IRQ_EXT_COMM, // vector 0x25 [OPTION BOARD] Interrupt from external COMM.BOARD (non DMA)
+// IRQ_COMM_PRN_7201, // vector 0x24 COMM./PRINTER (7201) IRQ
+// IRQ_EXT_DMAC, // vector 0x23 [OPTION BOARD] : from external COMM.BOARD (DMA Control IRQ)
+// IRQ_GRF, // vector 0x22 GRAPHICS IRQ
+// IRQ_SH_10_BDL, // vector 0x21 BUNDLE IRQ (hard disc / COMM.BOARD) : Pin 23 of expansion connector J4
+ IRQ_8088_VBL, // vector 0x20/a0 (highest priority)
IRQ_8088_MAX
};
@@ -368,14 +383,19 @@ void rainbow_state::machine_start()
save_item(NAME(m_irq_high));
save_item(NAME(m_irq_mask));
-#ifdef FORCE_RAINBOW_100_LOGO
+#ifdef FORCE_RAINBOW_B_LOGO
UINT8 *rom = memregion("maincpu")->base();
- rom[0xf4174]=0xeb; // jmps RAINBOW100_LOGO__loc_33D
- rom[0xf4175]=0x08;
+ if (rom[0xf4174] == 0x75)
+ { rom[0xf4174] = 0xeb; // jmps RAINBOW100_LOGO__loc_33D
+ rom[0xf4175] = 0x08;
+ }
+
+ if (rom[0xf4000 + 0x3ffc] == 0x31) // 100-B
+ rom[0xf4384] = 0xeb; // JMPS => BOOT80
- rom[0xf4000 + 0x364a]= 0x0a;
- rom[0xf4384]=0xeb; // JMPS => BOOT80
+ if (rom[0xf4000 + 0x3ffc] == 0x35) // v5.05
+ rom[0xf437b] = 0xeb;
#endif
}
@@ -411,7 +431,6 @@ static ADDRESS_MAP_START( rainbow8088_io , AS_IO, 8, rainbow_state)
// 0x02 Communication status / control register (8088)
AM_RANGE (0x02, 0x02) AM_READWRITE(comm_control_r, comm_control_w)
- // 0x04 Video processor DC011
AM_RANGE (0x04, 0x04) AM_DEVWRITE("vt100_video", rainbow_video_device, dc011_w)
// TODO: unmapped [06] : Communication bit rates (see page 21 of PC 100 SPEC)
@@ -420,7 +439,6 @@ static ADDRESS_MAP_START( rainbow8088_io , AS_IO, 8, rainbow_state)
AM_RANGE (0x0a, 0x0a) AM_READWRITE(diagnostic_r, diagnostic_w)
- // 0x0C Video processor DC012
AM_RANGE (0x0c, 0x0c) AM_DEVWRITE("vt100_video", rainbow_video_device, dc012_w)
// TODO: unmapped [0e] : PRINTER BIT RATE REGISTER (WO)
@@ -429,22 +447,41 @@ static ADDRESS_MAP_START( rainbow8088_io , AS_IO, 8, rainbow_state)
AM_RANGE(0x11, 0x11) AM_DEVREADWRITE("kbdser", i8251_device, status_r, control_w)
// UNMAPPED:
- // 0x20 - 0x2f ***** EXTENDED COMM. OPTION (option select 1)- for example:
- // 0x27 (RESET EXTENDED COMM OPTION) - OUT 27 @ offset 1EA7
-
- // 0x40 COMMUNICATIONS DATA REGISTER (MPSC)
+ // 0x20 - 0x2f ***** EXTENDED COMM. OPTION (option select 1)
+ // 0x27 (RESET EXTENDED COMM OPTION - - see boot ROM @1EA6)
+ // ===========================================================
+ // 0x40 COMMUNICATIONS DATA REGISTER (MPSC)
// 0x41 PRINTER DATA REGISTER (MPSC)
// 0x42 COMMUNICATIONS CONTROL / STATUS REGISTER (MPSC)
// 0x43 PRINTER CONTROL / STATUS REGISTER (MPSC)
+ // ===========================================================
+ // 0x50 - 0x57 ***** COLOR GRAPHICS OPTION:
+ // 50h Graphics option software reset. Any write to this
+ // port also resynchronizes the read/modify/write memory
+ // cycles of the Graphics Option to those of the GDC (*)
+ // * see boot ROM @1EB4/8
+ // 51h Data written to this port is loaded into the area
+ // selected by the previous write to port 53h.
+
+ // 52h Data written to this port is loaded into the Write Buffer.
- // 0x50 - 0xf ***** OPTIONAL COLOR GRAPHICS - for example:
- // 0x50 (RESET_GRAPH. OPTION) - OUT 50 @ offsets F5EB5 + F5EB9
+ // 53h Data written to this port provides address selection
+ // for indirect addressing (see Indirect Register).
+ // 54h Data written to this port is loaded into the low-order
+ // byte of the Write Mask.
+
+ // 55h Data written to this port is loaded into the high-order
+ // byte of the Write Mask.
+
+ // 56h Data written to this port is loaded into the GDC's FIFO
+ // Buffer and flagged as a parameter.
// ===========================================================
// TODO: hard disc emulation!
// ------ Rainbow uses 'WD 1010 AL' (Western Digital 1983)
// Register compatible to WD2010 (present in MESS)
// R/W REGISTERS 60 - 68 (?)
+ AM_RANGE (0x68, 0x68) AM_READ(hd_status_68_r)
// ===========================================================
// HARD DISC SIZES AND LIMITS
// HARDWARE:
@@ -455,7 +492,6 @@ static ADDRESS_MAP_START( rainbow8088_io , AS_IO, 8, rainbow_state)
// SOFTWARE:
// - MS-DOS 2 allows a maximum partition size of 16 MB (sizes > 15 MB are incompatible to DOS 3)
// - MS-DOS 3 has a global 1024 cylinder limit (32 MB).
- AM_RANGE (0x68, 0x68) AM_READ(hd_status_68_r)
ADDRESS_MAP_END
static ADDRESS_MAP_START(rainbowz80_mem, AS_PROGRAM, 8, rainbow_state)
@@ -490,7 +526,7 @@ static INPUT_PORTS_START( rainbow100b_in )
PORT_START("MEMORY PRESENT")
PORT_DIPNAME( 0xF0000, 0x20000, "MEMORY PRESENT")
PORT_DIPSETTING( 0x10000, "64 K (MINIMUM ON 100-A)" ) // see BOARD_RAM
- PORT_DIPSETTING( 0x20000, "128 K (MINIMUM ON 100-B)" )
+ PORT_DIPSETTING( 0x20000, "128 K (MINIMUM ON 100-B)" )
PORT_DIPSETTING( 0x30000, "192 K (MEMORY OPTION)" )
PORT_DIPSETTING( 0x40000, "256 K (MEMORY OPTION)" )
PORT_DIPSETTING( 0x50000, "320 K (MEMORY OPTION)" )
@@ -507,8 +543,11 @@ static INPUT_PORTS_START( rainbow100b_in )
// Floppy is always 'on', BUNDLE + GRAPHICS are not implemented yet:
PORT_START("FLOPPY CONTROLLER")
PORT_DIPNAME( 0x01, 0x01, "FLOPPY CONTROLLER") PORT_TOGGLE
- PORT_DIPSETTING( 0x01, DEF_STR( On ) )
+ PORT_DIPSETTING( 0x01, DEF_STR( On ) )
+ // BUNDLE_OPTION: COMM.card or hard disc controller extension (marketed later).
+ // NOTES: - hard disc and COMM.extension exclude each other.
+ // - connector J4 has 4 select lines. Select option 1 = COMM CARD ?
PORT_START("BUNDLE OPTION")
PORT_DIPNAME( 0x00, 0x00, "BUNDLE OPTION") PORT_TOGGLE
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
@@ -518,9 +557,9 @@ static INPUT_PORTS_START( rainbow100b_in )
PORT_DIPNAME( 0x00, 0x00, "GRAPHICS OPTION") PORT_TOGGLE
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x01, DEF_STR( On ) )
-
+
// W13 - W18 are used for factory tests and affect the boot process -
- PORT_START("W13")
+ PORT_START("W13")
PORT_DIPNAME( 0x02, 0x02, "W13 (FACTORY TEST A, LEAVE OFF)") PORT_TOGGLE
PORT_DIPSETTING( 0x02, DEF_STR( Off ) )
PORT_DIPSETTING( 0x00, DEF_STR( On ) )
@@ -569,7 +608,7 @@ void rainbow_state::machine_reset()
{
/* configure RAM */
address_space &program = m_maincpu->space(AS_PROGRAM);
- if (m_inp8->read() < END_OF_RAM)
+ if (m_inp8->read() < END_OF_RAM)
{ program.unmap_readwrite(m_inp8->read(), END_OF_RAM);
}
@@ -628,10 +667,10 @@ UINT32 rainbow_state::screen_update_rainbow(screen_device &screen, bitmap_ind16
return 0;
}
-// interrupt handling and arbitration. priorities currently unknown.
+// Interrupt handling and arbitration. See 3.1.3.8 OF PC-100 spec.
void rainbow_state::update_8088_irqs()
{
- static const int vectors[] = { 0x27, 0x20, 0x26 };
+ static const int vectors[] = { 0x27, 0x26, 0x20 };
if (m_irq_mask != 0)
{
@@ -732,16 +771,17 @@ READ8_MEMBER(rainbow_state::hd_status_68_r)
READ8_MEMBER(rainbow_state::system_parameter_r)
{
/* Info about option boards is in bits 0 - 3:
+ SYSTEM PARAMETER INFORMATION: see AA-P308A-TV page 92 section 14.0
Bundle card (1) | Floppy (2) | Graphics (4) | Memory option (8)
-
0 1 2 3 4 5 6 7
B F G M
- ( 1 means NOT present )
+ ( 1 means NOT present; 4-7 reserved )
*/
- return (((m_inp5->read() == 1) ? 0 : 1) |
+ return ( ((m_inp5->read() == 1) ? 0 : 1) |
((m_inp6->read() == 1) ? 0 : 2) |
((m_inp7->read() == 1) ? 0 : 4) |
- ((m_inp8->read() > BOARD_RAM) ? 0 : 8)
+ ((m_inp8->read() > BOARD_RAM) ? 0 : 8) |
+ 16 | 32 | 64 | 128 // to be verified.
);
}
@@ -1007,7 +1047,9 @@ WRITE_LINE_MEMBER( rainbow_state::clear_video_interrupt )
lower_8088_irq(IRQ_8088_VBL);
}
-READ8_MEMBER( rainbow_state::diagnostic_r )
+
+
+READ8_MEMBER( rainbow_state::diagnostic_r ) // 8088 (port 0A READ). Fig.4-29 + table 4-15
{
// printf("%02x DIP value ORed to diagnostic\n", ( m_inp1->read() | m_inp2->read() | m_inp3->read() ) );
@@ -1018,7 +1060,7 @@ READ8_MEMBER( rainbow_state::diagnostic_r )
);
}
-WRITE8_MEMBER( rainbow_state::diagnostic_w )
+WRITE8_MEMBER( rainbow_state::diagnostic_w ) // 8088 (port 0A WRITTEN). Fig.4-28 + table 4-15
{
// printf("%02x to diag port (PC=%x)\n", data, space.device().safe_pc());
m_SCREEN_BLANK = (data & 2) ? false : true;
@@ -1058,7 +1100,6 @@ WRITE8_MEMBER( rainbow_state::diagnostic_w )
// reset device when going from high to low,
// restore command when going from low to high :
m_fdc->mr_w((data & 1) ? 1 : 0);
-
m_diagnostic = data;
}
@@ -1076,7 +1117,6 @@ void rainbow_state::update_kbd_irq()
}
}
-
WRITE_LINE_MEMBER(rainbow_state::kbd_tx)
{
// printf("%02x to keyboard\n", state);
@@ -1225,7 +1265,8 @@ static MACHINE_CONFIG_START( rainbow, rainbow_state )
MCFG_NVRAM_ADD_0FILL("nvram")
MACHINE_CONFIG_END
-// 'Rainbow 100-A' (introduced May 1982) is first-generation hardware with ROM 04.03.11
+// 'Rainbow 100-A' (system module 70-19974-00, PSU H7842-A)
+// - first generation hardware (introduced May '82) with ROM 04.03.11
// - 64 K base RAM on board (instead of 128 K on 'B' model). 832 K RAM max.
// - inability to boot from hard disc (mind the inadequate PSU)
// - cannot control bit 7 of IRQ vector (prevents DOS >= 2.05 from booting on unmodified hardware)
@@ -1234,7 +1275,7 @@ MACHINE_CONFIG_END
// FIXME: 12-19606-02 and 12-19678-04 are just PART NUMBERS from the 100-A field manual.
// Someone who knows the DEC naming conventions should correct them -
-ROM_START( rainbow100 )
+ROM_START( rainbow100a )
ROM_REGION(0x100000,"maincpu", 0)
ROM_LOAD( "12-19606-02a.bin", 0xFA000, 0x2000, NO_DUMP) // ROM (FA000-FBFFF) (E89) 8 K
ROM_LOAD( "12-19606-02b.bin", 0xFC000, 0x2000, NO_DUMP) // ROM (FC000-FDFFF) (E90) 8 K
@@ -1244,7 +1285,10 @@ ROM_START( rainbow100 )
ROM_LOAD( "chargen.bin", 0x0000, 0x1000, CRC(1685e452) SHA1(bc299ff1cb74afcededf1a7beb9001188fdcf02f))
ROM_END
-// ROM definition for 100-B (different revisions built until ~ May 1986; see MP-01491-00)
+// ROM definition for 100-B (system module 70-1994-02, PSU H7842-D)
+// Built until ~ May 1986 (see MP-01491-00)
+// - 32 K ROM (version 5.03)
+// - 128 K base and 896 K max. mem.
ROM_START( rainbow )
ROM_REGION(0x100000,"maincpu", 0)
ROM_LOAD( "23-022e5-00.bin", 0xf0000, 0x4000, CRC(9d1332b4) SHA1(736306d2a36bd44f95a39b36ebbab211cc8fea6e))
@@ -1262,11 +1306,9 @@ ROM_END
// 'Rainbow 190 B' (announced March 1985) is identical to 100-B, with alternate ROM v5.05.
// According to an article in Wall Street Journal it came with a 10 MB HD and 640 K RAM.
-// We have no version history. The BOOT 2.4 README reveals 'recent ROM changes for MASS 11'
-// in January 1985. These were not present in the older version 04.03.11 (for PC-100-A)
-// and also not in version 05.03 (from PC-100B / PC100B+).
+// CHANGES: the 'Boot 2.4' manual mentions 'recent ROM changes for MASS 11' in January 1985.
+// Older ROMs like 04.03.11 (for PC-100-A) or 05.03 (100-B) obviously do not incorporate these.
-// A first glance:
// => jump tables (F4000-F40083 and FC000-FC004D) were not extended.
// => absolute addresses of some internal routines have changed.
// => programs that do not rely on specific ROM versions should be compatible.
@@ -1287,6 +1329,6 @@ ROM_END
/* Driver */
/* YEAR NAME PARENT COMPAT MACHINE INPUT STATE INIT COMPANY FULLNAME FLAGS */
-COMP( 1982, rainbow100 , rainbow, 0, rainbow, rainbow100b_in, driver_device, 0, "Digital Equipment Corporation", "Rainbow 100-A", GAME_IS_SKELETON )
+COMP( 1982, rainbow100a , rainbow, 0, rainbow, rainbow100b_in, driver_device, 0, "Digital Equipment Corporation", "Rainbow 100-A", GAME_IS_SKELETON )
COMP( 1983, rainbow , 0 , 0, rainbow, rainbow100b_in, driver_device, 0, "Digital Equipment Corporation", "Rainbow 100-B", GAME_NOT_WORKING | GAME_IMPERFECT_COLORS)
COMP( 1985, rainbow190 , rainbow, 0, rainbow, rainbow100b_in, driver_device, 0, "Digital Equipment Corporation", "Rainbow 190-B", GAME_NOT_WORKING | GAME_IMPERFECT_COLORS)