mirror of
https://github.com/holub/mame
synced 2025-10-06 09:00:04 +03:00
(nw) icebox : last update for this cycle.
This commit is contained in:
Robbbert
parent
876d1402a5
commit
9e6b57b057
@ -6,10 +6,10 @@ Nutting Icebox
|
||||
|
||||
2018-08-19 Skeleton driver. It's all guesswork.
|
||||
|
||||
It's a case with many slots for daughter boards, and 2 floppy drives. It appears to be an "in-circuit emulator"
|
||||
for an unknown arcade board.
|
||||
It's a case with many slots for daughter boards, and 2 floppy drives. It's an "in-circuit emulator"
|
||||
for Bally / Astrocade development.
|
||||
|
||||
The unit has 5 boards: 3 boards were photographed and are: a cpu board (Z80 and unmarked XTAL),
|
||||
The unit has 5 daughter boards: 3 boards were photographed and are: a cpu board (Z80 and unmarked XTAL),
|
||||
a RS232 board (2x 8251, 8 dipswitches connected to a BR1941L, 4.9152 XTAL),
|
||||
and a board covered with TTL.
|
||||
|
||||
@ -25,14 +25,80 @@ Commands:
|
||||
|
||||
Status:
|
||||
- Machine boots up, you can enter commands.
|
||||
- Disk track 00 can be read into memory, hangs when track 01 is requested.
|
||||
- Note that disk won't actually do anything until Z-80 IM0 is fixed.
|
||||
|
||||
To Do:
|
||||
- Find out what ports E4-FF do.
|
||||
- Hook up the floppy drives when the ports are identified.
|
||||
- Find out more what ports F2-FF do.
|
||||
|
||||
The floppy drives are a special type containing a FDC within. The FDC is a FD1771-B01 with a 4MHz XTAL.
|
||||
I suspect the drive issues a NMI when the internal DRQ asserts (code around F21C). Need to resolve how
|
||||
it handles writing data to 0000-up while keeping the NMI handler.
|
||||
|
||||
|
||||
NOTES FROM AL KOSSOW
|
||||
--------------------
|
||||
|
||||
This is the Nutting Associates ICE box used for Bally arcade and Astrocade development.
|
||||
|
||||
The games are written in "Terse", a dialect of FORTH with graphics and sound extensions.
|
||||
|
||||
The game graphics and sound hardware were in a separate chassis connected through 50 pin ribbon cables.
|
||||
There is 64K of ram that can be mapped to the addresses used where the proms in the game would be.
|
||||
|
||||
Development appeared to have started under CP/M, then they migrated to development in the Terse environment.
|
||||
The sector size also changed from 128 to 1024 bytes. For some reason, the hardware inverts the sector data.
|
||||
CP/M flipped the bits, Terse does not.
|
||||
|
||||
There is a 122 pin backplane, and five cards. The bus buffers for the floppies and the external hardware
|
||||
are on the backplane. There is an I/O, memory mapper, dual 32k static ram, and CPU cards. The I/O card has
|
||||
a three byte FIFO and a buffer for forcing 00 onto the data bus, which appears to be related to handling
|
||||
breakpoints from looking at the code in ICE.ASM.
|
||||
|
||||
The eprom dump is for booting Terse, and earlier version of the prom is documented in ICE.ASM which may be for CP/M
|
||||
|
||||
The CPU card has 1K of ram, mapped to FC00. They must have moved the sector buffering to main RAM, since a
|
||||
1K sector obviously wouldn't fit.
|
||||
|
||||
The crystal on the CPU is 9.8304MHz. It may be possible to alter the cpu speed. There is a FAST signal on the bp.
|
||||
|
||||
I/O registers from the ICE.ASM listing
|
||||
|
||||
CRTD E0 terminal uart data
|
||||
CRTS E1 terminal uart control
|
||||
LPTD E2 printer uart data
|
||||
LPTS E3 printer uart control
|
||||
|
||||
DATA E4 1771 regs
|
||||
SECTOR E5
|
||||
TRACK E6
|
||||
COMMAND E7
|
||||
|
||||
CENABE F0
|
||||
SELECT F1 bit 0 & 1 (select drive 0-3), bit 2 (enable floppy interrupt)
|
||||
FIFO F2 3 BYTE FIFO
|
||||
|
||||
EXTL F8 These are probably for the mapping registers
|
||||
EXTH F9
|
||||
|
||||
WPROTL FA
|
||||
WPROTH FB
|
||||
|
||||
BADRH FC BASE ADR? breakpoint
|
||||
BADRL FD
|
||||
|
||||
BTYPE FE
|
||||
MISC FF
|
||||
|
||||
the 0 is forced onto the bus when bp signal IRESET/ is asserted. it appears to come from the CPU board (only
|
||||
the cpu and io board are connected to it)
|
||||
|
||||
the box doesn't do remapping, it just has two 16 bit write-only registers that can unmap and write protect memory
|
||||
in 16 4k chunks, (extl,exth), (wprotl,wproth) .
|
||||
|
||||
breakpoint (badrh, barl) specifies an adr to nmi on, with a 4 bit reference type in btype (wr, req, iorq, mreq)
|
||||
|
||||
it looks like zeroing btype disables it.
|
||||
|
||||
io port 0xff (misc) is on the I/O board.
|
||||
|
||||
******************************************************************************************************************/
|
||||
|
||||
@ -41,8 +107,7 @@ it handles writing data to 0000-up while keeping the NMI handler.
|
||||
#include "machine/i8251.h"
|
||||
#include "machine/com8116.h"
|
||||
#include "bus/rs232/rs232.h"
|
||||
//#include "machine/wd_fdc.h"
|
||||
#include "screen.h"
|
||||
#include "machine/wd_fdc.h"
|
||||
|
||||
|
||||
class icebox_state : public driver_device
|
||||
@ -54,25 +119,35 @@ public:
|
||||
, m_uart0(*this, "uart0")
|
||||
, m_uart1(*this, "uart1")
|
||||
, m_brg(*this, "brg")
|
||||
, m_fdc(*this, "fdc")
|
||||
, m_floppy0(*this, "fdc:0")
|
||||
, m_floppy1(*this, "fdc:1")
|
||||
{ }
|
||||
|
||||
void icebox(machine_config &config);
|
||||
|
||||
private:
|
||||
DECLARE_WRITE_LINE_MEMBER(intrq_w);
|
||||
DECLARE_WRITE_LINE_MEMBER(drq_w);
|
||||
void mem_map(address_map &map);
|
||||
void io_map(address_map &map);
|
||||
void machine_reset() override;
|
||||
void port_f1_w(u8 data);
|
||||
u8 m_f1;
|
||||
|
||||
required_device<cpu_device> m_maincpu;
|
||||
required_device<i8251_device> m_uart0;
|
||||
required_device<i8251_device> m_uart1;
|
||||
required_device<com8116_device> m_brg;
|
||||
required_device<fd1771_device> m_fdc;
|
||||
required_device<floppy_connector> m_floppy0;
|
||||
required_device<floppy_connector> m_floppy1;
|
||||
};
|
||||
|
||||
|
||||
void icebox_state::mem_map(address_map &map)
|
||||
{
|
||||
map(0x0000, 0x00ff).rom().region("maincpu", 0); // required for NMI handler and for initial boot
|
||||
map(0x0000, 0xefff).ram();
|
||||
map(0xf000, 0xfbff).rom().region("maincpu", 0);
|
||||
map(0xfc00, 0xffff).ram();
|
||||
}
|
||||
@ -81,10 +156,14 @@ void icebox_state::io_map(address_map &map)
|
||||
{
|
||||
map.global_mask(0xff);
|
||||
map.unmap_value_high();
|
||||
map(0xe0, 0xe0).rw("uart0", FUNC(i8251_device::data_r), FUNC(i8251_device::data_w));
|
||||
map(0xe1, 0xe1).rw("uart0", FUNC(i8251_device::status_r), FUNC(i8251_device::control_w));
|
||||
map(0xe2, 0xe2).rw("uart1", FUNC(i8251_device::data_r), FUNC(i8251_device::data_w));
|
||||
map(0xe3, 0xe3).rw("uart1", FUNC(i8251_device::status_r), FUNC(i8251_device::control_w));
|
||||
map(0xe0, 0xe0).rw(m_uart0, FUNC(i8251_device::data_r), FUNC(i8251_device::data_w));
|
||||
map(0xe1, 0xe1).rw(m_uart0, FUNC(i8251_device::status_r), FUNC(i8251_device::control_w));
|
||||
map(0xe2, 0xe2).rw(m_uart1, FUNC(i8251_device::data_r), FUNC(i8251_device::data_w));
|
||||
map(0xe3, 0xe3).rw(m_uart1, FUNC(i8251_device::status_r), FUNC(i8251_device::control_w));
|
||||
map(0xe4, 0xe7).lrw8("fdc_usage",
|
||||
[this](offs_t offset) { return m_fdc->read(offset^3); },
|
||||
[this](offs_t offset, u8 data) { m_fdc->write(offset^3, data); });
|
||||
map(0xf1, 0xf1).lw8("port_F1", [this](u8 data) { port_f1_w(data); } );
|
||||
}
|
||||
|
||||
/* Input ports */
|
||||
@ -129,13 +208,57 @@ void icebox_state::machine_reset()
|
||||
u8 data = ioport("BAUD")->read();
|
||||
m_brg->write_str(data & 15); // Terminal
|
||||
m_brg->write_stt((data >> 4) & 15); // Printer
|
||||
//m_maincpu->set_pc(0xf000);
|
||||
m_maincpu->set_pc(0xf000);
|
||||
m_f1 = 0;
|
||||
}
|
||||
|
||||
//static void xor100_floppies(device_slot_interface &device)
|
||||
//{
|
||||
// device.option_add("flop", FLOPPY_8_SSDD); // Pertec "iCOM FD5200"
|
||||
//}
|
||||
void icebox_state::port_f1_w(u8 data)
|
||||
{
|
||||
m_f1 = data;
|
||||
|
||||
floppy_image_device *floppy = nullptr;
|
||||
|
||||
switch (data & 7)
|
||||
{
|
||||
case 4:
|
||||
floppy = m_floppy0->get_device();
|
||||
break;
|
||||
case 5:
|
||||
floppy = m_floppy1->get_device();
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
m_fdc->set_floppy(floppy);
|
||||
|
||||
if (floppy)
|
||||
{
|
||||
floppy->mon_w(0);
|
||||
floppy->ss_w(0); // side 0 ?
|
||||
}
|
||||
|
||||
m_fdc->dden_w(1); // single density?
|
||||
}
|
||||
|
||||
// Command complete: release CPU from halt, via IM0.
|
||||
WRITE_LINE_MEMBER(icebox_state::intrq_w)
|
||||
{
|
||||
if (BIT(m_f1, 2) && state)
|
||||
m_maincpu->set_input_line_and_vector(INPUT_LINE_IRQ0, HOLD_LINE, 0xc9);
|
||||
}
|
||||
|
||||
// The next byte from floppy is available. Enable CPU so it can get the byte, via IM0.
|
||||
WRITE_LINE_MEMBER(icebox_state::drq_w)
|
||||
{
|
||||
if (BIT(m_f1, 2) && state)
|
||||
m_maincpu->set_input_line_and_vector(INPUT_LINE_IRQ0, HOLD_LINE, 0xc9);
|
||||
}
|
||||
|
||||
static void floppies(device_slot_interface &device)
|
||||
{
|
||||
device.option_add("flop", FLOPPY_8_SSDD); // Pertec "iCOM FD5200"
|
||||
}
|
||||
|
||||
static DEVICE_INPUT_DEFAULTS_START( terminal ) // we need to remove bit 7 which is on the last character of each message
|
||||
DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_9600 )
|
||||
@ -148,7 +271,7 @@ DEVICE_INPUT_DEFAULTS_END
|
||||
|
||||
MACHINE_CONFIG_START(icebox_state::icebox)
|
||||
/* basic machine hardware */
|
||||
MCFG_DEVICE_ADD("maincpu",Z80, 2'000'000) // unknown crystal and clock
|
||||
MCFG_DEVICE_ADD("maincpu",Z80, 9'830'400 / 4) // unknown divisor
|
||||
MCFG_DEVICE_PROGRAM_MAP(mem_map)
|
||||
MCFG_DEVICE_IO_MAP(io_map)
|
||||
|
||||
@ -179,11 +302,13 @@ MACHINE_CONFIG_START(icebox_state::icebox)
|
||||
m_brg->ft_handler().set(m_uart1, FUNC(i8251_device::write_txc));
|
||||
m_brg->ft_handler().append(m_uart1, FUNC(i8251_device::write_rxc));
|
||||
|
||||
// MCFG_DEVICE_ADD("fdc", FD1771, 4_MHz_XTAL / 2)
|
||||
// MCFG_FLOPPY_DRIVE_ADD("fdc:0", floppies, "flop", floppy_image_device::default_floppy_formats)
|
||||
// MCFG_FLOPPY_DRIVE_SOUND(true)
|
||||
// MCFG_FLOPPY_DRIVE_ADD("fdc:1", floppies, "flop", floppy_image_device::default_floppy_formats)
|
||||
// MCFG_FLOPPY_DRIVE_SOUND(true)
|
||||
MCFG_DEVICE_ADD(m_fdc, FD1771, 4_MHz_XTAL / 2)
|
||||
MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(*this, icebox_state, intrq_w))
|
||||
MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(*this, icebox_state, drq_w))
|
||||
MCFG_FLOPPY_DRIVE_ADD(m_floppy0, floppies, "flop", floppy_image_device::default_floppy_formats)
|
||||
MCFG_FLOPPY_DRIVE_SOUND(true)
|
||||
MCFG_FLOPPY_DRIVE_ADD(m_floppy1, floppies, "flop", floppy_image_device::default_floppy_formats)
|
||||
MCFG_FLOPPY_DRIVE_SOUND(true)
|
||||
MACHINE_CONFIG_END
|
||||
|
||||
/* ROM definition */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user