mirror of
https://github.com/holub/mame
synced 2025-04-22 16:31:49 +03:00
uts20: implement parity poison feature, remove ROM patches (tests all pass)
This commit is contained in:
Vas Crabb
parent
166fb6531a
commit
a2b1739996
@ -1,5 +1,5 @@
|
||||
// license:BSD-3-Clause
|
||||
// copyright-holders:Robbbert
|
||||
// copyright-holders:Robbbert,Vas Crabb
|
||||
/***************************************************************************
|
||||
|
||||
Univac Terminals
|
||||
@ -20,16 +20,6 @@ This driver is all guesswork; Unisys never released technical info
|
||||
to customers. All parts on the PCBs have internal Unisys part numbers
|
||||
instead of the manufacturer's numbers.
|
||||
|
||||
Notes on failures in power-on test:
|
||||
* Test 2 checks RAM parity. Patched out
|
||||
* Test 5 tests ROM checksum. It seems one or more roms is a bad dump.
|
||||
* Test 7 tests SIO ch B. The SIO should cause 9 interrupts. The CTC is
|
||||
programmed as a time-out. But SIO only does first interrupt then hangs.
|
||||
CTC then fires causing the failure message. It's unknown which CTC
|
||||
channel drives Ch B, none seem to work. CTC trigger frequencies are
|
||||
all guesswork too, but the present setup allows Tests 3 and 6 to pass.
|
||||
|
||||
|
||||
****************************************************************************/
|
||||
|
||||
#include "emu.h"
|
||||
@ -43,6 +33,14 @@ Notes on failures in power-on test:
|
||||
#include "sound/beep.h"
|
||||
#include "speaker.h"
|
||||
|
||||
#define LOG_GENERAL (1U << 0)
|
||||
#define LOG_PARITY (1U << 1)
|
||||
|
||||
//#define VERBOSE (LOG_GENERAL | LOG_PARITY)
|
||||
#include "logmacro.h"
|
||||
|
||||
#define LOGPARITY(...) LOGMASKED(LOG_PARITY, __VA_ARGS__)
|
||||
|
||||
|
||||
class univac_state : public driver_device
|
||||
{
|
||||
@ -50,62 +48,125 @@ public:
|
||||
univac_state(const machine_config &mconfig, device_type type, const char *tag)
|
||||
: driver_device(mconfig, type, tag)
|
||||
, m_maincpu(*this, "maincpu")
|
||||
, m_p_videoram(*this, "videoram")
|
||||
, m_nvram(*this, "nvram")
|
||||
, m_ctc(*this, "ctc")
|
||||
, m_uart(*this, "uart")
|
||||
, m_p_chargen(*this, "chargen")
|
||||
, m_beep(*this, "beeper")
|
||||
, m_p_chargen(*this, "chargen")
|
||||
, m_p_videoram(*this, "videoram")
|
||||
, m_bank_mask(0)
|
||||
, m_parity_check(0)
|
||||
, m_parity_poison(0)
|
||||
, m_framecnt(0)
|
||||
{ }
|
||||
|
||||
DECLARE_READ8_MEMBER(vram_r);
|
||||
DECLARE_WRITE8_MEMBER(vram_w);
|
||||
DECLARE_WRITE8_MEMBER(port43_w);
|
||||
DECLARE_WRITE8_MEMBER(porte6_w);
|
||||
uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
|
||||
DECLARE_READ8_MEMBER(ram_r);
|
||||
DECLARE_READ8_MEMBER(bank_r);
|
||||
DECLARE_WRITE8_MEMBER(ram_w);
|
||||
DECLARE_WRITE8_MEMBER(bank_w);
|
||||
|
||||
private:
|
||||
bool m_screen_num;
|
||||
uint8_t m_framecnt;
|
||||
DECLARE_WRITE8_MEMBER(port43_w);
|
||||
DECLARE_WRITE8_MEMBER(portc4_w);
|
||||
DECLARE_WRITE8_MEMBER(porte6_w);
|
||||
|
||||
u32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
|
||||
|
||||
protected:
|
||||
virtual void machine_start() override;
|
||||
virtual void machine_reset() override;
|
||||
required_device<cpu_device> m_maincpu;
|
||||
required_shared_ptr<uint8_t> m_p_videoram;
|
||||
required_device<nvram_device> m_nvram;
|
||||
required_device<z80ctc_device> m_ctc;
|
||||
required_device<z80sio_device> m_uart;
|
||||
virtual void device_post_load() override;
|
||||
|
||||
private:
|
||||
required_device<cpu_device> m_maincpu;
|
||||
required_device<nvram_device> m_nvram;
|
||||
required_device<z80ctc_device> m_ctc;
|
||||
required_device<z80sio_device> m_uart;
|
||||
required_device<beep_device> m_beep;
|
||||
|
||||
required_region_ptr<u8> m_p_chargen;
|
||||
required_device<beep_device> m_beep;
|
||||
required_shared_ptr<u8> m_p_videoram;
|
||||
std::unique_ptr<u8 []> m_p_parity;
|
||||
|
||||
u16 m_bank_mask;
|
||||
u8 m_parity_check;
|
||||
u8 m_parity_poison;
|
||||
u8 m_framecnt;
|
||||
};
|
||||
|
||||
|
||||
|
||||
READ8_MEMBER( univac_state::ram_r )
|
||||
{
|
||||
if (BIT(m_p_parity[offset >> 3], offset & 0x07) && !machine().side_effect_disabled())
|
||||
{
|
||||
LOGPARITY("parity check failed offset = %04X\n", offset);
|
||||
m_maincpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE);
|
||||
}
|
||||
return m_p_videoram[offset];
|
||||
}
|
||||
|
||||
READ8_MEMBER( univac_state::bank_r )
|
||||
{
|
||||
return space.read_byte((0xc000 | offset) ^ m_bank_mask);
|
||||
}
|
||||
|
||||
WRITE8_MEMBER( univac_state::ram_w )
|
||||
{
|
||||
if (m_parity_poison)
|
||||
{
|
||||
LOGPARITY("poison parity offset = %04X\n", offset);
|
||||
m_p_parity[offset >> 3] |= u8(1) << (offset & 0x07);
|
||||
}
|
||||
else
|
||||
{
|
||||
m_p_parity[offset >> 3] &= ~(u8(1) << (offset & 0x07));
|
||||
}
|
||||
m_p_videoram[offset] = data;
|
||||
}
|
||||
|
||||
WRITE8_MEMBER( univac_state::bank_w )
|
||||
{
|
||||
space.write_byte((0xc000 | offset) ^ m_bank_mask, data);
|
||||
}
|
||||
|
||||
WRITE8_MEMBER( univac_state::port43_w )
|
||||
{
|
||||
m_bank_mask = BIT(data, 0) ? 0x2000 : 0x0000;
|
||||
}
|
||||
|
||||
WRITE8_MEMBER( univac_state::portc4_w )
|
||||
{
|
||||
m_parity_poison = BIT(data, 0);
|
||||
u8 const check = BIT(data, 1);
|
||||
if (check != m_parity_check)
|
||||
{
|
||||
m_parity_check = check;
|
||||
address_space &space(m_maincpu->space(AS_PROGRAM));
|
||||
space.unmap_read(0xc000, 0xffff);
|
||||
if (check)
|
||||
{
|
||||
LOGPARITY("parity check enabled\n");
|
||||
space.install_read_handler(0xc000, 0xffff, read8_delegate(FUNC(univac_state::ram_r), this));
|
||||
}
|
||||
else
|
||||
{
|
||||
LOGPARITY("parity check disabled\n");
|
||||
space.install_rom(0xc000, 0xffff, &m_p_videoram[0]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
WRITE8_MEMBER( univac_state::porte6_w )
|
||||
{
|
||||
m_beep->set_state(BIT(data, 0));
|
||||
}
|
||||
|
||||
WRITE8_MEMBER( univac_state::port43_w )
|
||||
{
|
||||
m_screen_num = BIT(data, 0);
|
||||
}
|
||||
|
||||
READ8_MEMBER( univac_state::vram_r )
|
||||
{
|
||||
return m_p_videoram[offset ^ (m_screen_num ? 0x2000 : 0)];
|
||||
}
|
||||
|
||||
WRITE8_MEMBER( univac_state::vram_w )
|
||||
{
|
||||
m_p_videoram[offset ^ (m_screen_num ? 0x2000 : 0)] = data;
|
||||
}
|
||||
|
||||
|
||||
static ADDRESS_MAP_START( mem_map, AS_PROGRAM, 8, univac_state )
|
||||
ADDRESS_MAP_UNMAP_HIGH
|
||||
AM_RANGE( 0x0000, 0x4fff ) AM_ROM AM_REGION("roms", 0)
|
||||
AM_RANGE( 0x8000, 0xbfff ) AM_READWRITE(vram_r,vram_w)
|
||||
AM_RANGE( 0xc000, 0xffff ) AM_RAM AM_SHARE("videoram")
|
||||
AM_RANGE( 0x8000, 0xbfff ) AM_READWRITE(bank_r, bank_w)
|
||||
AM_RANGE( 0xc000, 0xffff ) AM_RAM_WRITE(ram_w) AM_SHARE("videoram")
|
||||
ADDRESS_MAP_END
|
||||
|
||||
static ADDRESS_MAP_START( io_map, AS_IO, 8, univac_state )
|
||||
@ -115,6 +176,7 @@ static ADDRESS_MAP_START( io_map, AS_IO, 8, univac_state )
|
||||
AM_RANGE(0x20, 0x23) AM_DEVREADWRITE("ctc", z80ctc_device, read, write)
|
||||
AM_RANGE(0x43, 0x43) AM_WRITE(port43_w)
|
||||
AM_RANGE(0x80, 0xbf) AM_RAM AM_SHARE("nvram")
|
||||
AM_RANGE(0xc4, 0xc4) AM_WRITE(portc4_w)
|
||||
AM_RANGE(0xe6, 0xe6) AM_WRITE(porte6_w)
|
||||
ADDRESS_MAP_END
|
||||
|
||||
@ -125,20 +187,43 @@ INPUT_PORTS_END
|
||||
|
||||
void univac_state::machine_start()
|
||||
{
|
||||
// D7DC and D7DD are checked for valid RID and SID (usually 21 and 51) if not valid then NVRAM gets initialised.
|
||||
// D7DC and D7DD are checked for valid RID and SID (usually 21 and 51) if not valid then NVRAM gets initialised.
|
||||
|
||||
std::size_t const parity_bytes = (m_p_videoram.bytes() + 7) / 8;
|
||||
m_p_parity.reset(new u8[parity_bytes]);
|
||||
std::fill_n(m_p_parity.get(), parity_bytes, 0);
|
||||
|
||||
save_pointer(NAME(m_p_parity.get()), parity_bytes);
|
||||
save_item(NAME(m_bank_mask));
|
||||
save_item(NAME(m_parity_check));
|
||||
save_item(NAME(m_parity_poison));
|
||||
save_item(NAME(m_framecnt));
|
||||
}
|
||||
|
||||
void univac_state::machine_reset()
|
||||
{
|
||||
m_screen_num = 0;
|
||||
m_beep->set_state(0);
|
||||
|
||||
m_bank_mask = 0x0000;
|
||||
m_parity_check = 0;
|
||||
m_parity_poison = 0;
|
||||
}
|
||||
|
||||
void univac_state::device_post_load()
|
||||
{
|
||||
if (m_parity_check)
|
||||
{
|
||||
address_space &space(m_maincpu->space(AS_PROGRAM));
|
||||
space.unmap_read(0xc000, 0xffff);
|
||||
space.install_read_handler(0xc000, 0xffff, read8_delegate(FUNC(univac_state::ram_r), this));
|
||||
}
|
||||
}
|
||||
|
||||
uint32_t univac_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
|
||||
{
|
||||
uint8_t y,ra,chr,gfx;
|
||||
uint16_t sy=0,ma=0,x;
|
||||
uint8_t *videoram = m_p_videoram;//+(m_screen_num ? 0x2000 : 0);
|
||||
uint8_t *videoram = m_p_videoram;//^ m_bank_mask;
|
||||
|
||||
m_framecnt++;
|
||||
|
||||
@ -238,9 +323,6 @@ ROM_START( uts20 )
|
||||
ROM_LOAD( "uts20c.rom", 0x2000, 0x1000, CRC(4e334705) SHA1(ff1a730551b42f29d20af8ecc4495fd30567d35b) )
|
||||
ROM_LOAD( "uts20d.rom", 0x3000, 0x1000, CRC(76757cf7) SHA1(b0509d9a35366b21955f83ec3685163844c4dbf1) )
|
||||
ROM_LOAD( "uts20e.rom", 0x4000, 0x1000, CRC(0dfc8062) SHA1(cd681020bfb4829d4cebaf1b5bf618e67b55bda3) )
|
||||
// Patches, see notes at top.
|
||||
ROM_FILL(0x2bd,1,0xaf) // test 2
|
||||
ROM_FILL(0x48f1,1,0xa6) // test 5, patch unused byte to fix checksum
|
||||
|
||||
/* character generator not dumped, using the one from 'c10' for now */
|
||||
ROM_REGION( 0x2000, "chargen", 0 )
|
||||
@ -250,4 +332,4 @@ ROM_END
|
||||
/* Driver */
|
||||
|
||||
// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
|
||||
COMP( 1980, uts20, 0, 0, uts20, uts20, univac_state, 0, "Sperry Univac", "UTS-20", MACHINE_NOT_WORKING )
|
||||
COMP( 1980, uts20, 0, 0, uts20, uts20, univac_state, 0, "Sperry Univac", "UTS-20", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE )
|
||||
|
||||
Loading…
Reference in New Issue
Block a user