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Added Toshiba T1200 emulation. Patch from John Elliott.

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This commit is contained in:
SarahW 2018-01-31 21:53:23 +00:00
commit 8f04b6b9a4
9 changed files with 102 additions and 5 deletions
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77
src/t1000.c
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@ -27,7 +27,8 @@
* A ROM drive (128k, 256k or 512k) which acts as a mini hard
* drive and contains a copy of DOS 2.11.
* 160 bytes of non-volatile RAM for the CONFIG.SYS used when
* booting from the ROM drive.
* booting from the ROM drive. Possibly physically located
* in the keyboard controller RAM.
*
* An optional memory expansion board can be fitted. This adds 768k of RAM,
* which can be used for up to three purposes:
@ -38,7 +39,13 @@
* This means that there are up to three different implementations of
* non-volatile RAM in the same computer (52 nibbles in the TC8521, 160
* bytes of CONFIG.SYS, and up to 768k of HardRAM).
*
*
* The T1200 is a slightly upgraded version with a turbo mode (double CPU
* clock, 9.54MHz) and an optional hard drive. The interface for this is
* proprietary both at the physical and programming level.
*
* 01F2h: If hard drive is present, low 4 bits are 0Ch [20Mb] or 0Dh [10Mb].
*
*/
void common_init();
@ -56,6 +63,7 @@ static struct t1000_system
/* System control registers */
uint8_t sys_ctl[16];
uint8_t syskeys;
uint8_t turbo;
/* NVRAM control */
uint8_t nvr_c0;
@ -375,6 +383,26 @@ static uint8_t read_t1000_ctl(uint16_t addr, void *priv)
}
}
static void t1200_turbo_set(uint8_t value)
{
if (value == t1000.turbo)
{
return;
}
t1000.turbo = value;
if (!value)
{
int c = cpu;
cpu = 0; /* 8088/4.77MHz */
cpu_set();
cpu = c;
}
else
{
cpu_set();
}
}
static void write_t1000_ctl(uint16_t addr, uint8_t val, void *priv)
{
struct t1000_system *sys = (struct t1000_system *)priv;
@ -387,6 +415,10 @@ static void write_t1000_ctl(uint16_t addr, uint8_t val, void *priv)
{
t1000_video_options_set((val & 0x20) ? 1 : 0);
t1000_display_set((val & 0x40) ? 0 : 1);
if (romset == ROM_T1200)
{
t1200_turbo_set((val & 0x80) ? 1 : 0);
}
}
break;
/* EMS control*/
@ -526,6 +558,7 @@ void xt_t1000_init()
int pg;
memset(&t1000, 0, sizeof(t1000));
t1000.turbo = 0xff;
t1000.ems_port_index = 7; /* EMS disabled */
/* The ROM drive is optional. If the file is missing, continue to boot; the
* BIOS will complain 'No ROM drive' but boot normally from floppy. */
@ -577,3 +610,43 @@ void xt_t1000_init()
nvr_tc8521_init();
/* No gameport, and no provision to fit one device_add(&gameport_device); */
}
void xt_t1200_init()
{
int pg;
memset(&t1000, 0, sizeof(t1000));
t1000.ems_port_index = 7; /* EMS disabled */
mem_mapping_add(&t1000.rom_mapping, 0xA0000, 0x10000,
t1000_read_rom, t1000_read_romw, t1000_read_roml,
NULL, NULL, NULL, NULL, MEM_MAPPING_INTERNAL, &t1000);
mem_mapping_disable(&t1000.rom_mapping);
/* Map the EMS page frame */
for (pg = 0; pg < 4; pg++)
{
mem_mapping_add(&t1000.mapping[pg],
0xD0000 + (0x4000 * pg), 16384,
ems_read_ram, ems_read_ramw, ems_read_raml,
ems_write_ram, ems_write_ramw, ems_write_raml,
NULL, MEM_MAPPING_EXTERNAL,
&t1000);
/* Start them all off disabled */
mem_mapping_disable(&t1000.mapping[pg]);
}
/* System control functions, and add-on memory board */
io_sethandler(0xE0, 0x10, read_t1000_ctl, NULL, NULL,
write_t1000_ctl, NULL, NULL, &t1000);
common_init();
mem_add_bios();
pit_set_out_func(&pit, 1, pit_refresh_timer_xt);
keyboard_xt_init();
nmi_init();
nvr_tc8521_init();
/* No gameport, and no provision to fit one device_add(&gameport_device); */
}