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PIT: add alternative faster PIT

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This is enabled by default on 486+ CPUs and can be forced disabled/enabled with pit_mode=0/1
This commit is contained in:
Adrien Moulin
2022-07-23 13:38:10 +02:00
parent 23e082aeea
commit 2aa5d8f5b2
26 changed files with 968 additions and 108 deletions
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6
src/machine/m_xt_olivetti.c
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@@ -241,7 +241,7 @@ m24_kbd_write(uint16_t port, uint8_t val, void *priv)
speaker_enable = val & 2;
if (speaker_enable)
was_speaker_enable = 1;
pit_ctr_set_gate(&pit->counters[2], val & 1);
pit_devs[0].set_gate(pit_devs[0].data, 2, val & 1);
break;
}
}
@@ -792,7 +792,7 @@ machine_xt_m240_init(const machine_t *model)
machine_common_init(model);
pit_ctr_set_out_func(&pit->counters[1], pit_refresh_timer_xt);
pit_devs[0].set_out_func(pit_devs[0].data, 1, pit_refresh_timer_xt);
/* Address 66-67 = mainboard dip-switch settings */
io_sethandler(0x0066, 2, m24_read, NULL, NULL, NULL, NULL, NULL, NULL);
@@ -846,7 +846,7 @@ machine_xt_m19_init(const machine_t *model)
machine_common_init(model);
pit_ctr_set_out_func(&pit->counters[1], pit_refresh_timer_xt);
pit_devs[0].set_out_func(pit_devs[0].data, 1, pit_refresh_timer_xt);
/* On-board FDC cannot be disabled */
device_add(&fdc_xt_device);