Added Toshiba T1000 emulation. Patch from John Elliott.

src/nvr_tc8521.c

@@ -0,0 +1,98 @@
+#include <stdio.h>
+#include "ibm.h"
+#include "io.h"
+#include "nvr.h"
+#include "nvr_tc8521.h"
+#include "rtc_tc8521.h"
+#include "pic.h"
+#include "timer.h"
+#include "rtc.h"
+#include "paths.h"
+#include "config.h"
+#include "nmi.h"
+
+static int nvr_onesec_time = 0, nvr_onesec_cnt = 0;
+
+static void tc8521_onesec(void *p)
+{
+        nvr_onesec_cnt++;
+        if (nvr_onesec_cnt >= 100)
+        {
+		tc8521_tick();
+                nvr_onesec_cnt = 0;
+        }
+        nvr_onesec_time += (int)(10000 * TIMER_USEC);
+}
+
+void write_tc8521(uint16_t addr, uint8_t val, void *priv)
+{
+	uint8_t page = nvrram[0x0D] & 3;
+
+	addr &= 0x0F;
+	if (addr < 0x0D) addr += 16 * page;
+
+        if (addr >= 0x10 && nvrram[addr] != val)
+        	nvr_dosave = 1;
+               
+	nvrram[addr] = val;
+}
+
+
+uint8_t read_tc8521(uint16_t addr, void *priv)
+{
+	uint8_t page = nvrram[0x0D] & 3;
+
+	addr &= 0x0F;
+	if (addr < 0x0D) addr += 16 * page;
+
+	return nvrram[addr];
+}
+
+
+void tc8521_loadnvr()
+{
+        FILE *f;
+
+        nvrmask=63;
+        oldromset=romset;
+        switch (romset)
+        {
+                case ROM_T1000: f = nvrfopen("t1000.nvr", "rb"); break;
+                default: return;
+        }
+        if (!f)
+        {
+                memset(nvrram,0xFF,64);
+		nvrram[0x0E] = 0;	/* Test register */
+                if (!enable_sync)
+                {
+			memset(nvrram, 0, 16);
+                }
+                return;
+        }
+        fread(nvrram,64,1,f);
+        if (enable_sync)
+                tc8521_internal_sync(nvrram);
+        else
+                tc8521_internal_set_nvrram(nvrram); /* Update the internal clock state based on the NVR registers. */
+        fclose(f);
+}
+
+
+void tc8521_savenvr()
+{
+        FILE *f;
+        switch (oldromset)
+        {
+                case ROM_T1000: f = nvrfopen("t1000.nvr", "wb"); break;
+                default: return;
+        }
+        fwrite(nvrram,64,1,f);
+        fclose(f);
+}
+
+void nvr_tc8521_init()
+{
+        io_sethandler(0x2C0, 0x10, read_tc8521, NULL, NULL, write_tc8521, NULL, NULL,  NULL);
+        timer_add(tc8521_onesec, &nvr_onesec_time, TIMER_ALWAYS_ENABLED, NULL);
+}