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-rw-r--r--src/devices/machine/tmc0999.h57
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diff --git a/src/devices/machine/tmc0999.h b/src/devices/machine/tmc0999.h
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+// license:BSD-3-Clause
+// copyright-holders:hap
+/*
+
+ Texas Instruments TMC0999 256x4 RAM
+
+*/
+
+#ifndef MAME_MACHINE_TMC0999_H
+#define MAME_MACHINE_TMC0999_H
+
+#pragma once
+
+/*
+
+quick pinout reference (18-pin DIP)
+
+17,18,1,2: data outputs (do_r)
+3-6: data inputs (di_w)
+7: address latch strobe (adr_w)
+13: data input strobe (wr_w)
+14: data output enable (rd_w)
+
+*/
+
+
+class tmc0999_device : public device_t
+{
+public:
+ tmc0999_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
+
+ void di_w(u8 data);
+ u8 do_r();
+ void wr_w(int state);
+ void rd_w(int state);
+ void adr_w(int state);
+
+protected:
+ // device-level overrides
+ virtual void device_start() override ATTR_COLD;
+
+private:
+ // input pins state
+ u8 m_data;
+ int m_wr;
+ int m_rd;
+ int m_adr_strobe;
+
+ // internal state
+ u8 m_ram_address;
+ u8 m_ram[0x100];
+};
+
+
+DECLARE_DEVICE_TYPE(TMC0999, tmc0999_device)
+
+#endif // MAME_MACHINE_TMC0999_H