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diff --git a/src/devices/bus/isa/aha1542b.h b/src/devices/bus/isa/aha1542b.h
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+// license:BSD-3-Clause
+// copyright-holders:AJR
+/***************************************************************************
+
+ Adaptec AHA-1540/42A and AHA-1540/42B SCSI controllers
+
+***************************************************************************/
+
+#ifndef MAME_BUS_ISA_AHA1542B_H
+#define MAME_BUS_ISA_AHA1542B_H
+
+#pragma once
+
+#include "isa.h"
+#include "machine/upd765.h"
+
+class aha154x_device : public device_t, public device_isa16_card_interface
+{
+protected:
+ aha154x_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock);
+
+ virtual void device_start() override;
+ virtual void device_add_mconfig(machine_config &config) override;
+
+ void i8085_map(address_map &map);
+ void scsic_config(device_t *device);
+
+ required_device<upd765_family_device> m_fdc;
+ required_region_ptr<u8> m_bios;
+};
+
+class aha1542a_device : public aha154x_device
+{
+public:
+ aha1542a_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ static constexpr feature_type unemulated_features() { return feature::DISK; }
+
+protected:
+ virtual const tiny_rom_entry *device_rom_region() const override;
+};
+
+class aha1542b_device : public aha154x_device
+{
+public:
+ aha1542b_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ static constexpr feature_type unemulated_features() { return feature::DISK; }
+
+protected:
+ virtual const tiny_rom_entry *device_rom_region() const override;
+};
+
+DECLARE_DEVICE_TYPE(AHA1542A, aha1542a_device)
+DECLARE_DEVICE_TYPE(AHA1542B, aha1542b_device)
+
+#endif // MAME_BUS_ISA_AHA1542B_H