diff --git a/drivers/net/hydra.h b/drivers/net/hydra.h
new file mode 100644
index 0000000..3741414
--- /dev/null
+++ b/drivers/net/hydra.h
@@ -0,0 +1,177 @@
+/*	$Linux: hydra.h,v 1.0 1994/10/26 02:03:47 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1994 Timo Rossi
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by  Timo Rossi
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * The Hydra Systems card uses the National Semiconductor
+ * 8390 NIC (Network Interface Controller) chip, located
+ * at card base address + 0xffe1. NIC registers are accessible
+ * only at odd byte addresses, so the register offsets must
+ * be multiplied by two.
+ *
+ * Card address PROM is located at card base + 0xffc0 (even byte addresses)
+ *
+ * RAM starts at the card base address, and is 16K or 64K.
+ * The current Amiga NetBSD hydra driver is hardwired for 16K.
+ * It seems that the RAM should be accessed as words or longwords only.
+ *
+ */
+
+/* adapted for Linux by Topi Kanerva 03/29/95
+   with original author's permission          */
+
+#define HYDRA_NIC_BASE 0xffe1
+
+/* Page0 registers */
+
+#define NIC_CR     0       /* Command register   */
+#define NIC_PSTART (1*2)   /* Page start (write) */
+#define NIC_PSTOP  (2*2)   /* Page stop (write)  */
+#define NIC_BNDRY  (3*2)   /* Boundary pointer   */
+#define NIC_TSR    (4*2)   /* Transmit status (read) */
+#define NIC_TPSR   (4*2)   /* Transmit page start (write) */
+#define NIC_NCR    (5*2)   /* Number of collisions, read  */
+#define NIC_TBCR0  (5*2)   /* Transmit byte count low (write)  */
+#define NIC_FIFO   (6*2)   /* FIFO reg. (read)   */
+#define NIC_TBCR1  (6*2)   /* Transmit byte count high (write) */
+#define NIC_ISR    (7*2)   /* Interrupt status register */
+#define NIC_RBCR0  (0xa*2) /* Remote byte count low (write)  */
+#define NIC_RBCR1  (0xb*2) /* Remote byte count high (write) */
+#define NIC_RSR    (0xc*2) /* Receive status (read)  */
+#define NIC_RCR    (0xc*2) /* Receive config (write) */
+#define NIC_CNTR0  (0xd*2) /* Frame alignment error count (read) */
+#define NIC_TCR    (0xd*2) /* Transmit config (write)  */
+#define NIC_CNTR1  (0xe*2) /* CRC error counter (read) */
+#define NIC_DCR    (0xe*2) /* Data config (write) */
+#define NIC_CNTR2  (0xf*2) /* missed packet counter (read) */
+#define NIC_IMR    (0xf*2) /* Interrupt mask reg. (write)  */
+
+/* Page1 registers */
+
+#define NIC_PAR0   (1*2)   /* Physical address */
+#define NIC_PAR1   (2*2)
+#define NIC_PAR2   (3*2)
+#define NIC_PAR3   (4*2)
+#define NIC_PAR4   (5*2)
+#define NIC_PAR5   (6*2)
+#define NIC_CURR   (7*2)   /* Current RX ring-buffer page */
+#define NIC_MAR0   (8*2)   /* Multicast address */
+#define NIC_MAR1   (9*2)
+#define NIC_MAR2   (0xa*2)
+#define NIC_MAR3   (0xb*2)
+#define NIC_MAR4   (0xc*2)
+#define NIC_MAR5   (0xd*2)
+#define NIC_MAR6   (0xe*2)
+#define NIC_MAR7   (0xf*2)
+
+/* Command register definitions */
+
+#define CR_STOP   0x01 /* Stop -- software reset command */
+#define CR_START  0x02 /* Start */
+#define CR_TXP   0x04 /* Transmit packet */
+
+#define CR_RD0    0x08 /* Remote DMA cmd */
+#define CR_RD1    0x10
+#define CR_RD2    0x20
+
+#define CR_NODMA  CR_RD2
+
+#define CR_PS0    0x40 /* Page select */
+#define CR_PS1    0x80
+
+#define CR_PAGE0  0
+#define CR_PAGE1  CR_PS0
+#define CR_PAGE2  CR_PS1
+
+/* Interrupt status reg. definitions */
+
+#define ISR_PRX   0x01 /* Packet received without errors */
+#define ISR_PTX   0x02 /* Packet transmitted without errors */
+#define ISR_RXE   0x04 /* Receive error  */
+#define ISR_TXE   0x08 /* Transmit error */
+#define ISR_OVW   0x10 /* Ring buffer overrun */
+#define ISR_CNT   0x20 /* Counter overflow    */
+#define ISR_RDC   0x40 /* Remote DMA compile */
+#define ISR_RST   0x80 /* Reset status      */
+
+/* Data config reg. definitions */
+
+#define DCR_WTS   0x01 /* Word transfer select  */
+#define DCR_BOS   0x02 /* Byte order select     */
+#define DCR_LAS   0x04 /* Long address select   */
+#define DCR_LS    0x08 /* Loopback select       */
+#define DCR_AR    0x10 /* Auto-init remote      */
+#define DCR_FT0   0x20 /* FIFO threshold select */
+#define DCR_FT1   0x40
+
+/* Transmit config reg. definitions */
+
+#define TCR_CRC  0x01 /* Inhibit CRC */
+#define TCR_LB0  0x02 /* Loopback control */
+#define TCR_LB1  0x04
+#define TCR_ATD  0x08 /* Auto transmit disable */
+#define TCR_OFST 0x10 /* Collision offset enable */
+
+/* Transmit status reg. definitions */
+
+#define TSR_PTX  0x01 /* Packet transmitted */
+#define TSR_COL  0x04 /* Transmit collided */
+#define TSR_ABT  0x08 /* Transmit aborted */
+#define TSR_CRS  0x10 /* Carrier sense lost */
+#define TSR_FU   0x20 /* FIFO underrun */
+#define TSR_CDH  0x40 /* CD Heartbeat */
+#define TSR_OWC  0x80 /* Out of Window Collision */
+
+/* Receiver config register definitions */
+
+#define RCR_SEP  0x01 /* Save errored packets */
+#define RCR_AR   0x02 /* Accept runt packets */
+#define RCR_AB   0x04 /* Accept broadcast */
+#define RCR_AM   0x08 /* Accept multicast */
+#define RCR_PRO  0x10 /* Promiscuous mode */
+#define RCR_MON  0x20 /* Monitor mode */
+
+/* Receiver status register definitions */
+
+#define RSR_PRX  0x01 /* Packet received without error */
+#define RSR_CRC  0x02 /* CRC error */
+#define RSR_FAE  0x04 /* Frame alignment error */
+#define RSR_FO   0x08 /* FIFO overrun */
+#define RSR_MPA  0x10 /* Missed packet */
+#define RSR_PHY  0x20 /* Physical address */
+#define RSR_DIS  0x40 /* Received disabled */
+#define RSR_DFR  0x80 /* Deferring (jabber) */
+
+/* Hydra System card address PROM offset */
+
+#define HYDRA_ADDRPROM 0xffc0
+
+