I have today tried out the latest development kernel on an Intel SC450NX - this is a 7+ year old machine running a 4 way Intel Xeon Pentium III 55 Mhz CPU environment. The machine has 3 in-built SCSI bus controllers - all Symbios. Chip sym53c896, device id 0xb, revision id 0x1 At PCI address 0000:01:03.0, IRQ 17 Min. period factor 10, Wide SCSI BUS Max. started commands 448, max. commands per LUN 64 Chip sym53c896, device id 0xb, revision id 0x1 At PCI address 0000:01:03.1, IRQ 18 Min. period factor 10, Wide SCSI BUS Max. started commands 448, max. commands per LUN 64 Chip sym53c810a, device id 0x1, revision id 0x23 At PCI address 0000:00:08.0, IRQ 19 Min. period factor 25, Narrow SCSI BUS Max. started commands 448, max. commands per LUN 64 The box currently has 2 * 73GB drives on SCSI Channel 1. Attached devices: Host: scsi0 Channel: 00 Id: 06 Lun: 00 Vendor: ESG-SHV Model: SCA HSBP M6 Rev: 0.63 Type: Processor ANSI SCSI revision: 02 Host: scsi1 Channel: 00 Id: 00 Lun: 00 Vendor: SEAGATE Model: ST373307LC Rev: DS09 Type: Direct-Access ANSI SCSI revision: 03 Host: scsi1 Channel: 00 Id: 01 Lun: 00 Vendor: SEAGATE Model: ST373405LC Rev: 2203 Type: Direct-Access ANSI SCSI revision: 03 Host: scsi3 Channel: 00 Id: 00 Lun: 00 Vendor: CREATIVE Model: CD5233E Rev: 1.00 Type: CD-ROM ANSI SCSI revision: 05 The system has been running the latest fedora kernels from FC7 as they have been released. The current one is 2.6.22.9-91.fc7. However with the FC8 candidate kernel (and the corresponding FC7 one in the testing updates) the Symbios buses fail to initialise properly. Booting'Fedora(2.6.23.1-30.fc8)' root(hd0,0)Filesystem type is ext2fs, partition type 0xfd kernel /vmlinuz-2.6.23.1-30.fc8 ro root=/dev/md0 console=tty0 console=ttyS0,19200n8 audit=0 [Linux-bzImage, setup=0x2e00,size=0x1dfcc0] Linux version 2.6.23.1-30.fc8 (kojibuilder(a)hammer2.fedora.redhat.com) (gcc version 4.1.2 20070925 (Red Hat 4.1.2-32)) #1 SMP Mon Oct 22 18:46:28 EDT 2007 BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009d800 (usable) BIOS-e820: 000000000009d800 - 00000000000a0000 (reserved) BIOS-e820: 00000000000f0400 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 00000000f9ffa800 (usable) BIOS-e820: 00000000f9ffa800 - 00000000f9fffc00 (ACPI data) BIOS-e820: 00000000f9fffc00 - 00000000fa000000 (ACPI NVS) BIOS-e820: 00000000fe900000 - 0000000100000000 (reserved) BIOS-e820: 0000000100000000 - 0000000106000000 (usable) Warning only 4GB will be used. Use a HIGHMEM64G enabled kernel. 3200MB HIGHMEM available. 896MB LOWMEM available. found SMP MP-table at 000f6b70 Using x86 segment limits to approximate NX protection Zone PFN ranges: DMA 0 -> 4096 Normal 4096 -> 229376 HighMem 229376 -> 1048576 Movable zone start PFN for each node early_node_map[1] active PFN ranges 0: 0 -> 1048576 DMI 2.1 present. Using APIC driver default ACPI: RSDP 000F6B50, 0014 (r0 PTLTD ) ACPI: RSDT F9FFABDF, 002C (r1 INTEL S450NX01 0 INTL 1000000) ACPI: FACP F9FFFAFE, 0074 (r1 Intel S450NX 2 INT F4240) ACPI: DSDT F9FFAC0B, 4EF3 (r1 INTEL S450NX1 1 MSFT 1000009) ACPI: FACS F9FFFFC0, 0040 ACPI: APIC F9FFFB72, 008E (r1 Intel Custom 1 INT 10000000) ACPI: PM-Timer IO Port: 0xc08 ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled) Processor #0 6:7 APIC version 17 ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled) Processor #1 6:7 APIC version 17 ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled) Processor #2 6:7 APIC version 17 ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] enabled) Processor #3 6:7 APIC version 17 ACPI: LAPIC_NMI (acpi_id[0x00] low level lint[0x1]) ACPI: LAPIC_NMI (acpi_id[0x01] low level lint[0x1]) ACPI: LAPIC_NMI (acpi_id[0x02] low level lint[0x1]) ACPI: LAPIC_NMI (acpi_id[0x03] low level lint[0x1]) ACPI: IOAPIC (id[0x04] address[0xfec00000] gsi_base[0]) IOAPIC[0]: apic_id 4, version 19, address 0xfec00000, GSI 0-63 ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 high edge) ACPI: INT_SRC_OVR (bus 0 bus_irq 8 global_irq 8 low edge) Enabling APIC mode: Flat. Using 1 I/O APICs Using ACPI (MADT) for SMP configuration information Allocating PCI resources starting at fa800000 (gap: fa000000:04900000) swsusp: Registered nosave memory region: 000000000009d000 - 000000000009e000 swsusp: Registered nosave memory region: 000000000009e000 - 00000000000a0000 swsusp: Registered nosave memory region: 00000000000a0000 - 00000000000f1000 swsusp: Registered nosave memory region: 00000000000f1000 - 0000000000100000 Built 1 zonelists in Zone order. Total pages: 1040384 Kernel command line: ro root=/dev/md0 console=tty0 console=ttyS0,19200n8 audit=0 audit: disabled (after initialization) Enabling fast FPU save and restore... done. Enabling unmasked SIMD FPU exception support... done. Initializing CPU#0 CPU 0 irqstacks, hard=c07a7000 soft=c0787000 PID hash table entries: 4096 (order: 12, 16384 bytes) Detected 550.197 MHz processor. Console: colour VGA+ 80x25 console [tty0] enabled console [ttyS0] enabled Dentry cache hash table entries: 131072 (order: 7, 524288 bytes) Inode-cache hash table entries: 65536 (order: 6, 262144 bytes) Memory: 4053376k/4194304k available (2183k kernel code, 41252k reserved, 1113k data, 280k init, 3178472k highmem) virtual kernel memory layout: fixmap : 0xffc53000 - 0xfffff000 (3760 kB) pkmap : 0xff800000 - 0xffc00000 (4096 kB) vmalloc : 0xf8800000 - 0xff7fe000 ( 111 MB) lowmem : 0xc0000000 - 0xf8000000 ( 896 MB) .init : 0xc073e000 - 0xc0784000 ( 280 kB) .data : 0xc0621e0d - 0xc0738544 (1113 kB) .text : 0xc0400000 - 0xc0621e0d (2183 kB) Checking if this processor honours the WP bit even in supervisor mode... Ok. SLUB: Genslabs=22, HWalign=32, Order=0-1, MinObjects=4, CPUs=4, Nodes=1 Calibrating delay using timer specific routine.. 1101.19 BogoMIPS (lpj=550597) Security Framework v1.0.0 initialized SELinux: Initializing. selinux_register_security: Registering secondary module capability Capability LSM initialized as secondary Mount-cache hash table entries: 512 CPU: L1 I cache: 16K, L1 D cache: 16K CPU: L2 cache: 512K CPU serial number disabled. Intel machine check architecture supported. Intel machine check reporting enabled on CPU#0. Compat vDSO mapped to ffffe000. Checking 'hlt' instruction... OK. SMP alternatives: switching to UP code ACPI: Core revision 20070126 CPU0: Intel Pentium III (Katmai) stepping 03 SMP alternatives: switching to SMP code Booting processor 1/0 eip 3000 CPU 1 irqstacks, hard=c07a8000 soft=c0788000 Initializing CPU#1 Calibrating delay using timer specific routine.. 1100.13 BogoMIPS (lpj=550068) CPU: L1 I cache: 16K, L1 D cache: 16K CPU: L2 cache: 512K CPU serial number disabled. Intel machine check architecture supported. Intel machine check reporting enabled on CPU#1. CPU1: Intel Pentium III (Katmai) stepping 03 SMP alternatives: switching to SMP code Booting processor 2/1 eip 3000 CPU 2 irqstacks, hard=c07a9000 soft=c0789000 Initializing CPU#2 Calibrating delay using timer specific routine.. 1100.17 BogoMIPS (lpj=550087) CPU: L1 I cache: 16K, L1 D cache: 16K CPU: L2 cache: 512K CPU serial number disabled. Intel machine check architecture supported. Intel machine check reporting enabled on CPU#2. CPU2: Intel Pentium III (Katmai) stepping 03 SMP alternatives: switching to SMP code Booting processor 3/2 eip 3000 CPU 3 irqstacks, hard=c07aa000 soft=c078a000 Initializing CPU#3 Calibrating delay using timer specific routine.. 1100.17 BogoMIPS (lpj=550085) CPU: L1 I cache: 16K, L1 D cache: 16K CPU: L2 cache: 512K CPU serial number disabled. Intel machine check architecture supported. Intel machine check reporting enabled on CPU#3. CPU3: Intel Pentium III (Katmai) stepping 03 Total of 4 processors activated (4401.67 BogoMIPS). ENABLING IO-APIC IRQs ..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1 checking TSC synchronization [CPU#0 -> CPU#1]: passed. checking TSC synchronization [CPU#0 -> CPU#2]: passed. checking TSC synchronization [CPU#0 -> CPU#3]: passed. Brought up 4 CPUs Booting paravirtualized kernel on bare hardware Time: 17:00:44 Date: 10/24/07 NET: Registered protocol family 16 No dock devices found. ACPI: bus type pci registered PCI: PCI BIOS revision 2.10 entry at 0xfdb33, last bus=3 PCI: Using configuration type 1 Setting up standard PCI resources ACPI: Interpreter enabled ACPI: (supports S0 S4 S5) ACPI: Using IOAPIC for interrupt routing ACPI: PCI Root Bridge [PCI0] (0000:00) * Found PM-Timer Bug on the chipset. Due to workarounds for a bug, * this clock source is slow. Consider trying other clock sources PCI quirk: region 0c00-0c3f claimed by PIIX4 ACPI PCI quirk: region 0cc0-0ccf claimed by PIIX4 SMB PIIX4 devres B PIO at 0ca2-0ca3 PIIX4 devres C PIO at 0ca0-0ca1 PCI: Searching for i450NX host bridges on 0000:00:10.0 ACPI: PCI Root Bridge [PCI1] (0000:01) ACPI: Bus 0000:01 not present in PCI namespace ACPI: PCI Interrupt Link [IT00] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT01] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT02] (IRQs 3 4 5 7 *10 11 12 14 15) ACPI: PCI Interrupt Link [IT10] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT11] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT12] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT20] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT21] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT22] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT30] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT31] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT32] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT42] (IRQs 3 4 5 7 10 *11 12 14 15) ACPI: PCI Interrupt Link [IT38] (IRQs 3 4 5 7 10 11 12 14 *15) ACPI: PCI Interrupt Link [IT39] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT03] (IRQs 3 4 *5 7 10 11 12 14 15) ACPI: PCI Interrupt Link [IT04] (IRQs 3 5 7 10 *11 15) ACPI: PCI Interrupt Link [IT05] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT06] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT13] (IRQs 3 4 5 7 10 *11 12 14 15) ACPI: PCI Interrupt Link [IT14] (IRQs 3 4 5 7 10 *11 12 14 15) ACPI: PCI Interrupt Link [IT15] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT16] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT23] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT24] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT25] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT26] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT33] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT34] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT35] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT36] (IRQs 3 4 5 7 10 11 12 14 15) *0, disabled. ACPI: PCI Interrupt Link [IT41] (IRQs 3 4 5 7 10 *11 12 14 15) ACPI: PCI Interrupt Link [IT40] (IRQs 3 4 5 7 10 *11 12 14 15) Linux Plug and Play Support v0.97 (c) Adam Belay pnp: PnP ACPI init ACPI: bus type pnp registered pnp: PnP ACPI: found 13 devices ACPI: ACPI bus type pnp unregistered usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb PCI: Using ACPI for IRQ routing PCI: If a device doesn't work, try "pci=routeirq". If it helps, post a report NetLabel: Initializing NetLabel: domain hash size = 128 NetLabel: protocols = UNLABELED CIPSOv4 NetLabel: unlabeled traffic allowed by default Time: tsc clocksource has been installed. pnp: 00:01: ioport range 0xc10-0xc3f has been reserved pnp: 00:01: ioport range 0xca0-0xca7 has been reserved pnp: 00:01: ioport range 0xcc0-0xccf has been reserved pnp: 00:01: iomem range 0xffe00000-0xffffffff could not be reserved pnp: 00:01: iomem range 0xfec00000-0xfec00fff could not be reserved PCI: Bridge: 0000:01:01.0 IO window: 4000-4fff MEM window: fe100000-fe2fffff PREFETCH window: fe700000-fe7fffff PCI: Bridge: 0000:01:02.0 IO window: 5000-5fff MEM window: fe300000-fe4fffff PREFETCH window: fe800000-fe8fffff NET: Registered protocol family 2 IP route cache hash table entries: 32768 (order: 5, 131072 bytes) TCP established hash table entries: 131072 (order: 8, 1572864 bytes) TCP bind hash table entries: 65536 (order: 7, 524288 bytes) TCP: Hash tables configured (established 131072 bind 65536) TCP reno registered checking if image is initramfs...<6>Switched to high resolution mode on CPU 1 Switched to high resolution mode on CPU 0 Switched to high resolution mode on CPU 3 Switched to high resolution mode on CPU 2 it is Freeing initrd memory: 3049k freed apm: BIOS not found. audit: initializing netlink socket (disabled) audit(1193245243.347:1): initialized highmem bounce pool size: 64 pages Total HugeTLB memory allocated, 0 VFS: Disk quotas dquot_6.5.1 Dquot-cache hash table entries: 1024 (order 0, 4096 bytes) ksign: Installing public key data Loading keyring - Added public key 559AEDE0E277CA54 - User ID: Red Hat, Inc. (Kernel Module GPG key) Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253) io scheduler noop registered io scheduler anticipatory registered io scheduler deadline registered io scheduler cfq registered (default) PCI: Firmware left 0000:02:04.0 e100 interrupts enabled, disabling PCI: Firmware left 0000:02:05.0 e100 interrupts enabled, disabling PCI: Firmware left 0000:03:04.0 e100 interrupts enabled, disabling PCI: Firmware left 0000:03:05.0 e100 interrupts enabled, disabling pci_hotplug: PCI Hot Plug PCI Core version: 0.5 isapnp: Scanning for PnP cards... isapnp: No Plug & Play device found Real Time Clock Driver v1.12ac Non-volatile memory driver v1.2 Linux agpgart interface v0.102 Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled ÿserial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A serial8250: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A 00:09: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A 00:0b: ttyS1 at I/O 0x2f8 (irq = 3) is a 16550A RAMDISK driver initialized: 16 RAM disks of 16384K size 4096 blocksize input: Macintosh mouse button emulation as /class/input/input0 PNP: PS/2 Controller [PNP0303:KBC,PNP0f03:MOUS] at 0x60,0x64 irq 1,12 serio: i8042 KBD port at 0x60,0x64 irq 1 serio: i8042 AUX port at 0x60,0x64 irq 12 mice: PS/2 mouse device common for all mice input: AT Translated Set 2 keyboard as /class/input/input1 cpuidle: using governor menu usbcore: registered new interface driver hiddev usbcore: registered new interface driver usbhid drivers/hid/usbhid/hid-core.c: v2.6:USB HID core driver TCP cubic registered Initializing XFRM netlink socket NET: Registered protocol family 1 NET: Registered protocol family 17 Using IPI No-Shortcut mode Magic number: 11:592:37 Freeing unused kernel memory: 280k freed Write protecting the kernel read-only data: 847k Red Hat nash version 6.0.9 starting Mounting proc filesystem Mounting sysfs filesystem Creating /dev Creating initial device nodes Setting up hotplug. Creating block device nodes. Loading uhci-hcd.ko module USB Universal Host Controller Interface driver v3.0 ACPI: PCI Interrupt 0000:00:0c.2[D] -> GSI 54 (level, low) -> IRQ 16 uhci_hcd 0000:00:0c.2: UHCI Host Controller uhci_hcd 0000:00:0c.2: new USB bus registered, assigned bus number 1 input: PS/2 Generic Mouse as /class/input/input2 uhci_hcd 0000:00:0c.2: irq 16, io base 0x00002440 usb usb1: configuration #1 chosen from 1 choice hub 1-0:1.0: USB hub found hub 1-0:1.0: 2 ports detected Loading ohci-hcd.ko module Loading ehci-hcd.ko module Loading mbcache.ko module Loading jbd.ko module Loading ext3.ko module Loading raid1.ko module md: raid1 personality registered for level 1 Loading xor.ko module xor: automatically using best checksumming function: pIII_sse pIII_sse : 1104.000 MB/sec xor: using function: pIII_sse (1104.000 MB/sec) Loading async_tx.ko module async_tx: api initialized (async) Loading async_memcpy.ko module Loading async_xor.ko module Loading raid456.ko module raid6: int32x1 132 MB/s raid6: int32x2 125 MB/s raid6: int32x4 152 MB/s raid6: int32x8 156 MB/s raid6: mmxx1 367 MB/s raid6: mmxx2 417 MB/s raid6: sse1x1 296 MB/s raid6: sse1x2 394 MB/s raid6: using algorithm sse1x2 (394 MB/s) md: raid6 personality registered for level 6 md: raid5 personality registered for level 5 md: raid4 personality registered for level 4 Loading scsi_mod.ko module SCSI subsystem initialized Loading sd_mod.ko module Loading scsi_transport_spi.ko module Loading sym53c8xx.ko module ACPI: Unable to derive IRQ for device 0000:01:03.0 ACPI: PCI Interrupt 0000:01:03.0[A]: no GSI - using IRQ 11 sym0: <896> rev 0x1 at pci 0000:01:03.0 irq 11 sym0: No NVRAM, ID 7, Fast-40, LVD, parity checking sym0: SCSI BUS has been reset. scsi0 : sym-2.2.3 ACPI: Unable to derive IRQ for device 0000:01:03.1 ACPI: PCI Interrupt 0000:01:03.1[B]: no GSI - using IRQ 11 sym1: <896> rev 0x1 at pci 0000:01:03.1 irq 11 sym1: No NVRAM, ID 7, Fast-40, LVD, parity checking sym1: SCSI BUS has been reset. scsi1 : sym-2.2.3 ACPI: PCI Interrupt 0000:00:08.0[A] -> GSI 58 (level, low) -> IRQ 17 sym2: <810a> rev 0x23 at pci 0000:00:08.0 irq 17 sym2: No NVRAM, ID 7, Fast-10, SE, parity checking sym2: SCSI BUS has been reset. scsi2 : sym-2.2.3 Loading dm-mod.ko module device-mapper: ioctl: 4.11.0-ioctl (2006-10-12) initialised: dm-devel(a)redhat.com Loading dm-mirror.ko module Loading dm-zero.ko module Loading dm-snapshot.ko module scsi: waiting for bus probes to complete ... scsi 0:0:0:0: ABORT operation started. scsi 1:0:0:0: ABORT operation started. scsi 0:0:0:0: ABORT operation timed-out. scsi 0:0:0:0: DEVICE RESET operation started. scsi 1:0:0:0: ABORT operation timed-out. scsi 1:0:0:0: DEVICE RESET operation started. scsi 0:0:0:0: DEVICE RESET operation timed-out. scsi 0:0:0:0: BUS RESET operation started. scsi 1:0:0:0: DEVICE RESET operation timed-out. scsi 1:0:0:0: BUS RESET operation started. scsi 0:0:0:0: BUS RESET operation timed-out. scsi 0:0:0:0: HOST RESET operation started. sym0: SCSI BUS has been reset. scsi 1:0:0:0: BUS RESET operation timed-out. scsi 1:0:0:0: HOST RESET operation started. sym1: SCSI BUS has been reset. scsi 0:0:0:0: HOST RESET operation timed-out. scsi 0:0:0:0: scsi: Device offlined - not ready after error recovery scsi 1:0:0:0: HOST RESET operation timed-out. scsi 1:0:0:0: scsi: Device offlined - not ready after error recovery scsi 0:0:1:0: ABORT operation started. scsi 1:0:1:0: ABORT operation started. scsi 0:0:1:0: ABORT operation timed-out. scsi 0:0:1:0: DEVICE RESET operation started. scsi 1:0:1:0: ABORT operation timed-out. scsi 1:0:1:0: DEVICE RESET operation started. and so on until all devices on all 3 buses have timed out! Anybody got any suggestions? Ones that I may want to act on :-) Apologies for the length of the Email but I am trying to provide sufficient information in the first shot this time. Regards, Howard -- Howard Wilkinson Phone: +44(20)76907075 Coherent Technology Limited Fax: 23 Northampton Square, Mobile: +44(7980)639379 United Kingdom, EC1V 0HL Email: howard(a)cohtech.com