@8EFC.ADF - IBM PS/2 Fast/Wide SCSI Adapter
C8EFC.ADF - Init file for @8EFC.ADF
rev71upd.exe SCSI-2 Fast/Wide Adapter Firmware Upgrade 7.1
corv77.exe SCSI-2 Fast/Wide Firmware rev7.7
ibm2.exe F/W and OS/2 2.1 Fix '94 (ibm2scsi.add and ibm2m57.add)
scsi2fw.exe SCSI-2 F/W Support Diskette v2.0
193-294 SCSI-2 F/W Adapter/A
194-145 SCSI-2 F/W Adapter/A, SCSI-2 Differential F/W Adapter/A
SCSIFIX.ZIP Finally! A utility to alter the number of sectors for a SCSI drive and convert them to a 3.94GB drive! Bob Eager, you have answered a prayer!
Fast/Wide SCSI-2 Adapter/A FRU 92F0160 "Corvette"
U3 and U6 are
Sort of a different way to identify things. My SWAG:
Actually means a "B630T" made in 1992, 20th week.
LED Flash Codes
- All SCSI-2 F/W adapter versions (Corvette SE, DE, Enhanced/Turbo, and Integrated) have an onboard LED indicator that aids in problem debugging.
- At power ON, the LED stays lit until SCSI POST executes (RS6K, system LED=292). If SCSI POST is successful, the LED turns off.
- If there is a hardware failure, the LED flashes a failure code. The failing component is identified by LED blinks, a pause, then a repeat of the blinking code again, over and over.
A blink code of 3, 8, or 10 may indicate a configuration problem like a shorted cable or bad device, or duplicate SCSI addresses on the same bus.
LED stays solidly lit after SCSI POST executes -
replace SCSI controller.
- Example: If the LED blinks 8 times, this indicates a bad internal SCSI bus. First, remove the internal SCSI cable from the SCSI Controller. If the problem persists, replace SCSI Controller. If not, add the cable and SCSI devices back (one at a time) until LED again starts to blink.
Possible MCA Bus Controller Problems (RS/6000 Specific, but may affect PS/2s?)
Some MCA bus controller chips, P/N 61G2323 (Malibu), can cause system problems. The third line is the datecode. The following datecodes are suspect:
The entire datecode is not bad, but because of this, the whole lot is suspect. If you have any of the symptoms below, keep in mind the SCSI-2 F/W adapter may be the problem.
There are three types of symptoms you may
(*): The Integrated SCSI-2 F/W controller is
the one on the I/O planar of the 7012-380/390/39H and
Running Wide Devices on Narrow Cables
The Corvette automatically terminates it's end of the SCSI bus with termination networks on the back side. However, some user intervention IS required within System Programs.
Uli Link replies:
Not in terms of termination.
Some combinations of Narrow and Wide devices on a Corvette
8EFCh "IBM PS/2 SCSI-2 Fast/Wide Adapter/A" or planar
"Wide SCSI messages - Internal"
Server 85 - Sharing External SCSI DASD fails
External SCSI DASD expansion shared between two system fails when one of the systems is powered down. Systems affected : 9585 0N* MCA SCSI-2 Fast/Wide controller card
On the 9585 0N* the trace on the solder
(back) side of the planar running parallel below
resistor R351 must be cut. On the SCSI-2 F/W controller
the trace running next to C30 on the component side of
the card must be cut. This trace runs from the fourth
pin from the right on the bottom of the larger IC next
to the external connector.
On the Corvettes in my possession, some have no trace
at all from the fourth pin, nor is there a C30 on the
PCB. Others have it. YMMV.
The Corvette is a SCSI-2, 32-bit MCA 40MBps Data Streaming bus master adapter with dual SCSI-2 16-bit, F/W channels (one 20MB/s internal, one 20MB/s external). The dual bus of the adapter prevents access to internal DASD from the external port and also allows the maximum cable length to be calculated individually for each bus. Data transfer rates for 8 bit SCSI up to 10MB/s, 16 bit devices up to 20MB/s.
The Corvette supports SCSI Tagged Command Queuing (TCQ), making it possible to send multiple commands to the fixed disk, and the disk stores the commands and execute each command in the sequence which will give optimal performance. Standard 8-bit SCSI devices are supported using either asynchronous, synchronous, or fast synchronous (10MBps) SCSI data transfer rates.
RS/6000 SCSI-2 Fast/Wide Boot
F/W ADAPTER (4-6, 4-7, 4-C) BOOT SUPPORT
Update Corvette Flash
From Uli Link over in Germany
Run rev71upd.exe It creates a bootable floppy -
01-19-96 6:40p REV71.BIN
Copy Rev77.bin to a:, Edit a:\autoexec.bat:
You can use "downcorv.exe" instead of "downnew.exe" "downnew.exe" checks for flashing only newer firmware into corvette. "downcorv.exe" is even able to downgrade.
If you flash the DOS way, the new firmware level is NOT recognized by AIX. To flash a PS/2 corvette in a RS/6000 rename 8EFC3011.77M to 8EFC0001.77M. Now the firmware level 077 is recognized by AIX. The adapter still will work in a PS/2 and can be downgraded back to 071 or even 058.
Tested with 3 corvettes in RS/6000 C10 and
2 Lacunas. No problems so far. But no problems before
How Many is Enough?
Tim Clarke uttered this after a pint of warm beer:
All **IBM** SCSI CBIOS-flavour (i.e. *not* FD MCS700 OEM) will share IRQ14 and you only need one BIOS ROM enabled to drive multiple adapters. So, for example you *should* be able install (in the same slot-type, please) IBM F+W SCSI-2 "Corvette", IBM SCSI w/cache ("Spock") and IBM SCSI w/o cache ("Tribble") in the same PS/2. No naughties like AHA1640, Storage Dimensions unless you disable their BIOS ROMs and assign a different IRQ.
Both CPUs however are integrated CPUs
with 2 8-bit parallel-ports, the -188 has 8-bit external
data-path, the -186 has 16-bit external data-path and
slightly different (enhanced) command set.
There is one PTC for the internal SCSI bus and another for the external bus. The PTC protects the SCSI bus from high currents due to shorts on the cable, terminator, or device. It is highly unlikely that the PTC resistor can be tripped by a defective adapter.
A fault (short circuit) causes an increase in PTC resistance and temperature. The increase in resistance causes the PTC resistor to halt current flow. The PTC resistor returns to a low resistive and low temperature state when the fault is removed from the SCSI bus or when the system is powered off. Wait 5 minutes for the PTC resistor to fully cool, then reset.
MF-SM Series MF-SM150
PLCC Socket on Fast/Wide
The PLCC Socket U7 was possibly to provide a RS/6000 BIOS, and the jumper J5 might have been to enable it. RS/6000 documentation says that the PLCC socket is unused.
68 pin Internal Connector on F/W SCSI Adapter
This is a "mini-Centronics" plug. The ANSI moniker for it is a "P" plug. 80 pin version seems to be used for SCA drives... Hmm... It used to be you could find many IBM P/2 or RS/6000 cables and you could pick and choose the exact one for your PS.2. Nowadays, there are a lot more HPDB68 SCSI connectors to IBM SCSI controllers
AMP (Tyco) # 1-557089-2 Obsolete, but old stock available here and there...
CHAMP 050,68P A/P RCPT,25 CL CHAMP. 0.050 I Series Interface Connectors
For VMC Applications: 68-Position Designed for 30 AWG solid conductors on .064mm (.025") centers.
TE Connectivity (Molex) #
1734098-7 Active part.
Status is "Obsolete" and "Replacement:Contact Molex" Odd, all the 071660 series board receptacles are still active... Go figure.... I suspect there are a few on the Internet...
EBBI™ 50D - Receptacle, Vertical, IDT 71660i
30 AWG solid or stranded .025" ribbon cable or laminated discrete wire cable
68 Pin External Conductor
I'll be darned if I know who made the leaf connector. From my lurking about, the peculiar connector is called the "MDX" and is made from unobtanium.
HPDB68 Cables with MCX Ports
Use of this interposer is simple. Use the thumbwheels to fasten the interposer onto the F/W adapter. Screw on the HPDB68 socket. Power on and compute.
"INTERPOSER 68 HIGH TO 68 STANDARD" IBM P/N 05H3834,
"05H3834 is an IBM part number for a SCSI interposer
which was only needed for the old tape/disk controller
card feature card #6501. It is a passthrough type
connector, with male pins on one side and female pin
receptacles on the other side.
SCSI device and adapter configuration flexibility
Systems with the enhanced SCSI device and adapter support allow up to 8 IBM PS/2 SCSI adapters of any type to be installed in a single system. The maximum number of SCSI devices which many be configured in these newer systems has also been increased from 60 to 120. However, other factors, for example, the type of devices (optical, etc.), cooling requirements, or power consumption of the devices may limit the number for a particular system.
SCSI Device Order
Adapters are scanned for SCSI devices beginning with the SCSI adapter in the lowest numbered slot. Devices connected to the same adapter are logically ordered according to device SCSI IDs in order from 7 to 0 and then from 15 to 8 according to the priority scheme defined by the SCSI standard. Devices connected to a SCSI-2 Fast/Wide adapter's internal bus connector are ordered logically before devices connected to the external bus of the same adapter.
SCSI Devices Supported
NOTE: Use of a 8 bit (Narrow) cable forces the controller to default to only 7 devices supported on that port, even if all devices on that cable are Wide.
ADF Sections @8EFC.adf 4/10/95
DMA Arbitration Level
SCSI Adapter Address (ID)
Move Mode Support
Wait State Support
Data Parity Exception Handling
Selected Feedback Return
The SFR must be ignored for PC compatibility. If the
System doesn't support the Selected Feedback Return
feature, it will always be ignored.
100ns Streaming Data Transfer
If you are using an operating system that
is single-threaded and issues commands to only one
device at a time (such as DOS or
Win95), disabling SCSI disconnect might
result in a slight performance improvement. If
your operating system is multi-threaded (such as OS/2),
disabling SCSI disconnect will degrade the performance
of the SCSI subsystem.
Fast SCSI - External
'Enabled' if external Wide SCSI device attached with WIDE (16 bit) cable.
'Disabled' if external Wide SCSI device attached with NARROW (8 bit) cable -OR-
if an external Narrow SCSI device is attached with a NARROW (8 bit) cable.
NOTE: "Disabled" applies termination to the High Byte on the adapter itself.
<Enabled> or Disabled
Wide SCSI messages - Internal
'Enabled' unless a Wide SCSI device is attached through a narrow (8 bits wide) cable.
NOTE: This is almost always using a Wide drive on the 50 pin edgecard connector.
<Enabled> or Disabled
Internal/External Bus Mode
'Combined', all devices must have
unique SCSI ID settings regardless of which SCSI bus
connector is used to attach the devices. Default
is 'Separate' unless you are using an operating system
device driver that does not support independent
operation of the internal and external SCSI busses on
SCSI-2 Fast/Wide Adapter/A Specs