SCSI-2 Fast/Wide Adapter/A  FRU 92F0160
SCSI-2 Fast/Wide Adapter/A Specs
Differential SCSI-2 Fast/Wide Adapter FRU 11H3599
   Fast/Wide in 8590/8585
   80C188 vs. 80C186
   Three Port Operation
   PTC Function
   PLCC Socket on Fast/Wide
   Jumpers on the Fast/Wide
   68 pin Internal Connector
   Drive connector
   SCSI device and adapter configuration flexibility 
   SCSI Device Order
   Maximum SCSI Devices Supported
   Fast POST Consequences
Configuration Options @8EFC.adf 4/10/95
   I/O Address 
   DMA Arbitration Level
   SCSI Adapter Address (ID)
   Move Mode Support
   Wait State Support
   Data Parity Exception Handling
   Selected Feedback Return Exception
   100ns Streaming Data Transfer Support
   Target Mode
   SCSI Disconnect
   Fast SCSI - External
   Wide SCSI messages - External
   Wide SCSI messages - Internal
   Internal/External Bus Mode
System Determined
   ROM Address Range
   ESDI Requirements

°   IBM SCSI-2 Fast/Wide Adapter/A 

       The IBM SCSI-2 Fast/Wide Adapter/A is a SCSI-2 adapter that IBM has announced as an option for it's range of PS/2s.  Fast refers to a data transfer method. With fast, data is moved to fixed disks at 10MBps--twice the speed of SCSI 1.  Wide refers to the bus width which  is increased from 8 to 16 bits, enabling transfers of up to 20MBps. 
       The IBM SCSI-2 Fast/Wide Streaming Adapter/A is a high performance SCSI-2, 32-bit Micro Channel 40MBps Data Streaming bus master adapter. It has dual SCSI-2 16-bit, fast and wide channels (one 20MBps internal, one 20MBps 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.  This allows for additional capability externally. 
       This adapter has a dedicated 80C186 local processor on-board.  It supports SCSI Tagged Command Queuing (TCQ) which increases performance in DASD-intensive server environments. With SCSI-1 systems, only two commands could be sent to a fixed disk - the disk would store one while operating on the other. With TCQ it is possible to send multiple commands to the fixed disk, and the disk will store the commands and execute each command in the sequence which will give optimal performance. 
       The supporting cables and terminators allow attachment of SCSI devices internally or externally for PS/2 Models 8590/95 and 9585/90/95.  Up to seven SCSI physical devices may be attached. The IBM SCSI-2 Fast/Wide Adapter/A also supports standard 8-bit SCSI devices using either asynchronous, synchronous, or fast synchronous (10MBps) SCSI data transfer rates per ANSI Small Computer System Interface 2 (X3T9.2/375R REV10K) for SCSI-2 features. 

1 61G3929, SCSI BIOS, Odd  2 61G3930, SCSI BIOS, Even U3 82G2645 Internal port SCSI controller U4 AMD N80C186-20 U5 61G2323 MCA Bus interface U6 82G2645 External port SCSI controller

P PLCC socket.  A TR30, PTC resistor for the internal bus B TR29, PTC resistor for the external bus OS1 40MHz SMD Oscillator J4, J5, and J8 Leave open. Not used. J7 Serial port.

PLCC Socket Marked as empty or not present in RS6K documentation

Jumpers Leave all open. Not used.

J7 Pinout

NC	RXD
ALVE	TXD
BUR	GND

  The six pin serial port J7 was intended for the use with an earlier system management adapter, which didn't made it to the salesroom. The idea was to supply a sort of status-link to the processorboard and the SCSI-adapter(s) and the (possible) backplanes on the later servers. 

25 May 00 - I was surfin through IBM's patent info/Tech Discovery Bulletins, and I found a TDB that identified the Burn/Alive/TXD/RXD as being used to flash certain components. Of course I didn't bookmark it... Basically, factory use only.

    Contact tab 20 preferably has ten contact pads 21, with five such pads on each side of card 10. Three of these pads 21 are connected to the ground plane of card 10, and two of these pads are connected to the plus five-volt plane. The remaining five pads 21 are connected to transmit signals, with an RXD (receive data) input signal line being paired with a TXD (transmit data) output signal line to form a serial data link to the card, having a protocol similar to that of the RS-232 interface. A typical application of this kind of data link includes connection to an ASYNCH port on the local processor of card 10. Alternately, a two-bit I/O port controlled by software timing  loops may be connected. Two other input lines supply the CHRESET (channel reset) signal, which is the general reset signal of the system bus, and the BURNIN signal, which is an active low signal to the adapter, establishing a special burn-in mode. For example, the adapter may use this signal to branch to a special set of diagnostic microcode. A pull-up resistor on the feature card renders this signal inactive during normal operation and offers protection against electrostatic discharge. Finally, an output line transmits the ITSALIVE signal, an active high signal indicating the status of card 10. 
    The status report of the ITSALIVE signal can be as simple as driving the associated line to a high level for 1/2 second after the completion of each diagnostic loop. This information can be used within the test fixture to drive an LED in various  flashing patterns, indicating the condition of the card under test. 

80C188 vs. 80C186 
  Older adapters (SCSI, SCSI w/cache) use an 80C188-16 microcontroller as busmaster-CPU, the Fast/Wide uses an 80C186-20 busmaster CPU.
   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. 

Three Port Operation
   You should not run both internal ports and the external port all at once. I have done just that for over six months with no significant problem, but it makes the SCSI drive circuitry work harder than it should.

Fast/Wide in 8590/8585
   If you are not running a Type 4 complex, you may not be able to use some features of the Fast/Wide, most notably Internal/External Bus Mode. You need to run SCSI2FW.EXE to update the system partition. 

  The SCSI-2 Differential Fast/Wide Adapter/A supports an internal single-ended and an external differential SCSI bus. To date, all attempts to get this RS/6000 adapter to work in a PS/2 have failed. Although the chipset is the same as on the Fast/Wide, the rev .71 flash update does not recognize a F/W chipset. I wonder if there is a way to zeroize the adapter flash rom and reflash it with PS/2 compatible code.
      Some idle thoughts. Both the Fast/Wide and the Differential Fast/Wide were both announced for the RS6000, with NO mention of the PS/2. I brought up a system with a differential in it- it responded as a Fast/Wide with NO renaming of the ADF. Well, one DFW responded. Different rework styles.
   All of my attempts to flash the differential F/W have failed. Both Differential F/W will not sucessfully configure with a Type 4 complex or in a Lacuna 76s planar.

MF-SM Series MF-SM150

Jumpers on Fast/Wide
   The results of shorting the jumpers ranged from no difference, slight performance hit (%10 overhead increase) or a system-halting error. Leave them off. RS6000 documentation says the jumpers are to be left open.
   Jumper J5 has a lead going to U6, chip 82G2645. Purpose unknown.
   Jumper J8 has a lead going to U5, chip 61G2323. Purpose unknown.
   Jumper J4 has a lead going to U3, chip 82G2645. Purpose unknown.

68 pin Internal Connector
Newark Electronics 97F8813  $6.66

Drive connector
The 68 pin crimp-on device connector. Dalco 59611  $4.25

SCSI Device Order
   SCSI device logical ordering and hard drive letter assignment (e.g. C:, D:) sequence is determined by the SCSI adapter slot numbers, internal or external SCSI bus connection, and SCSI ID of the connected devices. 
   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. 

Maximum SCSI Devices Supported
   Wide SCSI devices support 16 possible SCSI ID values.  The adapter uses one these values; therefore, the SCSI-2 Fast/Wide adapter can connect up to 15 fast and wide devices internally or externally in any combination using the remaining ID values.  Narrow SCSI devices support 8 possible SCSI ID values; therefore, up to 7 narrow SCSI devices can be connected to the internal or external SCSI busses in any combination using the remaining ID values.  Wide and narrow devices may be mixed on the same internal/external bus by using the proper combinations of SCSI bus cables, terminators, and/or SCSI connector convertor adapters.
   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.

Fast POST Consequences
   Some newer systems also provide a FAST POST option which may be selected from the system configuration menu or from the IBM logo screen.  When this option is selected, the system will not check for the presence of newly added SCSI devices unless F1 is also pressed while the IBM logo is displayed.  Newly added SCSI devices will not be configured nor will an error occur if the fast post option is chosen as the default.  To access the system configuration program, press F1 while the IBM logo screen is displayed to configure the new SCSI  device(s) initially. 

I/O Address 
   This allows you to choose the I/O address for the adapter. Each adapter must have a unique address range. Normally this address range does not need to be changed. 
   I/O Addresses available are: <3540-3547>, 3548-354F, 3550-3557, 3558-355F, 3560-3567, 3568-356F, 3570-3577, 3578-357F, 3578-357F

DMA Arbitration Level
   Choose the Arbitration level used by the adapter to transfer data.
   Arbitration Levels available are: <C>, D, E, 8, 9, A, B, 1, 3, 5, 6, 7

SCSI Adapter Address (ID)
   This allows you to change the SCSI ID of the adapter. 
   Adapter IDs available are: <7>, 6, 5, 4, 3, 2, 1, 0

Move Mode Support
   Allows you to Enable or Disable Micro Channel Subsystem Control Block Move Mode This is the second mode of SCBA (first is locate mode) which permits the system processor to move the subsystem control blocks to the adapters directly.
   <Enabled> or Disabled

Wait State Support
   Allows you to Enable or Disable Bus Master wait states for this adapter. If the target expansion card is an older card, it may not be able to process commands or data from the busmaster fast enough, and when queried by the busmaster, it replies with "not ready". By inserting a wait state, the slower card has more time to signal "ready". Enabling wait states can slow your busmaster down.
   <Disabled> or Enabled

Data Parity Exception Handling
   This Adapter can generate and detect data parity on Micro Channel. Data parity must be supported on both ends of an across-the-bus transmission in order for this error detection process to be effective. A data parity enable (-DAPAREN) bus line to the system and other expansion boards is enabled when data parity is being used. If the System does not support Data Parity Exception Handling, this feature will always be disabled.
   <Enabled> or Disabled

Selected Feedback Return Exception
   This Adapter supports the Micro Channel Selected Feedback Return Exception feature. This feature controls whether a busmaster expansion board will report errors detected in the select-feedback-return process. 
   When enabled, the busmaster monitors the selected feedback return and card-selected feedback buslines. The return line tells the master that it's target expansion board is responding properly to being addressed for a read or write operation. If the bus master does not recieve this signal (and SFR has been enabled) it may mean that the expansion board is not operating properly or that the signals themselves are not properly traveling across the expansion bus. This error causes the master to immediately halt the transfer in progress and notify the host system of the error using an interrupt. NOTE: The SFR must be ignored for PC compatibility. If the System doesn't support the Selected Feedback Return feature, it will always be ignored.
   <Enabled> or Ignored

100ns Streaming Data Transfer Support
   This Adapter supports 100ns Streaming Data Micro Channel protocol, which provides better performance on Micro Channel. If the system doesn't support this feature it will always be disabled.
   <Enabled> or Disabled

Target Mode
   Target mode should be disabled only if this system is sharing SCSI devices with another system and there are more than 15 devices to be shared.  Only 15 devices can be configured on each adapter. When target mode is enabled, this adapter appears as a processor device on the other system and unless you have specialized software that can communicate between the two systems through these processor devices (peer-to-peer communication), there is no advantage in having
target mode enabled.  When target mode is disabled, this adapter does not appear as a device to the other system, and one more device can be shared by the two systems.  If your system is not sharing any SCSI devices with another system on this adapter, it does not matter whether you enable or disable target mode. 
   <Enabled> or Disabled

SCSI Disconnect
   Disconnect is a SCSI-bus procedure in which a device logically stops communicating with the adapter during certain operations and then reestablishes communication with the adapter when the operation is complete.  Disconnect should not be confused with the 'Presence Error Reporting' option for a device in 'Set and view SCSI device configuration.'  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.
   <Enabled> or Disabled

Fast SCSI - External
   If you have one or more Fast SCSI devices attached externally in one of the following configurations on this adapter, enabling Fast SCSI external improves performance :
  - One external SCSI device enclosure model 3511.
  - Up to three external SCSI device enclosures model 3510.
  - Any external configuration where the SCSI cable length does not exceed 3 meters.
Refer to the device's documentation to determine whether it is a Fast SCSI device.
   <Disabled> or Enabled

Wide SCSI messages - External
   This should be 'Enabled' unless you have a Wide SCSI device attached to the adapter through a narrow (8 bits wide) external interface cable.  (What about a narrow device on a 68 to 50 pin cable?) Refer to the device and cable documentation to determine whether it is necessary to disable Wide SCSI messages.
   <Enabled> or Disabled

Wide SCSI messages - Internal
   The setting for this should be 'Enabled' unless you have a Wide SCSI device attached to the adapter through a narrow (8 bits wide) internal interface cable. Refer to the device and cable documentation to determine whether it is necessary to disable Wide SCSI messages.
   <Enabled> or Disabled

Internal/External Bus Mode
   When set to 'Separate', SCSI devices connected to the external SCSI bus connector for this adapter can have the same SCSI ID setting as other SCSI devices connected to the internal SCSI bus connector on the same adapter.  When set to 'Combined', all devices connected to this adapter 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 the adapter.
    <Separate> or Combined

System Determined
ROM Address Range
   This shows the address of the 32K block of memory that is assigned to the adapter.  Only one SCSI Adapter will have the ROM assigned, and any other SCSI Adapter installed will share that address range. (Why this exists is a good question. It says No System Resources, and it's not editable).

ESDI Requirements
   If the ESDI adapter is also installed, then the address of the SCSI adapter must be greater than the ESDI adapter address.