Gearbox 800 (7568)
The mean nasty guy that outbid me for the D40 pictured below is Tony Ingenoso 

This is his pictorial of it-    The Gearbox 800 lives!

Tony's First Impression
   A casual inspection of its processor pod (not Mod 95 compatible BTW) shows a total of 5 simm sockets all populated with some sort of 8M modules I haven't bothered to look up yet.  Hotrod possibilities are probably limited to a DX4 Overdrive...there may not be enough clearance in the carrier for anything like a TC with a fan.
   The passive backplane sockets are similar to the Mod 80's planar memory card sockets, only there's two of them mounted end to end  for each adapter module you plug in -- i.e. its "microchannelness" doesn't happen on the backplane.  The card carrier modules implement the MCA slots internally
   Externally this machine is virtually identical to the 286 and 386 Gearboxes I encountered when working in Boca.  I'd really like to find one of the microchannel 286 Gearboxes someday -- those are the ones that could accept a special card carrier allowing use of some ISA cards.  That ability went away when the 386 Gearbox came along.  I suspect most of the idiot recyclers who encounter them are scrapping'em straight away because they're "only 286's", and don't realize *THAT* machine is the most rare and unique PC compatible 286 machine ever produced.  It wouldn't suprise me if none of them ever survive the crusher.



Model 150
US_7568.EXE Reference Diskette
M41G3668.EXE 7568 Reference Companion Diskette Image

Model C40
7568_C40.EXE Reference Diskette
M41G3668.EXE 7568 Reference Companion Diskette Image

Model D40
M82G3252.EXE Reference Diskette

Miscellaneous
SCSITAPE.DGS 7568 Streaming Tape Diagnostics
@8EF7.ADF 7568 FDDI Support ADF
@8FDA.ADF 7568 XGA-2 Support ADF for 7568 with 12MB+ of memory
@8FDB.ADF 7568 XGA Support ADF for 7568 with 12MB+ of memory
RPQ1199.EXE Option Diskette for 7568 R/W optical support



IBM GEARBOX MODEL 800 (7568-D40)
   Intel 486 DX2-50 processor card supporting up to 32MB of error correcting code memory, the XGA Display Adapter/A, up to four internal SCSI fixed disk drives and installation of an IBM FDDI Workstation Base Adapter (either fiber or copper), in a single attach station configuration.
   Disk drive recovery capability is provided by the OASAS software.

IBM operating system products compatible with the 7568-D40:
o IBM DOS, Version 5.0 (2)
o OS/2 Standard Edition (SE), Version 1.30.2 (2)
o OS/2 Extended Edition (EE), Version 1.30.2 (2)
o OS/2 Version 2.0
o Extended Services for OS/2, Version 1.0
o OS/2 LAN Server Version 2.0 -- Entry (for OS/2 SE Versions 1.3 and 2.0)
o OS/2 LAN Server Version 2.0 -- Advanced (for OS/2 SE Version 1.3)
o AIX (R) PS/2, Version 1.2.1 (Requires PTF Level 210800, or later).

(2) Earlier levels are no longer formally supported by IBM. In addition, certain D40 system hardware capabilities may not be supported by such earlier versions (for example, DOS Version 3.3 supports no more than two fixed disk drives).

Use of OS/2 SE and EE Versions 1.2 and 1.3 will result in a "system hang" problem when Control-Alt-Delete (C-A-D) is entered. If C-A-D is entered, the system must be reset or powered down and restarted. This is the same as on the previous C40 system.

GEARBOX Language Extensions are available for various operating systems. Language Extensions provide the ability to take full advantage of the unique error notification and orderly shutdown/startup capabilities of the GEARBOX Model 800 system.
Available products are:
o GEARBOX Language Extensions for PC DOS
o GEARBOX Language Extensions for OS/2
o GEARBOX Language Extensions for AIX PS/2.

COMPATIBILITY: The 7568-D40 is compatible with earlier models of the GEARBOX Model 800. The 486 DX2 50MHz Processor Card is compatible with and may be installed in earlier versions of the Model 800. Full support for 8MB memory modules and for system memory greater than 16MB requires that this feature be installed in earlier Model 800 systems. The 7568-D40, and earlier systems with the 486 DX2 50MHz Processor Card installed, do not support the 0-16MB Extended Memory Adapter (#6345)

Initial setup and loading of diagnostic software on the D40 system with no DASD require the use of the Setup and Service Device (#6230).

Installation of supported PS/2 form factor Micro Channel adapters in the GEARBOX Model 800 system require the use of the applicable interposer card to interface with the system backplane. Available interposer cards are feature numbers 6224, 6225 and 6875.

Support for the PS/2 XGA Display Adapter/A requires that the System Resource Card Graphics Support Upgrade (#6886) be installed on earlier models of the GEARBOX Model 800. Support for the XGA Display Adapter/A (and for all other adapters that exclusively use 32-bit slots) also requires that the 32-Bit Micro Channel Adapter Interposer (#6875) be used when installing these adapters. Using a 16-Bit Micro Channel Adapter feature (#6224) may lead to functional problems related to a specific adapter's use of a memory block above the 16MB level. Adapters that require 32-bit slots should be used only with the 32-Bit Micro Channel Adapter Interposer.

32-bit Micro Channel adapters that can be installed in either 16- or 32-bit slots may have improved functional performance if they are installed using a 32-Bit Micro Channel Adapter Interposer.

Installation of the 7568 Auxiliary DASD Module is supported only in C40 or D40 systems, or in 040 or 150 systems that have had either the 80486 Processor Card Upgrade Kit (#6543) or the 486 DX2-50MHz Processor Card Upgrade (#6872) installed on the system.

Installation of the 7568 Auxiliary DASD Module also requires that the base system have a Disk Module installed, either as part of the original system or as the Disk Module feature (#6222).

Installation of the 400MB or 1.0GB SCSI Fixed Disk Drives (#6873 and #6874 respectively) in earlier 040 or 150 systems requires Reference Diskette Version 1.20 for proper setup and diagnostic support.

Diagnostics for these systems does not report the capacity of a defective disk drive.

o Mixing of 4MB and 8MB Memory Modules Prohibited All memory modules installed on the processor card of the D40 system or on the 486 DX2 50MHz Processor Card feature installed in earlier GEARBOX models, must be of the same type (4MB or 8MB). The mixing of 4MB and 8MB modules on a single processor card results in a system memory error. Support of system memory levels above 16MB, therefore, requires that all modules on the processor card be the 8MB type.

o Maximum Memory: There are five memory module positions on the processor card. One of these positions is for a memory module that is dedicated to providing error correcting code (ECC) capability, and is therefore not available as system memory. This leaves four module positions that are available for system memory. For 7568-D40 systems the total maximum system memory is 32MB. This level requires installation of five of the 8MB memory modules (one for the ECC position and four for system memory).

o Available User Memory
Limitations Memory available to the user will be less than the total system memory installed on the processor card for several reasons, depending on the level of installed memory and the requirements of installed adapter card features.

1. BIOS Mapping
 BIOS is moved into system memory during system verification and initialization (SVAI). This requires 128KB of system memory and applies at all total memory levels.

2. Loss of Split Memory
At memory levels of 16MB or greater an additional 256KB of split memory is lost to the user. 

3. Memory "Gap" Support
If an adapter card requires some system memory below the 16MB level, an additional 2MB of memory will be lost to the user if installed memory levels are 16MB or greater. This will vary based on individual adapters.

o Summary
Available user memory is affected by all three of these reasons, depending on the specifics of a particular system configuration. If five of the 8MB memory modules were installed on the processor card, including one module dedicated to providing ECC, the resulting available user memory could be as follows:

   32MB = 32768KB Total system memory
- 128KB Required for BIOS (0.125MB)
- 256KB Loss of split memory mapping (0.250MB)
- 2048KB Memory gap support to adapters (2MB)
-------
= 30336KB Net available to the user

Net: Memory available to the user can be up to 2.375MB less than total system memory. This applies at total memory levels of 16MB or greater, if an adapter requires use of the 2MB "gap".

Thus system memory versus memory available to the user will be as follows for the various levels of installed memory.

SYSTEM MEMORY (MB) USER MEMORY (MB)
4 3.875
8 7.875
12 11.875
16 13.625 minimum 15.625 maximum
24 21.625 minimum 23.625 maximum
32 29.625 minimum 31.625 maximum

No power cord is provided with the GEARBOX products. Direct wiring to an applicable power source must be provided by the customer.

Installation of supported PS/2 form factor Micro Channel adapters in the GEARBOX Model 800 system require the use of the applicable interposer card to interface with the system backplane. Available interposer cards are feature numbers 6224, 6225 and 6875.

Three Port Cable Assembly provides a means for connection from the system resource card to various other standard connectors.

The GEARBOX Model 800 is a direct-wire system, using a customer-provided power cable to an applicable power source.

Additional diagnostic and defective part isolation assistance is available in the Maintenance Information publication (S15F-8611), which may be purchased separately. If this publication has been purchased previously, a complete revision to the page content may be purchased separately (#6879) (U.S. English).
DESCRIPTION 
NUMBER
PRICE
486 DX2 50MHz Processor Card for MT 7568
6872
$3500
System Resource Card Graphics Support Upgrade
6886
$150
400MB SCSI Fixed Disk Drive for MT 7568 
6873
$2200
1.0GB SCSI Fixed Disk Drive for MT 7568
6874
$5000
No Interposer Feature
6835
N/C 32-Bit MCA
Adapter Interposer 6875 200 7568 Aux DASD Module
6885
$925

GEARBOX MODEL 800 (7568-C40)
Intel 80486DX-25  processor card which can be used to upgrade earlier models. The C40 supports the 4MB memory module and 320MB Small Computer System Interface (SCSI) disk drive. The C40 supports attachment of the PS/2 3.5-inch Rewritable Optical Drive in the PS/2 SCSI Storage Enclosure. 

Attachment support for the PS/2 3.5-inch Rewritable Optical Drive in the PS/2 SCSI Storage Enclosure requires that GEARBOX Model 800 systems shipped from IBM before December 1990, have the PF1193 BIOS and Reference Diskette Upgrade installed.

LIMITATIONS:
OS/2 LIMITATIONS The following levels of OS/2 require special consideration on the 7568-C40, with respect to the Control-Alt-Delete keyboard entry:
o OS/2 Standard Edition, Versions 1.2 and 1.3
o OS/2 Extended Edition, Versions 1.2 and 1.3.

Use of Versions 1.2 and 1.3 of these products will result in a "system hang" problem if Control-Alt-Delete (C-A-D) is entered through the keyboard. C-A-D should not normally be used with the GEARBOX Model 800. The key switch "Reset" position is provided for this purpose. If C-A-D is entered, the system will have to be powered down and restarted, or the key switch can be used to reset the system.

Machine Type 7568 -- Installation and Operation
Model C40 Guide, Three Port Cable (with ordered Assembly, RFI Filter Kit,
No DASD Content 6551 N/C

One of the following IBM installed DASD content alternatives may be ordered with the system order, at the listed additional charge:
120MB SCSI Fixed Disk Drive (3) 6546 $ 3,500
320MB SCSI Fixed Disk Drive (3) 6547 5,500

The following are available for customer installation on the GEARBOX Model 800:
80486 Processor Card Upgrade Kit 6543 $ 3,500
7568 Attachment Support for PS/2 Rewritable Optical Drive PF1199 N/C

GEARBOX MODEL 800 (7568-040/150)
o Micro Channel (TM) Architecture with a 16/32 Bit Bus
o Intel 80386DX-25 Processor with 32KB of Cache Memory
o 4MB or 8MB Base Memory Standard (Model Dependent), Expandable to 8MB on the Processor Card (All Error Correcting Code Memory)
o 120MB SCSI Drive, with 0.5MB of DASD Cache Memory on the Disk/Diskette Adapter Card (Standard on the Model 150, second 120MB Disk Drive optional)
o Supported by IBM PC DOS (Version 3.30/4.0) and OS/2 (R) (Standard Edition (SE) Version 1.1/1.2 and Extended Edition (EE) Version 1.1/1.2)
o Battery Backup with Orderly Shutdown Capability
o 300 Watt Power Supply with DC Voltage Start-Up/Operation Capability
o Integrated VGA Graphics, Serial/Parallel Ports and Keylock

BASE SYSTEM
The GEARBOX Model 800 supports the PLANT FLOOR SERIES (TM) Distributed Automation Edition (TM) products and related application programs.
   Integration of many functions on the standard system cards leaves a higher number of slots available for customer use (up to seven on the Model 040).

The GEARBOX Model 800 is based on an Intel 80386 microprocessor, operating at 25 MHz, and supports an optional 80387 Math Co-Processor. The base memory is 8MB on the Model 150, or 4MB (expandable to 8MB) on the Model 040. In addition, the Model 800 will support the 0-16MB Extended Memory Adapter (#6345). All memory is Error Correcting Code (ECC). Performance is further enhanced through 32KB of Cache Memory on the Processor Card, a 120MB SCSI Disk Drive with 23ms access time, and 0.5MB of DASD Cache Memory on the Disk/Diskette Adapter Card. A second 120MB Disk Drive is an optional feature.

The Disk/Diskette Adapter Card also contains an external SCSI interface for customer use. Use of this interface requires that the customer provide a software device driver for interface to the intended operating system. No such software device driver file is provided with the system.

The GEARBOX Model 800 is supported by IBM PC DOS (Version 3.30/4.0) and OS/2 (SE Version 1.1/1.2 and EE Version 1.1/1.2) operating systems.

Language extensions for PC DOS and OS/2 will be available in March of 1990, to take full advantage of the unique error notification and orderly shut-down/start-up capabilities of the system.

Five IBM personal computer software languages are supported:
o BASIC Compiler/2 (TM)
o C/2 (TM)
o FORTRAN/2 (TM)
o Macro Assembler/2 (TM)
o Pascal Compiler/2 (TM)

-300 total watt worldwide, autoranging power supply, with two fans to assure system cooling.
-External Voltage Modules (EVM)  Provide DC voltage start-up and operation with operation at 24, 48, or 60V supported. The selected EVM also provides the means for external battery backup to assure continuity of system operation in the event of main power loss
- An available internal battery will assure continuity of operation through brief main power disturbances, and also provide for an orderly shutdown period if main power is lost and no external battery backup is in place.

NOTE: Either the internal battery or an EVM (with connected external DC voltage source) must be ordered and installed to retain system set up information during periods when the system is shutdown.

A Three Port Cable Assembly is included for connection from the System Resource Card in the system to various other standard connectors (serial parallel). The standard system can be panel mounted. Rack mounting is also available.

Two configurations of the GEARBOX Model 800 are available. The configurations and brief content summary are as follows.

MACHINE TYPE 7568 MODEL 040
o Frame and Backplane
o Power Supply (300 Watts), autoranging, with function indicators
o Processor Card with 4MB of ECC memory (expandable to 8MB using 2MB Memory Expansion Kit, #5213), 32KB of Cache Memory, and 80387 Math Co-Processor socket
o System Resource Card w/integrated VGA, serial/parallel, CMOS memory, and real time clock
o Keyboard and cable
o Card Shrouds with indicator windows (empty in seven slots)
o Installation and Operation Guide with Diagnostic Diskette.

NOTE: Initial set-up and loading of diagnostic software on the Model 040 requires the use of the Set-Up and Service Device (#6230).

MACHINE TYPE 7568 MODEL 150
o Frame and Backplane
o Power Supply (300 Watts), autoranging, with function indicators
o Processor Card w/ 8MB ECC memory, 32KB Cache and 80387 Math Co-Processor socket
o System Resource Card w/integrated VGA, serial and parallel, CMOS memory, and RTC
o Keyboard and cable
o Disk Module (Disk/Diskette Adapter Card, with 0.5MB DASD Cache Memory and Shroud)
o 120MB SCSI Disk Drive (a second 120MB Drive feature is available)
o 1.44MB Diskette Drive (3.5-inch)
o Card Shrouds with indicator windows (empty in 5 slots)
o Installation and Operation Guide with Diagnostic Diskette.

OPERATING SYSTEM STATEMENT OF DIRECTION: IBM intends to provide a future Advanced Interactive Executive PS/2 (AIX (TM) PS/2) operating system enhancement that will support the GEARBOX Model 800.

The GEARBOX Model 800 supports the following previously announced features. All these feature cards require one of the Micro Channel adapter features (#6224 or #6225) for installation, except the 0-16MB Extended Memory Adapter (#6245).

BATTERY, NICAD (INTERNAL) (#6221): This internally mounted battery allows continuous operation through brief main power interruptions (nominal 1.5 seconds default). Also, if the interruption continues beyond this period, the battery maintains DC voltages to allow the system to perform an orderly shutdown.

NOTE 1: Either this battery or an EVM (#6231 or #6528) must be ordered and installed to retain system set up information during periods when the system is shut down.

NOTE 2: Under hardware control the time for shutdown is limited to a maximum of 10 seconds. Control of shutdown may be conveyed to software, but even then, depending on the load on the power supply, the battery capacity, and thus the time for shutdown, may be limited to a 10 second period. If this is not adequate for the operating system and applications running on the system, the customer should provide external battery backup, which requires an External Voltage Module (#6231 or #6528).

DISK MODULE (#6222): The Disk Module allows for adding DASD to a Model 040. The Disk Module consists of a double-wide shroud and a Disk/Diskette Adapter Card, to be plugged into the Model 040 frame in place of two empty card shrouds. The Disk/Diskette Adapter Card contains 0.5MB of DASD Cache Memory, and supports up to two 120MB Disk Drives and a 1.44MB Diskette Drive installed inside the shroud.

The Disk/Diskette Adapter Card also contains an external SCSI interface for customer use. Use of this interface requires that the customer provide a software device driver for interface to the intended operating system. No such software device driver is provided with the system or feature.

120MB DISK DRIVE (#6223): The 120MB Disk Drive is the same as the drive that comes standard on the Model 150. The 120MB Disk Drive can be used along with the Disk Module to provide a disk drive on the Model 040, or can be added to the Model 150 to provide a total of 240MB of Disk Drive capacity.

16 BIT MCA ADAPTER (#6224): The 16 Bit Micro Channel Adapter allows the plugging of selected 16 bit Micro Channel cards with a PS/2 form factor into the GEARBOX Model 800 Backplane. The Display Adapter 8514/A (#4054) must use the 16 Bit Micro Channel Video Adapter (#6225) for installation in the GEARBOX Model 800.

NOTE:
o Refer to the list of PS/2 and other adapters that are supported on this system. The 16 bit Micro Channel Adapter must be used to install any supported feature card in the Model 800, except for those that are in the GEARBOX form factor.
o PS/2 adapters should not be installed in the slot #9 position. This is due to limitations with setup and diagnostic code recognizing such adapters in that position.

16 BIT MCA VIDEO ADAPTER (#6225): This 16 Bit Micro Channel Video adapter is required for installing the Display Adapter 8514/A (#4054) in the system.

NOTE: PS/2 adapters should not be installed in the slot #9 position. This is due to limitations with setup and diagnostic code recognizing such adapters in that position.

1.44MB DISKETTE DRIVE (SLIM-LINE) (#6229): The 1.44MB Diskette Drive is the same as that which comes installed on the Model 150. The 1.44MB Diskette Drive can be used along with the Disk Module (#6222) to provide diskette function on a Model 040. The Model 150 is limited to one diskette drive and cannot accept the 1.44MB Diskette Drive in addition to the already installed device.

SETUP AND SERVICE DEVICE (#6230): The Setup and Service Device is a stand-alone 1.44MB, 3.5-inch diskette drive and cable in an enclosure, which must be used during initial system set-up and to load diagnostics and record test results on a Model 040 (no DASD model). The cable plugs into a port on the System Resource Card.

EXTERNAL VOLTAGE MODULES (#6231 AND #6528): These EVM features allow the connection of an external DC voltage source either for additional battery backup to the main AC power, or as a main DC power source. EVM #6231 must be used when the external source is 24 volts. EVM #6528 must be used when the external source is 48 or 60 volts. No other external voltages are to be used as a main source or as a backup.

NOTE: Either one of these EVMs (with a connected external DC voltage source), or the internal nicad battery (#6221) must be ordered and installed to retain system set up information during periods when the system is shut down.

CARD SHROUD (MACHINE TYPE 7568) (#6530): This Card Shroud is the same as those that come standard on the system. The Card Shroud permits installation of adapter cards in extra shrouds for immediate insertion in a GEARBOX Model 800 system, without having to open an installed shroud/card assembly for replacement of the card in the shroud. The Card Shroud could also be used to fill the open positions if the Disk Module were to be removed from a Model 150 system (two Card Shrouds would be needed).

NOTE: The Card Shroud (#6530) is not compatible with the IBM 7552 Industrial Computer Processor and System Resource cards, due to different locations of openings in the shroud for LED indicators.

80387 MATH CO-PROCESSOR (25 MHZ) (INDUSTRIAL) (#6532):  This option is installed in the Math Co-Processor socket on the Processor Card, and does not require an expansion slot. The 80387 Math Co-Processor (Industrial) has been modified to meet the environmental requirements of the GEARBOX system.

Power Supply Values
Max output 288.8 W
+5V @42A
+12V @4A
-12V @1A
-5V @0.3A
+6V @5mA
Battery Charger +28V @80mA
Fan Supply 15W max

Battery
IBM Replacement part P/N 15F8625

9595 Main Page 

extensions for PC DOS and OS/2 will be available in March of 1990, to take full advantage of the unique error notification and orderly shut-down/start-up capabilities of the system.

Five IBM personal computer software languages are supported:
o BASIC Compiler/2 (TM)
o C/2 (TM)
o FORTRAN/2 (TM)
o Macro Assembler/2 (TM)
o Pascal Compiler/2 (TM)

Two configurations of the GEARBOX Model 800 are available. The configurations and brief content summary are as follows.

MACHINE TYPE 7568 MODEL 040
o Frame and Backplane
o Power Supply (300 Watts), autoranging, with function indicators
o Processor Card with 4MB of ECC memory (expandable to 8MB using 2MB Memory Expansion Kit, #5213), 32KB of Cache Memory, and 80387 Math Co-Processor socket
o System Resource Card w/integrated VGA, serial/parallel, CMOS memory, and real time clock
o Keyboard and cable
o Card Shrouds with indicator windows (empty in seven slots)
o Installation and Operation Guide with Diagnostic Diskette.

NOTE: Initial set-up and loading of diagnostic software on the Model 040 requires the use of the Set-Up and Service Device (#6230).

MACHINE TYPE 7568 MODEL 150
o Frame and Backplane
o Power Supply (300 Watts), autoranging, with function indicators
o Processor Card w/ 8MB ECC memory, 32KB Cache and 80387 Math Co-Processor socket
o System Resource Card w/integrated VGA, serial and parallel, CMOS memory, and RTC
o Keyboard and cable
o Disk Module (Disk/Diskette Adapter Card, with 0.5MB DASD Cache Memory and Shroud)
o 120MB SCSI Disk Drive (a second 120MB Drive feature is available)
o 1.44MB Diskette Drive (3.5-inch)
o Card Shrouds with indicator windows (empty in 5 slots)
o Installation and Operation Guide with Diagnostic Diskette.

OPERATING SYSTEM STATEMENT OF DIRECTION: IBM intends to provide a future Advanced Interactive Executive PS/2 (AIX (TM) PS/2) operating system enhancement that will support the GEARBOX Model 800.

The GEARBOX Model 800 supports the following previously announced features. All these feature cards require one of the Micro Channel adapter features (#6224 or #6225) for installation, except the 0-16MB Extended Memory Adapter (#6245).

DISK MODULE (#6222): The Disk Module allows for adding DASD to a Model 040. The Disk Module consists of a double-wide shroud and a Disk/Diskette Adapter Card, to be plugged into the Model 040 frame in place of two empty card shrouds. The Disk/Diskette Adapter Card contains 0.5MB of DASD Cache Memory, and supports up to two 120MB Disk Drives and a 1.44MB Diskette Drive installed inside the shroud.

The Disk/Diskette Adapter Card also contains an external SCSI interface for customer use. Use of this interface requires that the customer provide a software device driver for interface to the intended operating system. No such software device driver is provided with the system or feature.

120MB DISK DRIVE (#6223): The 120MB Disk Drive is the same as the drive that comes standard on the Model 150. The 120MB Disk Drive can be used along with the Disk Module to provide a disk drive on the Model 040, or can be added to the Model 150 to provide a total of 240MB of Disk Drive capacity.

1.44MB DISKETTE DRIVE (SLIM-LINE) (#6229): The 1.44MB Diskette Drive is the same as that which comes installed on the Model 150. The 1.44MB Diskette Drive can be used along with the Disk Module (#6222) to provide diskette function on a Model 040. The Model 150 is limited to one diskette drive and cannot accept the 1.44MB Diskette Drive in addition to the already installed device.

CARD SHROUD (MACHINE TYPE 7568) (#6530): This Card Shroud is the same as those that come standard on the system. The Card Shroud permits installation of adapter cards in extra shrouds for immediate insertion in a GEARBOX Model 800 system, without having to open an installed shroud/card assembly for replacement of the card in the shroud. The Card Shroud could also be used to fill the open positions if the Disk Module were to be removed from a Model 150 system (two Card Shrouds would be needed).

NOTE: The Card Shroud (#6530) is not compatible with the IBM 7552 Industrial Computer Processor and System Resource cards, due to different locations of openings in the shroud for LED indicators.

The GEARBOX Model 800 supports the following IBM machine types:
o   7544 Industrial Graphics Display
o   7554 Industrial Graphics Display
o   7525 Data Collection Terminal (PC DOS operating system only)
o   7527 Data Collection Terminal (PC DOS operating system only).
 
 


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