THE ACCELERATOR 286 - minus zero degrees
Contents
1. both the upper and the lower switches should be set in the up position More information about the functions of these switches is provided in the section enti tled Switches For installing the Accelerator 286 put both switches in the up position now see the diagram Acce lcrator 286 Layout limes eternal tts a E A a a Saa a ma e o SETTING THE PC XT SELECTOR JUMPER For PC For XT Installation Installation PC PC J7 jd J XT XT INSERTING THE ACCELERATOR 286 The ribbon cable should arrive from the factory connected to the cable connector of your Accelerator 286 If it is not connected it should be connected to the 40 pin cable con nector on the Accelerator 286 so that there is not a twist in the cable after the other end is installed in the 8088 socket Insert the other end of Accelerator 286 ribbon cable connec tor into the empty 8088 socket Make sure that the pins match up exactly to the holes in the socket which the 8088 came from Do not twist the ribbon cable and do not insert rea ie into the 8087 socket You now install the the Accelerator 286 ard by tinine pro tae card with the Accecierator 286 s mounting Packet toad Che rear of the system unit as shown in the djagram Inserting the Accelerator 286 Using two hands grasp each end of the card and using even pressure push the card s gold finger connectors straight down into the expansion slot Be sure that you have inserted2. 80287 is installed the jumper can be in any position J4 For manufacturing test purposes only J5 For 80287 operation Must be installed to run the 80287 at 5 MHz Must be off to run the 80287 at 8 MHz If no 80287 is installed the jumper can be in any position J6 For manufacturing test purposes only J7 For IBM PC or PC compatible must be set in the up position For IBM PC XT or XT compatible must be set tn the down position J8 For manufacturing test purposes only 16 TECHNICAL SPECIFICATIONS Microprocessor 80286 8 running at 8 MHI 80287 Math Coprocessor Compatibility Accommodates optional 5 MHz 80287 3 running at 5 MHz or 8 MHz 80287 or 80287 8 running at 8 MHz 8088 Switchable For compatibility with timing dependent programs Access Methods Accesses system memory and performs system I O operations by 8088 emulation through a ribbon cable to the 8088 socket on the main circuit board Cache 8K bytes of 7cro wait state memory on the board Cache Disable Switch For low level have disk formatting memory diagnostic test ing and full compatibility with all copy protection and expanded memory oe y DMA Compatibility Fully DMA compatible Dimensions 5 inches x 9 inches _18
3. Accelerator 286 In addition if you have never in stalled option cards in your computer refer to your com puter s manual before proceeding ABOUT CACHE MEMORY Cache memory consists of 8K bytes of random access me mory RAM on the Accelerator 286 s 16 bit bus This me mory allows the Accelerator 286 to utilize the full potential of its 80286 microprocessor Unlike the 8088 which is in stalled on an 8 bit bus and can access only one byte of me mory at one time the 80286 is a true 16 bit microprocessor installed on a 16 bit bus This cache memory provides the 80286 with memory for program instructions and data that it can access at high speed with zero wait states one word two bytes ata time To insure full compatibility with a wide range of machines and system BlOSes the Accelerator 286 cache memory IS automatically disabled during the machine s self test For the first two minutes after re booting or switching to the 80286 using the toggle switch you will not see a marked Increase from the PC s normal speed After this initial 2 minutes high speed caching will begin ee e a M e ap vas M po INSTALLATION Your Accelerator 286 is very easy to install AIl you need is the card itself with attached ribbon cable an IC chip puller and a sorewdriver Important Do not remove the ribbon cable from the Acce lerator 286 If for any reason you do remove the cable first mark the Pin 1 end of the cable connector t
4. THE ACCELERATOR 286 User s Manual THE ACCELERATOR 286 The Accelerator 286 is an internal option card designed to significantly enhance the performance of your IBM PC PC XT or compatible computer The Accelerator 286 de livers faster performance than an IBM AT in computation intensive operations at a very reasonable cost The Accelerator 286 replaces your computer s 8088 micro processor with an 80286 16 bit microprocessor the same microprocessor used in the IBM AT and AT compatibles The 80286 processor runs at a full 8 megahertz MHz as compared to the 8088 s clock speed of 4 77 MHz The Accelerator 286 also includes 8 kilobytes K of cache me mory Software applications can run up to seven times faster with the Accelerator 286 The Accelerator 286 is not known to be incompatible with any software or any IBM PC XT or compatible system Your Accelerator 286 has several important features which ensure high performance and full compatibility 80286 microprocessor Fast clock speed of a full 8 MHz 8K bytes of high speed zero wait state cache memory Support for 80287 running at 5 or 8 MHz Hardware switchable 8088 remains in system for full com patibility Automatic cache disable during self test for compatibility with most BIOSes Hardware switchable cache disable os ee These features and more are explained in this manual You should read the entire manual before you begin to install your
5. ing To return to the high speed 80286 mode there is no need to turn off the power just toggle the switch up and your Accelerator 286 will automatically reboot to the 80286 and run at a full 8MHz IMPORTANT NOTE Whenever toggling between the 8088 and 80286 microprocessors you must first save all data as the switch between microprocessors will reboot the com puter and all unsaved data will be lost Cache Disable Switch With cache enabled SW2 Up the Accelerator 286 runs programs in its cache memory for highest performance There are however some situations in which you would not want the high speed cache to operate In 7 ae stata order to ensure compatibility For example while the Accelerator 286 is fully compatible with Lotus Intel Micro soft LIM Extended Memory Specification EMS for accessing more than 640K of memory some nonstandard extended memory systems may conflict with the cache memory Similarly some low level hard disk formatting which is usually performed by the manufacturer before shipment and some older floppy disk based copy protection schemes do not permit caching In addition if you run a diagnostic program to check your system s memory you Should disable cache memory to give the diagnostic program direct access to the system s main memory In these situa tions you can disable cache by using the toggle switch which is the lower switch on the outside rear of your PC after insta
6. installing the 8088 match the dot or notch on one end of the 8088 with the notch on the left side of the socket of the Accelerator 286 assuming you are looking at the Accelerator 286 as shown in diagram Ac celerator 286 Layout The 8088 must be pointed in the correct direction or you could destroy the 8088 processor sand damage your Accelerator 286 Make sure all of the pins are lined up with their corresponding holes in the socket and press down gently but firmly using a slight rocking motion being careful not to bend any pins If any pins are bent remove the 8088 and gently straighten them because the pins can only be flexed a few times before breaking CONFIGURING THE ACCELERATOR 286 CARD Next set jumper J7 located at the lower left hand side of the card in the up position if your computer isan IBM PC or PC compatible or in the down position if your computer is an IBM XT or XT compatible see the diagram Setting p ACCELERATOR 286 LAYOUT SHHZ ERR NMI 4 Ji AAN r Cable Connector fod E EE 4 o Ss i a ee ue T ee Down il OE Si the PC XT Selector Jumper This jumper consists of 3 pins and 1 jumper clip For insturctions on setting these jumpers see the section entitled Jumper Settings There are 2 switches located on the back plate of your Accelerator 286 These switches are used to ensure full com patibility with all software and system BlOSes For full Turbo operation
7. llation The cache disable switch can be used to turn cache on or off while operating without rebooting or having to save your data Please note that it takes approximately 2 minutes after you have toggled the switch up for cache to turn on JUMPER SETTINGS To set a jumper refers to the pins that are inserted into and covered by the plastic jumper clip For example to set a 2 pin jumper eg J2 the jumper clip should connect the two pins For a 3 pin jumper eg J1 setting a jumper to the left means that you cover the left 2 pins and leave the right most pin exposed and setting a jumper to the right means that you cover the right 2 pins and leave the leftmost pin exposed To turn a jumper off is to cover only one pin of the 2 or 3 pins in the jumper group and leave the other pins exposed This has the same effect as completely removing the jumper clip but prevents losing the clip in case it is ever needed in the future J1 For 80287 operation set jumper to the left for ERR Numeric Processor Error and to the right for NMI Non Maskable Interrupt If no 80287 is installed the jumper can be in any position J2 For 80287 operation Must be installed to run the 80287 at 8 MHz Must be off to run the 80287 at 5 MHz If no 80287 is installed the jumper can be in any position J3 For 80287 operation Must be installed to run the 80287 at 5 MHz Must be off to run the 80287 at 8 MHz If no
8. mall circle on the back of the chip When you insert the 80287 chip into the socket place Pin 1 at he lower left corner The small notch at the Pin 1 end of the chip corre sponds to a notch at the left side of the socket Use these identifying marks to make sure you insert the chip correctly Carefully align all of the chip s pins with the socket holes and then press the chip gently into place using a slight rocking motion if necessary Be extremely careful not to I bend any of the pins as this could damage or destroy your 80287 See the section entitled Reinstalling the 8088 for more detailed instructions on physically installing the 80287 Your Accelerator 286 can run with either a 5 or 8 MHz 80287 math coprocessor You must set the 80287 jumper to correspond to the speed of the coprocessor you are using A 5 MHz 86287 is usually marked 80287 or 80287 3 and an 8 MHz 80287 is usually marked 80287 8 For instructions on how to set a Jumper refer to the section entitled Jumpers Settings For 5 MHz 80287 For 8 MHz 80287 Set J2 OFF Set J2 ON Set J3 ON Set J3 OFF Set JS ON Set JS OFF SETTING THE 80287 SPEED JUMPERS For 5 Mhz Operation For 8 MHz Operation J4 le ee 5MHz get The Accelerator 286 is compatible with all 3 commonly used numeric processor error handling system Non Maskable Interrupts NMI Numeric Processor Error ERR and sof tware handling of errors A numeric processor erro
9. o ensure that you insert the cable connector correctly when you re install the cable INITIAL STEPS Turn the computer off and disconnect the power cord first from the wall outlet and then from the back of your com puter Remove the cover from the top of your system The cover of the IBM PC and IBM PC XT is secured by five screws in the back of the system see the diagram Removing the Cover Some compatibles have different screw confi gurations or flip top covers refer to the owners manual for your machine Remove and retain the screws as they will be needed to close the back of the set after installation Once the screws are removed carefully slide the cover toward the front of the system to remove it The Accelerator 286 should go into the full length expansion slot closest to the 8088 socket on the motherboard The connector ribbon cable length will govern which expansion slot can be used Remove the retaining screw ard dummy metal adaptor bracket from the back of the computer for the a ee Remove Screws F se REMOVING THE COVER appropriate expansion slot see the diagram Removing the Adaptor Bracket Be sure to save the screw as it will be needed ta fasten the Accelerator 286 Remove the 8088 from your computer s motherboard and set it aside to be reinstalled on the Accelerator 286 card Use an IC extractor or small screwdriver to pry first one end and then the other end of the 8088 chip l
10. oose Do not pry the 8088 up at too much of an angle and take care not to bend any pins Remove the 8087 if it is installed in your motherboard The 8087 if present is normally located immediately to the right of the 8088 chip that you removed If you have a 8087 you zga must remove it whether or not you intend to install a 80287 math coprocessor on the Accelerator 286 Use the IC extrac tor to remove the 8087 following the same steps as removing the 8088 If you will be using an 80287 math coprocessor chip read the section entitled Using The 80287 with Your Accelerator 286 following these installation instructions Otherwise continue to the next section a Retaining i Screw S op Adapitior Brackg REMOVING THE ADAPTOR BRAG Mi o REINSTALLING THE 8088 Your Accelerator 286 offers the unique and valuable feature of allowing you to keep the 8088 on the Accelerator 286 board for full compatibility with speed dependent pro grams which cannot run at the high speed of your Accelera tor 286 To run these programs toggle the upper switch down for PC speed 8088 mode For more information about the use of the 8088 switch see the section entitled Switches The 8088 should be installed into the socket la beled U8 on your Accelerator 286 The 8088 socket is lo cated one row below the 40 pin ribbon cable just below and to the left of the top switch see the diagram Accelera tor 286 Layout When
11. r is caused by illegal activities such as dividing by zero Most software for the AT uses NMI You should initially set J 1 to the right for NMI If this creates Parity Error or Parity Check messages to appear on your screen when using the 80287 switch the jumper to the left for ERR If you con tinue to have problems such as phantom characters appears on the screen while using the 80287 set J 1 off SETTING THE 80287 NUMERIC PROCESSOR ERROR HANDLING JUMPER ERR NMI Setting bor NMI J1 ERR NMI Setting For ERR J ERR NMI Jumper Set Off se i J1 Ei a SWITCHES 80286 8088 Switch In Turbo mode the Accelerator 286 runs with the 80286 microprocessor operating at a full 8 MHz However there are a few application software pro grams that are speed dependent and will not work with the microprocessor running at 8 MHz These software packages cannot run at the 8 MHz high speed of the 80286 in your Accelerator 286 These programs cannot run on the IBM PC AT or Al compatibles for the same reason To insure full compatibility with all application software your Acce lerator 286 has a toggle switch located in the back plate attached to the card It is the upper switch and is located on the outside rear of your PC after installation To run these speed dependent programs turn off the power toggle the switch down turn on the power and your PC will reboot in the slow speed mode 4 77 MHz with the 8088 operat
12. the card completely and securely Into the slot Then secure the mounting bracket with the screw from the dummy bracket Make sure that the air flow through the computer is unrestricted to permit proper cool ing of the Accelerator 286 Replace the system unit cover and reconnect the power cord pw Retaining Screw Cable Connector 30 Ue 4 Rear Panel Ribbon Cable 80287 A soke fp Af pow Socket f Expansion 8088 Socket f Boacd Connector INSERTING THE ACCELERATOR 286 OPERATION The Accelerator 286 is now installed and you are ready to run your IBM PC PC XT or compatible computer at AT speeds Turn on your computer and run any program to verify that your Accelerator 286 is functioning correctly If you have installed an 80287 run any program that uses it to verify that the 80287 is also running correctly If you have any problems see the section entitled Trouble Shooting in this manual The Accelerator 286 does not need software or special proce dures to operate With the Accelerator 286 installed your system will work just the way it did before only faster USING THE 80287 WITH YOUR ACCELERATOR 286 The 80287 is a math coprocessor that speeds up many floating point operations The following steps will enable you to install an 80287 math coprocessor on your Accelera tor 286 Insert the 80287 into the socket provided for it U10 on your Accelerator 286 Pin 1 of the 80287 is identified by a s
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