Atomwide 8MB Memory Upgrade Fitting instructions & user guide
Contents
1. Stage Three The MEMC card Looking at the main circuit board from the front of the computer identify the MEMC socket which is to the left of ARM i e nearer the power supply and slightly smaller Examine the lettering printed on the MEMC chip The 8MB Memory Upgrade may be fitted to computers equipped with MEMC1A or VL2304A memory controller chips It is the suffix A which is important If the machine does not contain a suitable MEMC or you are in any doubt then contact Atomwide Limited immediately for assistance Remove the MEMC chip using a 68 pin PLCC extractor tool Place the chip in on a static free receptacle Open the bag containing the MEMC card remove the card and place it on a static free surface Place the MEMC chip you have just removed from the computer in the vacant socket on the MEMC card in the same orientation as its neighbour and push it home using your thumb The MEMC chip should sit flush within the socket Turn over the MEMC card and note the three plugs on the underside The large square plug should be positioned over the MEMC socket on the main circuit board whilst one of the two small white plugs will fit over the fan connector near the power supply Two plugs are provided to cater for the change in position of the fan connector between A440 and A400 1 models The card will only easily fit over one of them Put the MEMC card in place and push the plugs home gently using your thumb Examine the2. and parallel ports It should now be possible to slide the main circuit board the necessary four or five inches out of the rear of the case Front of cornputer a i i tep Backplane connector figure one position of ARM amp MEMC Stage Two ARM3 Upgrades Looking at the main circuit board from the front of the computer identify the large square 84 pin processor socket labelled ARM between the floppy disc bus bar and the backplane connector If the socket contains an ARM or VL86C010 processor chip which sits flush in the socket then skip the rest of this section A small board plugged into the ARM socket indicates an ARM3 Upgrade is present read the rest of this section now The 8MB Memory Upgrade may be fitted to machines equipped with ARM3 Upgrades sold by Aleph One Limited but with NO OTHER ARM3 UPGRADE If the machine is fitted with an Aleph One ARM3 Upgrade then remove it by pulling firmly upwards at the edges of its circuit board noting its orientation as you do so Examine the plug on the bottom of the ARM3 Upgrade if it consists of a roughly cubic solid black plastic core surrounded by gold coloured square posts then IT MUST BE EXCHANGED BEFORE FITTING THE 8MB MEMORY UPGRADE Contact Atomwide Limited immediately about exchanging the ARM3 Upgrade at the address shown at the front of this manual An ARM3 Upgrade whose plug has a hollow core or round posts is compatible with the Atomwide 8MB Memory Upgrade
3. to act as a spacer between the Atomwide 8MB Memory Upgrade and the Aleph One ARM3 Upgrade If an ARM3 Upgrade is fitted insert the insulator between the two cards where they overlap to protect against short circuits Re attach the floppy disc drive bracket to the bus bar using two screws and connect the 34 way data and 4 way power connectors Re connect the three power connectors with long leads to the backplane Yellow 12V Black OV Red 5V Before putting the backplane into its socket ensure that the MEMC card ribbon cable runs BENEATH the backplane Insert the backplane and attach the backplane support bar to the case using two screws Stage Five The RAM card Open the bag containing the RAM card remove the card and place it on an anti static surface Locate the row of ICs labelled IC24 1C27 These are located behind an expansion slot on the backplane labelled Backplane Connector in figure one Remove the ICs from their sockets and insert the them into the corresponding slots on the new RAM card Make sure that you have the card the right way round the ICs should be towards the front of the machine The RAM card can then easily be inserted into the sockets vacated by the ICs Connect the free end of the 34 way cable from the MEMC card to the connector at the edge of the RAM card A polarising stud ensures it may only easily be inserted one way around Stage Six Using the 8MB Memory Upgrade Inse
4. Atomwide 8MB Memory Upgrade Fitting instructions amp user guide IMPORTANT Warranty restrictions This upgrade should only be installed by a Component Level Service Centre approved by Acorn Computer If this instruction is disregarded then the guarantee on either this upgrade or the computer or both may be invalidated If after consideration you do not wish to attempt this upgrade then please contact us to arrange for the upgrade to be installed on your behalf License restrictions The Atomwide 8MB Memory Upgrade is protected under world copyright law reproduction of its artwork is expressly forbidden The software is similarly protected by recent British copyright law amendments and is supplied under licence from Acorn Computer plc Cambridge England it may only be used with the Atomwide 8MB Memory Upgrade Suitability This upgrade is suitable for the following Acorn Archimedes models A440 R140 and all models in the A400 1 series It is not suitable for use with either A3000 or A305 A310 models Please ensure that you are about to upgrade a suitable machine to avoid wasting our time and yours First edition May 1990 C Copyright 1990 Atomwide Limited 23 The Greenway Orpington Kent BRS 2AY Telephone 0689 38852 Designed and manufactured by Atomwide Ltd Documentation by Capricorn Consulting London SE14 Contents of the 8MB Memory Upgrade One copy of these instructions One 3 5 in flopp
5. already noticed that the start up message displayed after CTRL BREAK has been amended to read RISC OS 8192K In future the desktop will only operate if the computer starts up with the 8MB Memory Upgrade floppy disc inserted You might like to copy the Boot file from the floppy disc onto your hard disc by dragging it from within the Desktop Advanced users can amend their boot sequence to cause the replacement modules to be loaded every time To re load your configuration from the disc exit the desktop and enter the following at the Supervisor prompt ADFS lt RETURN gt MOUNT 0 lt RETURN gt CMOSRESET lt RETURN gt and press CTRL BREAK when the floppy disc light goes out 2Q e Lon ber tast pe ae
6. efore switching the machine off you should close all open files and make hard discs safe by entering again at the supervisor prompt SHUTDOWN lt RETURN gt Now switch off the power and disconnect the computer from the mains supply Service documentation You may find it useful to refer to the relevant Service Manual for the computer you are planning to work on Acorn Computer publishes two relevant documents one for the A440 Acorn part no 0476 155 and another for the A400 1 amp R140 models part no 0483 075 Both Service Manuals are available from The Spares Department Acorn Computers Ltd Fulbourn Road Cherry Hinton Cambridge CB 1 4JN Telephone 0223 245200 In particular the sections covering disassembly and assembly contain informative diagrams and step by step instructions Fitting the 8MB Memory Upgrade Stage One Disassembling the computer Double check that you have switched off the computer and disconnected it from the mains supply Unplug the keyboard mouse and all cables from the rear of the computer Place the monitor keyboard and mouse safely out of the way Remove any expansion cards Podules from the computer by following the instructions supplied with them Using a Philips head screwdriver remove the three screws along the top rear of the computer case and the one either side towards the front of the case Put the five screws safely out of the way Slide off the top cove
7. machine from the side and satisfy yourself that the card is properly seated in the sockets before proceeding If in doubt remove the card and try again Slide the main circuit board back into the computer and re fit the two screws which retain the board at the rear On A400 1 models re fit the screws through the board from beneath up to three screws Stage Four Cable origami Re connect the loudspeaker LED and battery connectors to the main circuit board Plug the fan lead onto the new fan connector on the MEMC card Re connect the four power connectors with short leads to the main circuit board They are colour coded and the main circuit board is clearly marked with their names Purple 5V Yellow 12V Black OV Red 5V Push each home firmly onto its post On A400 1 models remove the nut from the earthing post and re connect the earth strap onto the post tightening the nut afterwards If ahard disc was fitted re attach its bracket to the bus bar with two screws Reconnect the 34 way control cable at both ends and thread the 20 way data cable through the hole in the MEMC card cable before re connecting it at both ends Insert the floppy disc drive cable into the main circuit board connector If an ARM3 Upgrade was fitted position it over the ARM socket in the correct orientation with the large cylindrical capacitors over the MEMC socket and push it home firmly A small piece of insulating material is supplied
8. r of the case towards the rear Lift it gently and put it to one side Remove the screws retaining the backplane at each end of its metal support bar Unplug the three power connectors and lift the backplane upwards to detach it from the main circuit board Put the two screws safely out of the way Detach the two leads at the rear of the floppy disc drive from the drive If a hard disc is fitted detach the two ribbon cables and one power cable from the drive Unscrew the two screws holding the hard disc bracket onto the bus bar and remove the drive from the computer Put the two screws safely out of the way Detach the loudspeaker LED battery and fan connectors from the edge of the main circuit board next to the power supply All three connectors should remain captive at the other end Detach the four power connectors from the main circuit board Note their respective position and colour for use during re assembly Remove the two screws which retain the back panel of the main circuit board at the rear of the machine Put the two screws safely out of the way If the computer is an A400 1 model unscrew the nut which retains the earthing strap to the bus bar next the the floppy disc drive and lift off the earth strap Replace the nut on the threaded post so as not to lose it Also remove the two screws which hold the main circuit board to the base of the machine and the screw found on the underside of the case between the serial
9. rt any remaining expansion cards following the instructions supplied with them Check that all wiring is correct and that everything is screwed down before finally sliding the case cover back on and using up the last five screws to re attach it Re attach any cables to the rear of the computer along with the keyboard and mouse at the front Hold down the DELETE key on the keyboard and switch on the mains power keeping DELETE held until the RISC OS desktop appears The computer should report an Address exception at amp xxxxxxxx This indicates that the 8MB Memory Upgrade has successfully been fitted A bug in RISC OS means that new software must be loaded from disc before the new memory can be used Sones cn aura e A choo Le rolade fast Tat a w Va WeQde a peed Pak Salem sA hwe uN E ich de LA al Insert the 8MB Memory Upgrade floppy disc exit the desktop and enter the following at the supervisor prompt ADFS lt RETURN gt MOUNT 0 lt RETURN gt SETUP lt RETURN gt Once the program has completed and the floppy disc light is extinguished hold down CTRL and press BREAK keeping CTRL held down until after releasing BREAK The computer should boot from the floppy disc and enter the desktop at which point it is ready for use To prove that the 8MB Memory Upgrade is working examine the Task Display window available from the Archimedes menu in the lower right hand corner of the desktop You might also have
10. y disc One black bag marked MEMC card One black bag marked RAM card One small piece of insulating material Check that each of these items is present before proceeding further If any item s is are missing then kindly contact Atomwide Limited immediately You will also require At least one slot head screwdriver At least one Philips head Posidrive screwdriver A 68 pin PLCC extractor tool Aclean flat static free work surface A stable receptacle for screws Thirty minutes free from interruptions Common sense and patience It is particularly important that you have a genuine 68 pin PLCC extractor tool rather than some ersatz substitute Use of other than the appropriate tool can damage both ICs and sockets no warranty claims will be accepted either by Atomwide Limited or Acorn Computer as a result of damage resulting from the use of inappropriate tools Getting ready to fit the 8MB Memory Upgrade Because the contents of CMOS configuration memory will be lost during the installation process it makes sense to save the current configuration a utility is provided for this purpose to use it do the following Insert the 8MB Memory Upgrade floppy into the machine Exit the desktop and enter the following at the supervisor S prompt ADFS lt RETURN gt MOUNT 0 lt RETURN gt CMOSSAVE lt RETURN gt Wait a few moments for the program to finish and the floppy disc light to go out Finally b
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