Memory Plus Expansion Board (250-1011) Installation Faxback Doc. # 2002 If you own a Tandy 1000HD, the Memory PLUS Expansion Board, inside the computer has two rows of 64K each for a total of 128K. The jumper block is over pins labeled E3 and E4. Preliminary Procedures: 1. WARNING: Turn off all equipment. If any unit is on, you can damage thee Central Processing Unit or the board. Wait at least 10 seconds before removing or inserting any board into the computer. 2. To avoid static electricity build-up, which can destroy certain integrated circuits, touch a grounded metal object before handling any circuit board. DO NOT stand on a carpeted floor while installing this board. 3. Remove the 2 screws on the front of the main unit. Remove the cover by sliding it away from the rear of the unit, parallel to the computer. Memory Plus Expansion Board: 1. To install the Expansion Board, rotate the chassis so that the fan faces you. To the immediate right of the fan are 3 option slot covers, each fastened to the rear of the chassis by a sheet metal screw. On the main printed circuit board, directly behind these covers, are 3 thin black edge-connectors. This board should be installed in either the middle of the right-hand edge-connector as you face the rear of the computer. 2. Remove the sheet metal screw from the top of the selected cover. Tilt the metal strip away from you and lift the strip so that the tab on the panel clears the bottom of the slot. Store the cover in a safe place for future replacement. 3. Prior to insertion of the board into the selected edge-connector socket, look at thee rear, right corner of the main printed circuit board as you face the rear of the machine. If you see a small, multi-pronged metal connector, proceed with insertion of the board. If you do not, the short wire that is attached to the lower rear corner of the Expansion Board should be removed, prior to insertion of the Board, as it will not be needed. 4. Discharge any static build-up by touching a grounded metal object. Now grasp the Expansion Board by its upper edges and position it above thee black edge-connector socket. Insert the lower tab on the board's mounting bracket into the slot on the rear of the chassis, in the same way the option slot covers are mounted. At the same time, apply even downward pressure engaging the edge-connector into its socket. Align the entire card so that the U-shaped cutout on the top of the option card panel is positioned over the screw-hole on the rear of the chassis. Replace the screw you removed before and tighten it to secure the board. Do not over tighten the screw. 5. If you have determined that your unit has a metal, multi-pronged connector fastened to the board in the corner, and with the board installed, locate the short wire connected to the Board's lower rear corner. Grasp the short wire attached and slide the terminal of the wire over one of the prongs. 6. Replace the top cover, securing it with the screws previously removed. Adding the Plus Upgrade Board: A PLUS Upgrade Board must be mounted on the Memory PLUS Expansion Board prior to installation of the Expansion Board. In our example we shall use the Mouse Controller/Calendar PLUS Upgrade Board. However, the procedure is essentially the same for other PLUS Upgrade boards. 1. The Expansion Board is supplied with a solid mounting bracket which must be removed and replaced by the special bracket that comes with the Upgrade board. Loosen and remove the two screws. Lift the original mounting brac- ket from the Expansion board and save it for future needs. 2. Position the bracket that is supplied with the Upgrade Board over the bracket mounting holes on the Memory board. Insert and tighten the screws previously removed. Do not over tighten the screws. 3. Place the Memory PLUS Expansion Board on a flat surface with the bracket farthest from you. Position the Mouse Controller/Calendar PLUS Upgrade Board so that the metal cable connector socket fits into the corresponding cut-out in the new mounting bracket. 4. While holding the Upgrade Board at a slight angle to the Expansion Board, CAREFULLY ALIGN the black edge connector socket of the Upgrade Board over the row of pins that protrude from the right side of the Expansion Board toward the bracket. 5. SLOWLY lower the Upgrade Board onto the pins, maintaining the alignment and while keeping the cable connector socket inserted in the bracket. When the Upgrade Board is fully seated and parallel to the Expansion Board check to see that all pins are fully inserted into the socket. If, while seating the Upgrade Board, any resistance is encountered, STOP. Do not force the board. A pin may be bent which could result in the need for ser- vice to rectify the situation. 6. There are three white, snap in stand-offs that help support the Upgrade Board. Apply even, firm pressure to the appropriate place on the surface of the Upgrade Board until tip of each stand off enters the corresponding hole on the Expansion Board, and snaps into place. 7. Turn the combination board so that the cable socket faces you. Insert and tighten the two sheet metal screws into the hole in the socket flange, securing the socket to the mounting bracket. 8. This completes the Upgrade Board installation. Now you can install the combination board into your Tandy 1000. Check Out: 1. With the Memory PLUS Expansion board in place and the cover installed, power up the machine and monitor. you need not have a disk in your drive. 2. The first message that will appear on your screen designates the available memory. For example, if you did not add more memory to the Memory PLUS Expansion board but installed it with one row of 256K, that level combined with the built-in RAM of 128K would give you a total of 384K. The message when you power up reads: Memory Size = 384K If you see any other message, such as MEMORY FAULT ERROR, turn the unit off and wait at least 10 seconds before re-opening the machine. Then, open the cover and be certain that the memory board has been properly seated. It would also be wise to check you jumper configuration once more. If after making this check, re-closing the unit and powering up once more you should get the same error message, contact your Radio Shack for additional assistance. Addition of Memory: Tandy 1000 An additional 256K of RAM (Upgrade Kit AXX-7142) may be added to the Memory PLUS Expansion Board to bring it to 512K. the kit consists of 8 integrated chips. Lay the board so the mounting bracket is to your right. They are to be installed in the 8 sockets on the extreme left edge of the board. 1. WARNING: Turn off all equipment. If any unit is on, you can damage the central processing unit or the board. Wait at least 10 seconds before removing or inserting any board into the computer. 2. To avoid static electricity build-up, which can destroy certain integrated circuits, touch a grounded metal object before handling any circuit board. DO NOT stand on a carpeted floor while installing the memory chips. 3. Examine the chips and verify that their pins are not bent. If any are bent or misaligned, apply only as much pressure as is required to straighten it. Be sure that prior to insertion that the pins are in alignment with each of the contacts in the sockets. 4. Place an IC over an empty socket. Orient the body of the chip so that the small U-shaped cutout molded into one edge faces to your left. Gently ap- ply an even downwards pressure on the chip until it is fully seated in its socket. Be sure that all the pins are totally engaged and that none are bent or overlapping the edge of the socket. Repeat this for all 8 chips. 5. Refer to the Jumper Configuration Information and remove the jumper as indicated. Tandy 1000 HD The Memory PLUS Expansion Board is mounted within the Tandy 1000HD as received. To add additional memory: 1. Remove the cover of the computer following the cautions and procedures under installation. 2. Locate the Expansion Board in the option card slot. Note that in addition to being secured by its mounting bracket, it also fixed by a small brac- ket, in the lower rear corner, that is connected to the main circuit board. Loosen and remove the single screw that attaches the Expansion Board to the bracket. 3. Loosen and remove the option slot cover screw. 4. Grasp the board and lift it from the edge-connector socket. 5. Lay the board on your work surface so the option slot mounting bracket is on your right. To upgrade the board from 128K to 256K, remove and discard the two rows of chips on the left side of the board. Instead, install a 256K upgrade kit into the right-most row of sockets following the pro- cedure above. 6. In this case remove the jumper from E3 and E4 and place it over pins E1 and E2. 7. To upgrade from 128K to 512K, remove and discard the original ICs and install a 256K upgrade kit in each row of sockets. Remove the jumper from E3 and E4. Do not placed it over any pins. 8. Re-insert the board and replace the cover. Check out the memory level. (CSS/jlc-03/27/94)