Modification of a Bung GB Doctor Card 16Mbit to 64Mbit ====================================================== Carefully open the card. It is not easy, because the battery blocks the cap. Try to force a thin piece of plasitc (or your finger nail) between the two pieces of the case. After successfully open it, it is recommended to cut a piece of plastic out of the cap (see picture), opposite to the battery. So that it will open easier the next time. Check if you have the right hardware: big 'V2' sign on the lower right, above that the 16M Flash from Macronix and left of that the Bung ASIC GBX-01. Now remove the 16M Flash, it is replaced with a Intel 28F640J5, 64Mbit device. Do not take another device, because the programming software recognise this type. It is the best to use a special "hot air" SMD remove solder iron. If ou do not have access to one, bend every single pin carefully up (with help of a needle) by heating it. Be careful and do not lift the pads ! The 16M datasheet could be found here: www.macronix.com The Flash datasheet could be found here: http://developer.intel.com/design/flcomp/datashts/290606.htm As far as I know, there is only this Flash out there with this pinning, you can NOT use another ! Beside this, FLASH ID will differ and the progrmming software will not recognise the other device ! DO NOT TAKE THE TSSOP DEVICE, YOU WILL NOT BE ABLE TO SOLDER THE THIN PINS ! This article describes the replacemet of the macronix 29F1610 Flash device with a Intel 28F640J5 Flash device. If there is an other Flash device in the 16M card, the replacement may also work, but you have to figure out the connections yourself. The technique to do the wireing is the same used for the MBC5 card. Connect a 0.2 mm copper wire to every pad and lead them to the upper or lower side for about 3 cm. Refer to picture ?, the datasheets and the table (GB connector points to you, battery and RAM is on the upper side. Macronix use the 16bit way to name the address lines, do not be desturbed that there is always a difference of one (GB A(1) <-> MX A(0)). You have to be very experienced in soldering, because some copper wires have to be fixed to the Bung ASIC pins ! Be attentive to put no solder tin across two pins ! MX Intel Flash Flash wire function connect Pin Pin to for GB to 1 22 down WE# 2 10 down A19 3 11 down A18 4 43 up A8 5 45 up A7 6 46 up A6 7 47 up A5 8 48 up A4 9 49 up A3 10 50 up A2 11 51 up A1 12 1 down CE# 13 7 down GND (CE1 of 28F640) 14 21 down OE# 15 38 up D0 16 not used 17 40 up D1 18 not used 19 33 up D2 20 not used 21 31 up D3 22 not used 23 28 down VCC (VCCQ of 28F640) 24 27 down D4 25 not used 26 25 down D5 27 not used 28 16 down D6 29 not used 30 18 down D7 31 37 up A0 32 44 up GND 33 36 up Byte# 34 12 down A17 35 13 down A16 36 5 down A15 37 4 down A14 38 3 down A13 39 2 down A12 40 54 up A11 41 53 up A10 42 52 up A9 43 9 down A20 44 right VCC (see text) ------------------------------------------------ 7 CE1 GND 34 CE2 GND 56 VPEN VCC, see text 29 GND GND, see text 44 GND GND 14 VCC VCC 6 A22 Bung ASIC pin 49 8 A21 Bung ASIC pin 48 20 STS Bung ASIC pin 5 55 RP# Reset#,Bung ASIC pin 39 or cartridge pin 30 15 not used 17 not used 19 not used 23 not used 24 not used 26 not used 30 not used 32 not used 35 not used 39 not used 41 not used 42 not used ------------------------------------------------ Pin 62 of the Bung GBX-01 should be connected to GND. Cut this connection carefully with a sharp knife. Connect pin 61 with a 0.2 mm copper wire (see above) to GND. Put adhensive textil tape with the size of the MX Flash above the wires, so that the pads are covered from it. Bend all pins of the Flash straight, see picture ? 2.. Take some thicker wire (e.g. from resistor) and solder one to pad 44 pionting to right and another one to pin 16 of the RAM pointing down (refer to picture). These are used as a base to fix the device. Cut them carefully and do not lift the pads. Solder them to pin 56 and 29 of the Flash. Now connect all wires to the appropriate signal. Use a ohm meter to find the right one, keep the lines short. Below the dashed line are additional connestions that have to be made to the Flash. Try to keep the VCC/GND (14, 28, 44) lines as short as possible. Pin 62 of the Bung GBX-01 should be connected to GND. Cut this connection carefully with a sharp knife. Connect pin 61 with a 0.2 mm copper wire (see above) to GND. Check if there are 5 new connestions to the ASIC. Thats it, now our cartridge must look like this one on the picture ......and should work ! Your most preferred Flashprogram should recognise it as a 64M card.