MuP-VT User Manual
Contents
1. as due to the closeness of these headers I C socket if they are not soldered inthe order recommend you will find it difficult to do without risking damage to the headers The suggested order is as follows J 4 Male Top of the board J 3 Female Bottom of the board U1 1 C 28pin IC socket J 9 Male Top of the board 8 Female Bottom of the board 11 Male Top of the board J 5 Female Bottom of the board J1 J2 amp J13 RCA Socket incorrectly labelled as J 12 on overlay Finally the larger connectors can be fitted Take care that any metalwork casing of the connectors do not touch any of the other components Whilst the connectors used are typical of most of the ones out there there are some variations bet ween manufacturers You are now ready to fit MuP VT to MuP find this is easiest by aligning the female header J 5 with the MuP s male header J 3 and then pressing the two boards together making sure that the other two female headers 3 amp J 8 mate correctly with MuP male headers J 3 amp J 4 Bill of Materials e po e a7 fav a A pomeo J8 14 Pin Female Header Mounted on Underside RCA Socket example NOTE There are many different sizes and pin outs styles for the VGA and RCA sockets the items mentioned above will work chose styles that are the same as those Element14 Farnell parts listed above Schematic Reset APower PGED3 AGND CON DSUB 15 VGA NOTE 100nF2. toa n Eory it was a good idea but mucked it up and inadvertently connected 5V 0 3v3 if the header J 6 was installed amp Luckily the fix is fairly easy Step 1 I will do this before I ship out any boards Using a drill fitted with a 4mm 3 16 drill bit carefully drill out just the top pad fromthe right hand side of J 6 as shown below Drill away the top Right hand pad of J6 As shown Step 2 Solder ashort link between the bottom pad of C2 and the top pad of R4 this is best done on the bottom layer of the PCB and probably easiest if the top leg of R4 Is trimmed leaving a short 3mm length that can be bent over and soldered to C2 The pads to be connected are shown in this picture of the underside of the board Solder link these two pads together on the underside of the PCB TIP leave a little of the leg of R4 to bend over and solder to C2 Vi OV CH ic QO There is no need to install J 6 as it will in effect do nothing The reason have drilled away the pad is if at a later date someone installs the J 6 link no damage will be done to either Mup VT or MuP If at a later date do another run of MuP VT will of course reinstate J 6 with a corrected track layout Construction MuP VT looks easy to build and apart fromthe sole surface mount component J 12 is not too difficult to do However there are afew gotchas that can ruin your day if MuP VT is not assembled inthe correct order Th
3. By Mick Gulovsen 11 Sep 2014 Ver 1 bigmick58 bigpond com PS2 k b Connector N lt P C a P 0 A y FS wy Female head rio O emale headers l Underside of PCB e a o o gjo To connect to MuP d oio To el J8 J3 mYon sO Solder short elleile e Pads for ololo ry 2 ie Colour j n Selection alajo Sil olojo abe alajo a 4 Male Headers Fojfolle lle N to replace those me cs YZ from MuP 2 bee O So d i o aojnjo e VGA O Q Q 19 ele Connector Boot Load composite Link veea Connector Board Concept MuP VT is a small 49 5mm x 49 5mm PCB that is based on Geoff Graham s ASCI Video Terminal AVT which is a VT 100 based terminal PCB based ona PI C32MX250F128B microprocessor The AVT can communicate via a USB cable toa PC and appears to the PC as a Serial port Full hardware design for the ASCII Video Terminal project can be f ound here htt p geoff g net terminal ht ml MuP VT is designed to plug into MuP and indeed will not function without out it as power is sourced from the 3v3 regulator that is catered for on MuP MuP VT connects to MuP via 3 female headers that are mounted on the underside of the PCB J 3 5 amp J 8 5v power is routed fromthe Mini USB connector J 12 transferred to MuP viaJ 5 and 3v3 is in turn is transferred back up 5 to MuP VT V d be p mere rm an external power source whilst still ected
4. e following is my suggested order for assembling MuP VT with minimal fuss J7 top of the PCB These are solder short pads for selecting the colour that the VGA monitor will display Usually all 3 pad pairs will be solder shorted to select white text J10 bottom of the board These are solder short pads for selecting the baud rate of the communication with the PC viathe USB connection Usually these are left OPEN for software control My recommendation is to not link any of the pads of J 10 as the baud rate can be software selected fromthe configuration menu Shift F12 MuP VT will remember this setting for the next time it is powered up Configuration settings are shown in the table below BAUD RATE oe Table reprinted aoe 115200 eee a eeo 57600 With kind permission ce 38400 eoo 19200 Of Geoff Graham 06086 9600 0eO0O 4800 00 2400 O O O Configurable default 1200 J12 mini USB connector As the only surface mount component it is best to fit this part next I would have liked to use athrough hole part here but whilst through hole mini USB connectors are actually available they are not easy to find and are not particularly cheap Resistors Capacitors Led and X Tal Should be installed next remember to leave a short length of the top leg of R4 to bend over to solder onto the bottom leg of C2 see text in Step 2 above Headers J 3 J 4 5 J8 J9 amp J11 U1 Should be installed now but be careful
5. x5 Due to tracking error VCC 5V J12 1 2 3 4 9 MINI USB a Consider J 6 Closed permanently See text J6 is redundant in Ver 1 ADDENDUM J6 and 5V Power source As mentioned earlier the original intention of J 6 was to allow MuP VT and MuP to be powered fromthe USB socket with J 6 installed OR Powered via MuP from an external 5v source with J 6 not installed Unfortunately due to my stuff up the fix means that the J 6 link option will be not there so the only way to power MuP VT and MuP as well is through the USB port either via a PC connection or a 5v USB Wall W art plug pack It is possible to power through an external supply connected to MuP ONLY if the USB is NOT also plugged in or a track cut to remove power in on pin lof the USB connector Right hand side pin of J 12 as the overlay is shown A picture of where to cut is shown below however really do not recommend this option If doaVer 2 MuP VT I will fix the functionality of J 6 J 11 Bootload The J 11jumper is the bootload link which has the same functionality as the bootload link on Geof f s original Ascii Video Terminal See http geoffg net terminal ht ml For full details of the bootload link and the Ascii Video Terminal project
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