CHOLESTEROL FREE PARRALLEL PORT EPROM PROGRAMMER - Programms 2764 to 27512 (ADAPTOR FOR 2716/32 AND SOME MICROS) - Fast or Slow Programming - Easy to Assemble - Self Diagnosing - Inexpensive to Build - Easy to Obtain Parts (Australia) - Full Schematics, PCB and Overlay - Free Software - C Source Code Supplied - Easy Enough for a 5 year old tibetan spaniel to build KISS Instructions The following instructions form a quick guide for experienced constructors. If you have any doubts about anything read the complete instructions in the file INS_RTFM.TXT Assembly. Install the wire links first as the ones under the VRegs are really hard to get at latter. Apart from that All polarised components face the same way and the IC's face the same way. The only thing you have to watch is the Diodes directions (you can follow an overlay can't you) and the cap under the last VReg is a Tant not an Electro. Also if the cases on the VRegs look like they will touch wrap the LM317 in tape as its case is output rather than ground. R14 shown in the overlay as ???? is choosen according to the type of 74595 you are using. Also Q7 the optional MPSA65 Xistor will need to be installed with some chips to make the clock fast enough. If Q7 is installed the track next to it will need to be cut where marked. Chip Type R14 Q7 ANY LS 4K7 No Texas HC 560R No Motorola HC 220R Yes Testing. Plug the programmer into 12VAC and check that there is 5V at the IC's. Next check that there is no more than about 5V at any of the parrallel port pins. If you are satisfied plug the unit into a PC. Run the Program TESTHW.EXE and follow the screen instructions to test EPROM voltages. If all is OK Run-Test the unit. The Software. The programmer uses different software for different EPROMS as outlined below EPROM Type Fast Program Slow Program 27X64 F64.EXE S64.EXE 27X128 F128.EXE S128.EXE 27X256 F256.EXE S256.EXE 27X512 F512.EXE S512.EXE Also when programming 27X512's you must move the switch into the down position. WARNING - DON'T PLUG AN EPROM IN UNTIL THE SW TELLS YOU TO. When run the software searches all three ports for the hardware and calibrates its timmer. Apart from that the software is menu driven and self explanatory. ENJOY IN MODERATION.