Hawkeye/Kefrens ³¼INDICATORS¼³ ¹ This article will contain some information about how to make indicators for nearly everything on the Amiga. In most case only a lightdiode, a resister and a soldering iron is required. You can make hundreds of different indicators. Ex. if you would like to know if the disk is writeprotected or not without taking it out of the diskdrive. Or if you wanna know if the diskdrive is saving. First, buy some LEDs and some resitors. The size of the resister can be calculated like this: We know that the LED use 1,5 V - 0,020 A and the supply- voltage is 5 VDC. Then the "formula" will be: (5V-1,5)/0,020=175 Ohm. The closest standard-resister we can find is 180 Ohm. So buy those. Now the 'hard' thing will come !!! (The connection). First find the 5 V. You can find it nearly everywhere, but it is best to take it from the 86-pin-connector. It is the one, used for Action Replay, harddisk etc. If you have placed the Amiga so the 86-pin-connector points at you, the pin which gives 5 volt is no. 3 from left. Solder a little wire on this pin, (use as little space as possible, or your harddisk or AR can not fit in. Take the other end of the wire and solder a resister to it. Now solder the LONG leg of the lightdiode on the resister and a wire on the short end. This wire which now is "free" is to be used as the indicatorwire. The following list, shows which IC/Leg you should solder on, to get which thing you wants to indicate !?!?! Effect IC No. Leg Buserror Processor 68000 22 Interrupt 1 Processor 68000 25 Interrupt 2 Processor 68000 24 Interrupt 3 Processor 68000 23 Pause Processor 68000 17 Reset Processor 68000 18 Bus Grant Processor 68000 11 Bus Request Processor 68000 13 Bus Grant Ackn. Processor 68000 12 Valid Mem. Addr Processor 68000 19 Extra Mem. On Gary 5719 32 Rom Enable Gary 5719 21 Clock Read Gary 5719 22 Clock Write Gary 5719 23 Keyboard Reset Gary 5719 5 Motor on Drive Gary 5719 7 Dram Writeenab. Fat Agnus 8371-72 21 Joystick Fires Fat Agnus 8371-72 78 Seriel Recieve Paula 8364 41 Seriel Sends Paula 8364 40 Disk Saves Paula 8364 38 Disk Loads Paula 8364 37 Composite Sync Denise 8362 32 (Blanking Sig.) Filter On U7 8520 3 Diskchange U7 8520 4 Disk WProtect U7 8520 5 Head Track00 U7 8520 6 Drive Ready U7 8520 7 Drive Steps U8 8520 10 Side A/B U8 8520 11 Diskindex U8 8520 24 68000 Read/WriteU8 8520 22 This is perhaps half of the list, but some are rather useless !!! If you by some strange reason want the complete list, just write me !!! This project is dangerous for the health of your computer. Not if you make it as written BUT if you have NO electronic experience, ask one of your friends to do it. Also remember to count right on the IC's (Remember the little 'notch' were you start counting): _____________ 1| |_| |64 2| |63 3| |62 4| |61 5| |60 6| |59 7| |58 Etc Etc. It's ofcourse not like this on the Fat Agnus, but ask at your local computer- shop for a diagram over the 8372... It's also important NOT to make to many indicators because the powersupply cannot handle to much amps. But this should be no problem either, simply use 2 milliamp. LEDS !!! The very techminded would ofcourse make this with buffers. I can recommend 4010 or 74367 to be used.