Parallel Port Debug Tool V1.0 Copyright 1997 Craig Peacock Distribution _____________________________________________________________________________ This program can be freely distributed provided that this file is distributed with the program. No modifications can be made to the software. Disclaimer _____________________________________________________________________________ The author can not be liable for damages relating from the use of this program or accompanying material. This includes losses relating to hardware, software, data or otherwise. *** Use it at your own risk. *** General Description _____________________________________________________________________________ The parallel port debug tool is a handy utility when debugging devices connected to the parallel port. It gives a visual display of the status of the three software registers used by the Standard Parallel Port. 픔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캘 � Base Address 278 Hex 632 Decimal LPT 1 [ ] LPT 2 [ ] � 픔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캘 The parallel port base address can be entered in one of two boxes. If you wish to enter it as a Hexadecimal number then it would be placed in the box labeled Hex, otherwise if it is in decimal form it can be entered in the box labeled Decimal. There is another option by selecting either LPT 1 Or LPT 2. As stated in the authors text found at "http://www.senet.com.au/~cpeacock/parallel.htm" BIOS will search for the first port at 3BCh. If a parallel port is found there, it will be labeled LPT1, then BIOS will search for the next port, when found it will be labeled with the next unused label, thus LPT 1 may not be at 378h but rather at 3BCh. The Parallel Port Debug Tool will assume that LPT 1 is at base address 378h or 888 dec and that LPT 2 is at 278h or 632 dec. Please Note : The Parallel Port Debug Tool is not very selective about which addresses it allows and which addresses it doesn't. Therefore entering certain addresses and then performing alterations to their registers can crash the computer or result in Data Loss. *** Use with Caution. *** 픔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캘 � Printer Port Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9 � � Bit Number 0 1 2 3 4 5 6 7 � � Status [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] � 픔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컫컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴캘 The next window you will confront is the status of the data port. This register has read and write capabilities. If your port is not bi-directional you should see the status of the last byte written to this port. To write to the port you have two choices. You can use the mouse to turn each bit on and off. Simply click in side of the [ ]. Another method is to use the function keys. F1 toggles Bit 0, F2 toggles Bit 1, . . . . & F8 toggles Bit 7. 픔컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컫 � Base + 1 Status Port (Input) � � � � Bit 7 [ ] Busy (Pin 11) � � Bit 6 [ ] ACK (Pin 10) � � Bit 5 [ ] Paper Out (Pin 12) � � Bit 4 [ ] Select In (Pin 13) � � Bit 3 [ ] Error (Pin 15) � � Bit 2 [ ] IRQ (NOT) � � Bit 1 [ ] Reserved � � Bit 0 [ ] Reserved � 훤袴袴袴袴袴袴袴袴袴袴袴袴袴袴袴袴賈 The above window shows the status of the Status Port. The Status port is read only, thus you cannot write to this port using this debug tool. 쩡컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� � Base + 2 Control Port (Open Collector) � � � � Bit 7 [ ] Reserved � � Bit 6 [ ] Reserved � � Bit 5 [ ] Enable Bidirectional Port � � Bit 4 [ ] Enable IRQ via ACK (Pin 10) � � Bit 3 [ ] Select Printer (Pin 17) � � Bit 2 [ ] Initialize Printer (Pin 16) � � Bit 1 [ ] Auto Linefeed (Pin 14) � � Bit 0 [ ] Strobe (Pin 1) � 鳩袴袴袴袴袴袴袴袴袴袴袴袴袴袴袴袴袴袴袴袴袴� The above window represents the Control Port. This port/register is read and write capable. You can use the mouse to turn on and off the individual bits and watch the status of the inputs at the same time. To exit the program at any time, press ESC. _____________________________________________________________________________ This Document is Copyright 1997 Craig Peacock The author can be contacted via Email - cpeacock@senet.com.au For more information - http://www.senet.com.au/~cpeacock