ENGLISH.TXT

English summary by Michael Covington, 
http://www.ai.uga.edu/faculty/covington

*****************************************
  LUDIPIPO 1.0 programmer for PIC16C84
  ------  LUDI's PIcPrOmmer  ------
  for the serial port
  - direct connection, 4.5cm x 4.0 cm
  Ludwig Catta :-)        12.12.1995
*****************************************

LUDIPIPO is a programmer for the PIC16C84 (only) that attaches to,
and is powered by, the serial port of a PC.  It assumes that the
"high" level voltage coming out of the serial port will be at least
12 volts.  With different software, it could also program the
PIC16F84 and perhaps the 8-pin PIC12 series.

Contents of LUDIPIPO.ZIP:

ENGLISH  TXT        this file, added by Michael Covington
LUDIPIPO PCX        54.966 12.12.95    1:00  Circuit board and parts layout
LUDIPIPF PCX        78.412 12.12.95    1:00  Photo
FILE_ID  DIZ           201 17.12.95    3:25
COM84    EXE         4.571 02.08.95   10:33  Software
COM84    TXT           742 05.12.95   19:12
PIP-02   EXE        88.385 22.10.95   23:31  More comprehensive software
PIP-02   HLP        31.753 22.10.95   23:31
PIP-02   TXT           465 05.12.95   19:18
LUDIPIPO TXT         3.848 17.12.95    3:01  German documentation

The idea came originally from Erik Hermann.  
Here is the schematic:


     TxD ---*-----------------------------
     (3)    I                            I
           ---                          ---
           I I                          I I
           I I 2.2k                     I I 10k
           ---                          ---
            I       I\I                  I
            *-------I-I-----*---------   I
            I       I/I     I        I   I
          ----\             I +      I   I
           /\  \           ---    14 I   I 4
          /  \    5.6V     ---   --------------
	  ----         10u  I    I  Vdd Vpp   I
            I               I    I            I
            I               I  5 I            I
     GND ---*---------------*----I Vss        I
     (5)           22k           I            I
                  -----       12 I            I
     RTS ---------I   I----------IRB6 (clock) I
     (7)          -----          I            I
                  -----       13 I            I
     DTR ---------I   I----*-----IRB7 (data)  I
     (4)          -----    I     I            I
                   2k2     I     I  PIC 16C84 I
     CTS ------------------I     I------------I
     (8)

The pins of the 9-pin serial port connector are in parentheses.
Note: No power supply is required; nor a double-sided circuit board;
and we're not selling anything.

The resistor values are not critical.  Instead of 2.2k, 2.2k, 10k, 22k,
I have used 1.4k, 1.4k, 10k, 16k.  The original plan had a 100-uF
capacitor which I replaced with a 10-uF tantalum.  There's not much to
install, not much to solder.  Be sure to get the diode and the capacitor
installed the right way around.

- Ludwig