> Programmer Software for Free
> ============================
> I built the 16C84 in-circuit programmer
> from the application note AN589 -- it worked perfectly first time. I
> have built a rudimentary software user interface for the PC in Turbo C
> (using Analog Design Specialists low level code).  With this I can
> download .hex files from MPASM directly into the device.  The code
> only overwrites locations which require changing, to reduce eeprom
> cycles during development.
>
> I'd be happy to release my source code (although it still has some
> very rough edges!) if there is demand.

I homebrewed two PIC program softwares myself [one in TC, one in QuickBasic
when I accidentally left the TC one at home].  What do you use for printer
port pins?  I used to use 1=Strobe=D7, 2=Data0=Clock 3=Data1=/MCLR 4=+VPP
[high turns it on] but unfortunately on Toshiba laptops pin 1 is not open-
collector, and pin 14 [my second choice] is open-collector but its readback
register shows the latched value rather than its physical state.  Thus, I
strap 14 and 15, both of which go to D7 on the PIC; 14 is the output, 15 the
readback.  How do you work things?