==== PC Pointer ====
<wrap right>
{{:projects:ps2serial.jpg?200|}}
</wrap>

This is a very simple PS/2 to serial mouse protocol converter which uses
a PIC micro-controller and a MAX232.

=== Schematics ===

Two schematics are presented for two different PIC micros. It should be trivial to port this application to any other PIC micro-controller since they all share similar peripherals.

{{:projects:pic16f628a.png?200}}
{{:projects:pic16f688.png?200}}

=== Install ===

First install [[:tools:gputils|gputils]] for gpasm and [[:projects:pickle|Pickle]] for ICSP (if you are using a Velleman K8048 for example).

PC Pointer needs some support files from [[:projects:pickle|Pickle]] so we install those first.
<code>
hg clone http://hg.kewl.org/pub/pickles
cd pickles
make
make install
cd ..
</code>

Now we can fetch PC Pointer and and assemble the code.
<code>
hg clone http://hg.kewl.org/pub/PCPointer
cd PCPointer
make
</code>

The resultant hex file is used to program the chip. Here I use [[:projects:pickle|Pickle]] and I have targeted the 16f688.
<code>
p14 program pic16f688.hex
</code>

=== Usage ===

Plug an old PS/2 mouse or newer USB mouse with PS/2 support into the input port of the circuit. Connect the serial output into the RS232 input of your old computer.

Boot into DOS and detect the mouse with MOUSE.COM 8.20.
<code>
MOUSE.COM /C1
</code>

Disable it like this.
<code>
MOUSE.COM OFF
</code>

Windows 95 should auto-detect the device as a generic serial mouse.
=== Resources ===

[[https://web.archive.org/web/20180202174841/http://www.computer-engineering.org:80/ps2protocol/|PS/2 protocol]]