the circuit so that it mounts on UB8 with three wires
going out to the video connector and one to the border
On my prototype, I removed the original monitor and
connected my circuit to a Commodore 1084-S monitor,
which supports both RGBI digital and RGB analog signals.
Eventually, I want to try mounting a color monitor in the
original PET monitor housing so that it looks like
Commodore might have actually built a real color PET.
I initially started with a 4032 PET and the solderless
breadboard. If you have a 4000 series PET with the correct
motherboard, you will need to add the extra missing
memory and support chips. My second prototype with a
point-to-point board was built into an 8032 PET. If you
have an 8000 series PET, those chips are already installed.
These systems normally come with different keyboards,
and I wanted to have the version with the ESC key so I
could do development on the EDITOR ROM.
The project presented
here is just a starting point.
Many improvements can be
made. I have started
designing the next
generation ColourPET board
(Figure 9). We could
combine the digital and
analog methods, or we
could add programmable
FIGURE 9. Design for the next generation ColourPET board.
FIGURE 7. Breadboard connected
to the PET.
FIGURE 8. Final P2P board mounted on video
connector, ribbon cable to latch (top), white wire to
remap RAM, and yellow clip to border blank signal.
Editor ROM Webpage
Editor ROM Source
50 September 2015