B+W Board on Color CRT Monitor
- Thread starter alfa75
- Start date
Most B&W boards output what is in effect a monochrome composite video signal. You can put video out to a phono centre pin and ground to the outer part and plug it to an AV input and you'll get a picture.
It is possible to connect it to an RGB monitor but it depends on the board. Normally there is a video and sync which is combined but you can modify it to give a combined video and sync output.
It is possible to connect it to an RGB monitor but it depends on the board. Normally there is a video and sync which is combined but you can modify it to give a combined video and sync output.
I managed to cmbined the B&W signal from my moonbase to make a psuedo RGB signal. Net result a space invaders which looks similar to the originals with coloured strips but its on a colour monitor.
You also need to tap the sync signal off the boards as RGB has separate sync
You also need to tap the sync signal off the boards as RGB has separate sync
I used the video signal and found the separate sync on the original board. fed the video through couple of gates in a 74LS00 I seem to remember and also fed in some timing signals from the video generator circuit. By doing this, I made a RGB signal which used the original B/W one but switched it on and off at certain lines. This had the effect of making the top part of the screen say light blue, then the next band was red etc. It isnt the same colours as the acetate filters but as I wanted to fit a colour monitor if made a more colourful display than just B/W. I will see if I can dig the circuit out and post it here.
The B/W signal is composite. That means it has video and sync combined. The RGB monitors use the three video signals R,G and B but also have a separate sync input. Sometimes two sync inputs, H and V. Mine just used a single sync which has H and V combined.
andrewsm2017-02-17 23:51:10
The B/W signal is composite. That means it has video and sync combined. The RGB monitors use the three video signals R,G and B but also have a separate sync input. Sometimes two sync inputs, H and V. Mine just used a single sync which has H and V combined.
andrewsm2017-02-17 23:51:10