[Coco] Program for test pattern for crt alignment/convergence?

[Richard Goedeken]

Here is something that I wrote a few years ago for exactly this purpose:

https://www.fascinationsoftware.com/media/Coco3_RGB_Monitor_Test_v1.0.zip

There is a README basic program included.

Richard


On 8/8/22 09:28, Don Barber via Coco wrote:
> Hi folks, acknowledge I'm sending a lot to the list recently but I got a lot 
> of projects going on.
> 
> I'm replacing the tube of a Commodore 1084S-D1 when the old crt tube 'let the 
> vacuum out.'
> I've got it aligned pretty close by eye but to get it exact I'd like a proper 
> test pattern, like white-on-black grid lines to get it just right. I've 
> already soldered up the cable to get this monitor working on the coco so was 
> hoping to be able to generate such a test pattern from the coco.
> 
> As such, anyone know of a coco program to generate decent test patterns, 
> specifically a grid / cross-hatch pattern?
> 
> I found Coco Color Bars ( 
> https://colorcomputerarchive.com/repo/Disks/Demos/Coco%20Color%20Bars%202020%20(Jason%20Reighard).zip 
> ) which is awesome - but still looking more for the grid test pattern. Figure 
> I could probably whip something out in basic without much effort but thought 
> maybe someone would know of an existing one?
> 
> Alternatively I could probably get a CGA cable together to hook up this 
> monitor to an early PC if someone has an early dos program to generate a test 
> pattern.
> 
> Don
> 
>