> On 06/07/2023 1:26 PM CDT Jonathan Katz via cctalk <[email protected]>
> wrote:
>
>
> Hello!
>
> I have an IBM 6152 aka IBM RT system I rescued. (It may be a 6151?)
> I'm 90% sure it has colour graphics. The system does seem to POST
> correctly (according to the LED on the front) but the CRT is dead. I'm
> wondering if anyone has built an adapter to hook this to a VGA
> monitor.
>
> I'm a bit confused by the pinout. It has high and low bits for the RGB
> (and associated grounds for each colour.) So I'm not sure how that
> would work hooking to a more modern monitor.
> http://bio.gsi.de/DOCS/IBM/615x/faqshard.html
>
> Otherwise I need a crash course in fixing CRTs.
>
> --
> -Jon
> +44 7792 149029
I am not familiar with any of that equipment, but from the description here
http://bio.gsi.de/DOCS/IBM/615x/faqshard.html#h33. it appears the video is two
bits of ttl level data for each color. That is how EGA did it, which I think
was about the same time frame (1985 ish.). The scan rates seem rather close to
EGA as well. It might be worthwhile to look into EGA interfacing.
Will
