> On Jun 7, 2023, at 11:26 AM, Jonathan Katz via cctalk <cctalk@classiccmp.org>
> wrote:
>
> Hello!
>
> I have an IBM 6152 aka IBM RT system I rescued. (It may be a 6151?)
You have a 6151, the 6152 has VGA graphics (is built inside a PS/2 Model 60)
> 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.
You’re going to run into trouble, then, as the video signal is completely
incompatible with a normal VGA multisync monitor. It’s TTL color, interlaced,
with a horizontal scan frequency less than 31kHz. 720x512 interlaced.
The RT knows how to use a “standard” IBM PC MDA or EGA adapter. Might be better
off using one of those instead, at least for now.
ok
bear.
