8 Jun
2023
8 Jun
'23
3:06 a.m.
On Wed, Jun 7, 2023 at 11:54 AM r.stricklin via cctalk
<cctalk(a)classiccmp.org> wrote:
All of the IBM RT 6151 systems I saw years ago (ugh, 36 years ago
now...) must have all had Megapel display adapters attached to
monochrome or grayscale monitors. That was the early days of Project
Athena and X11. At the time they seemed like reasonably nice systems,
comparable to the more common VAXstation 2000 systems. I imagine if
you have an IBM RT 6151 system now without a Megapel display adapter,
it would probably be difficult to find one.
On Jun 7, 2023, at 11:26 AM, Jonathan Katz via
cctalk <cctalk(a)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.