Re: broken double hires

[shack@onyx.southwind.net (Randy Shackelford)]

Louis Schulman (louiss@gate.net) wrote:

: >You only need 128K, a rev B or later logic board, and the jumper installed or
: >the little bowtie connected, depending on how old your extended 80 column 
: >card is, to get DHR. No "video card" needed.

: You are right.  I went back and read the "Extended 80-column Text Card
: Supplement."  I never knew about this jumper.  But having double hi-res with a
: video card doesn't ruin programs with standard graphics.  The manual implies
: that using the jumper will render regular graphics incorrectly.  Is this the case?

You have to have the jumper on the first extended 80 col cards to get DHR.
A revision A //e freaks if this jumper is on. Since that revision was quite
short lived (//e's came out in Jan '83 and mine from Aug '83 had rev B), the
great majority of 80 col cards have a bowtie connector which you break the
connection on if necessary, rather than a jumper. Then it's install and forget
for most people. My extended 80 col/RGB interface and RAMworks II cards both
have the connection permanently made. Only my original extended 80 col which
I sold many years ago had the jumper and the directions on using it. So if
the DHR enable connection hosed regular graphics, you would have heard a
million or so complaints by now.

I'm still trying to figure out what kind of video card you're talking about BTW
--
Randy Shackelford
shack@southwind.net