Re: Looking for Videx VideoTerm ROM images

["Michael J. Mahon" <mjmahon@aol.com>]

Ian Primus wrote:
> I've got a Videx VideoTerm board that I believe has corrupt ROMs. At
> least, I think it's a VideoTerm, not an UltraTerm or anything else -
> it just say VIDEX on the lower right, has a five pin header on the
> front for video output, and connects to a toggle switch plate on the
> back of the II+.
>
>  When I type PR#3, the 40 column display gets corrupted with garbage
> characters, and nothing appears when I switch over to 80 column. The
> labels (if any) have long since gone missing from the EPROMs. Oddly
> enough, there are two ROM chips, and one empty socket for a ROM. The
> top chip is a 2716, lower one is a 2708. The empty socket is the one
> at the upper left. Perhaps the 2716 was used in favor of two 2708's,
> hence the empty socket?  I don't know. But, I'd like to try replacing
> the ROMs. I've already swapped the RAM, that's not it.
>
> I have a ROM burner, so if anyone has ROM images, I'd greatly
> appreciate it.
>
> Thanks!

If the character generator EPROM is bad, then the patterns displayed
will be completely consistent--if you repeat a character, you'll see
lots of copies of *exactly* the same bit pattern--as if you have some
"alien" font.  ;-)

If this is not the case, then I doubt it's the EPROM.

-michael

NadaNet 3.1 for Apple II parallel computing!
Home page:  http://home.comcast.net/~mjmahon/

"The wastebasket is our most important design
tool--and it's seriously underused."