Re: Board/Chip ID

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

Wayne Stewart wrote:
> Ziggy wrote:
>
> > Ok, need help with a couple of expansion boards...
> >
> > One says its a 'videx 44439' but its missing a chip.. no idea what chip i
> > need to shove in there.. its the chip right above the main chip, just 
> > left
> > of one of the character set EPROMS ( says standard 7x9 ). I assume its a
> > 80Col video.. But with out the missing chip I'm afraid to try it.
>
>
> Sounds like the Videx 80 column card. The card has room for three EPROMs
> which contain character sets. Most cards didn't have all three EPROMs
> but you could order them from Videx or if you had an EPROM burner you
> could design your own character set. You can download a PDF of the
> manual at http://www3.telus.net/waynes/videx_videoterm.pdf

Actually, one ROM is the firmware ROM, and the other two are character
set ROMs.  One is standard, and the other is the "alternate" set.

If the board was set up to map the alternate set to inverse characters
(for Visicalc, for example), then the alternate set was not available.

-michael

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Home page:  http://members.aol.com/MJMahon/