Re: Accessing 80-column mode from CP/M

[Celt <reply@this.newsgroup>]

On 1 Feb 2002 19:18:52 +0100, pausch@saaf.se (Paul Schlyter) wrote:

>In article <ikkl5ukogoa4rrmqq868edbng74jr5261q@4ax.com>,
>Celt  <reply@this.newsgroup> wrote:
>>Any ideas from how I tell CP/M software to use an 80 column card?
>>Display is 40 col from motherboard, all I get from 80 col card is a
>>blinking cursor.
>>
>>No switches or id on 80 col card; it has 3 EPROM sockets,
>>but only ROM2 & ROM3 are present. No reason why ROM1 should
>>have been removed, so I'm hoping it was an option.
>
>You don't tell CP/M software to use 80-col cards, you tell CP/M itself to
>use it.  And you don't evne need to tell CP/M this, because CP/M
>detects the presence of an 80-col card automatically and uses it if it's
>present.  You must put the 80-col card in slot 3 of course.
>
>CP/M was able to recognize only a limited number of 80-column cards
>of course - so it's possible your 80-col card is of a kind that
>your CP/M is not familiar with.

Thanks for the info.  Turned out to be a dead card - Applesoft
couldn't access it with a PR#3 with the card in slot 3.