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From: zhou@brazil.psych.purdue.edu (Albert Zhou)
Newsgroups: comp.sys.tandy
Subject: Re: TANDY GRAPHIC DRIVER
Message-ID: <11535@j.cc.purdue.edu>
Date: 21 Nov 90 19:39:03 GMT
References: <11531@j.cc.purdue.edu> <6347@vice.ICO.TEK.COM>
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Reply-To: zhou@brazil.psych.purdue.edu (Albert Zhou)
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In article 2924, Bob Beauchaine writes:

> The interrupt is the same set video mode interrupt that all of the other
> modes use : BIOS interrupt 16 (decimal), service 0 (AH = 0), with the
> required video mode in the AL register (the Tandy (PCJr) modes are 9 for
> 320 x 200 x 16 color, and 10 for 640 x 200 x 4 color).

    These two modes are not really Tandy mode in which DESKMATE was written.
 In the third mode, you can get 640 x 200 x 16.

> The video ram starts at the same location as CGA (it really is just an
> enhanced CGA mode that never caught on), B800:0000 hex.

     I suppose in the third mode there is a separate RAM board since the
  memory requirement is so big.