Category : BASIC Source Code
Archive   : QBFAQR01.ZIP
Filename : SCRINF.QRM

===========================================================================
BBS: PC Connect
Date: 04-27-92 (06:26) Number: 10876
From: REX BENNETT Refer#: 10847
To: JEFFERY WOODS Recvd: NO
Subj: GRAPHICS PAGES, 1 of 2 Conf: (11) R-QBasic
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JW>Anyone know how to determine the number of graphics pages you have
JW>available? Does it depend on the amount of graphics memory present, or
JW>is it set by the graphics mode? If it is the graphics mode which
JW>determines the maximum number of pages, how many pages are possible in
JW>each mode?

What hardware you have (graphics card and monitor) determines the
video modes you have available. The video modes (SCREEN #)
determines the number of pages available and the page sizes.

The smallest page size is 2k and ranges up to 300k at 640x480
resolution. Still higher resolution calls for still larger
pages sizes. Below is some information I think you may find
helpful.

(P.S. Does anyone out there know if the [unannounced Basic
programming product from Microsoft] will support the new
higher graphics resolutions?)
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MDPA Screen Modes

The IBM Monochrome Display and Printer Adapter (MDPA) must be used with
a monochrome display. Only SCREEN 0, text mode, can be used with the MDPA.

Rows and Color Display
Mode columns attributes colors Resolution Pages
ÍÍÍÍ ÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍÍÍ ÍÍÍÍÍ
0 80x25 16 3 720x350 1

Hercules Adapter Screen Modes

Rows and Color Display
Mode columns attributes colors Resolution Pages
ÍÍÍÍ ÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍÍÍ ÍÍÍÍÍ
0 80x25 16 3 720x348 1
3 80x25 16 1 720x348 2

CGA Screen Modes

The IBM Color Graphics Adapter (CGA) and Color Display are typically
paired. This combination permits running text-mode programs, and both
medium-resolution and high-resolution graphics programs.

Rows and Color
Mode columns attributes Resolution Pages
ÍÍÍÍ ÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍÍÍ ÍÍÍÍÍ
0 40x25 16 320x200 8
0 80x25 16 640x200 4
1 40x25 4 320x200 1
2 80x25 2 640x200 1

Following are the screen modes that can be used with an EGA:

Rows and Color Display Page
Mode columns Display(a) attributes colors Resolution size Pages
ÍÍÍÍ ÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍÍÍ ÍÍÍÍ ÍÍÍÍÍ
0 40x25 C 16 16 320x200 N/A 8
40x25 E 16 64 320x350 N/A 8
40x43 E 16 64 320x350 N/A "(b)
80x25 C 16 16 640x200 N/A "(b)
80x25 E 16 64 640x350 N/A "(b)
80x25 C 16 16 640x200 N/A "(b)
80x25 M 16 3 720x350 N/A "(b)
80x43 E 16 64 640x350 N/A 4(b)
80x43 M 16 3 720x350 N/A 4(b)
1 40x25 N/A 4 16 320x200 16K 1
2 80x25 N/A 2 16 640x200 16K "
7 40x25 N/A 16 16 320x200 32K (c)
8 80x25 N/A 16 16 640x200 64K (c)
9(d) 80x25 E 4 64 640x350 64K 1
80x43 E 4 64 640x350 64K 1
80x25 E 16 64 640x350 128K (c)
80x43 E 16 64 640x350 128K (c)
10 80x25 M 4 9 640x350 64K (e)
80x43 M 4 9 640x350 64K (e)


VGA Screen Modes

The IBM Video Graphics Array (VGA) adapter offers significantly enhanced
text and graphics in all modes.

Rows and Color Page
Mode columns attributes Colors Resolution size Pages
ÍÍÍÍ ÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍÍÍ ÍÍÍÍ ÍÍÍÍÍ
0 40x25 16 64 360x400 8
40x43 16 64 320x350 8
40x50 16 64 320x400 4
80x25 16 64 720x400 8
80x43 16 64 640x350 4
80x43 16 3 720x350 4
80x50 16 64 640x400 4
80x50 16 3 720x400 4
1 40x25 4 16 320x200 16K 1
2 80x25 2 16 640x200 16K 1
* * * C O N T I N U E D T O N E X T M E S S A G E * * *

PCRelay:PETEXCH -> #60 RelayNet (tm)
4.11 St Pete Programmers Exchg *HST* 813 527-5666
===========================================================================
BBS: PC Connect
Date: 04-27-92 (06:26) Number: 10877
From: REX BENNETT Refer#: 10847
To: JEFFERY WOODS Recvd: NO
Subj: GRAPHICS PAGES - *2 of 2 Conf: (11) R-QBasic
---------------------------------------------------------------------------
****CONTINUED FROM PREVIOUS MESSAGE****

7 40x25 16 16 320x200 32K (a)
8 80x25 16 16 640x200 64K (a)
9 80x25 16 64 640x350 128K (a)
80x43 16 64 640x350 128K (a)
10 80x25 4 9 640x350 64K (b)
80x43 4 9 640x350 64K (b)
11 80x30 2 256 640x480 64K 1
80x60 2 256 640x480 64K 1
12 80x30 16 256 640x480 256K 1
80x60 16 256 640x480 256K 1
13 40x25 256 256 320x200 64K 1
ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
(a) Pages = Screen memory divided by page size. Eight page maximum.
(b) Pages = Screen memory divided by 2 divided by page size. Eight
page maximum.
MCGA Screen Modes

The IBM Multicolor Graphics Array (MCGA) combines the modes of the CGA with
the very high resolution and 256K color modes of the VGA to provide enhanced
text and graphics in all modes.

Rows and Color Display Page
Mode columns attributes colors Resolution size Pages
ÍÍÍÍ ÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍ ÍÍÍÍÍÍÍÍÍÍ ÍÍÍÍ ÍÍÍÍÍ
0 40x25 16 320x400 8
80x25 16 640x400 8
1 40x25 4 320x200 16K 1
2 80x25 2 640x200 16K 1
11 80x30 2 256K 640x480 64K 1
80x60 2 256K 640x480 64K 1
13 40x25 256 256K 320x200 64K 1

The MCGA uses the same display color values as the VGA. For a description
of how the MCGA calculates display color values, see




PCRelay:PETEXCH -> #60 RelayNet (tm)
4.11 St Pete Programmers Exchg *HST* 813 527-5666