Q35357: BLOAD Can Fail with Older Monochrome Cards; Newer Cards OK

Article: Q35357
Product(s): See article
Version(s): 2.00 2.01 3.00 4.00 4.00b 4.50
Operating System(s): MS-DOS
Keyword(s): ENDUSER | B_BasicCom | mspl13_basic
Last Modified: 14-FEB-1991

On older monochrome cards, BLOAD may not work correctly. The symptoms
are that BLOAD displays only the first four lines of the screen and
then garbage or nothing else. These symptoms are caused by a problem
in the monochrome card. Updating the monochrome display card should
solve the problem.

With Microsoft QuickBASIC versions 4.00 and 4.00b and Microsoft BASIC
Compiler versions 6.00 and 6.00b, the problem occurs when loading
either text (SCREEN 0) or graphics (Hercules SCREEN 3) with BLOAD. One
customer also reported this behavior for Microsoft BASIC Professional
Development System (PDS) versions 7.00 and 7.10.

Code Example
------------

'Note that this problem can also occur in screen 0:
DEF SEG = &HB000   ' &HB000 is starting paragraph of monochrome memory
SCREEN 3, , 0, 0
LINE (100, 100)-(300, 300)
BSAVE "test.img", 0, &H8000  ' &H8000 hex is 32,767 decimal
CLS
BLOAD "test.img", 0

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