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From: hansh@idca.tds.PHILIPS.nl (Hans Helmonds)
Newsgroups: comp.windows.ms.programmer
Subject: Extended memory access from Enhanced/Standard mode
Message-ID: <1326@ssp18.idca.tds.philips.nl>
Date: 19 Dec 90 13:01:04 GMT
Organization: Philips Information Systems, Apeldoorn, The Netherlands
Lines: 19



With MS-Windows running in Standard or Enhanced mode I have a problem
accessing an IO board from a windows program.

The board occupies 1 Mb in extended memory at D000:0000, it is not
detected at boot time.
I try to read and write data from conventional memory to the board
using Int 15H, function 87H (Move extended memory block). This
function returns 0 (Ok) if the program runs in Real mode, but returns
2 (exception interrupt error) if it runs in Standard or Enhanced mode.

Who can give me a hint about the easiest way to tackle this problem?

Thanks,

   Hans Helmonds  |  hansh@idca.tds.PHILIPS.nl  |  Tel +31 55 432161
      Philips     |  Apeldoorn, the Netherlands |  Fax +31 55 433488