From:	sparhawk AT eunet DOT at (Gerhard Gruber)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: help with biosequip
Date:	Sat, 13 Jun 1998 09:53:21 GMT
Organization:	Customer of EUnet Austria
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To:	djgpp AT delorie DOT com
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Destination: "Ming" <look AT post DOT maybe>
From: Gruber Gerhard
Group: comp.os.msdos.djgpp
Date: Fri, 12 Jun 1998 20:09:11 -0400:

>     1111 1100 0000 0000
>     5432 1098 7654 3210  Meaning
>
>     ---- ---- ---- ---X  1 = disk drive(s) installed
>     ---- ---- ---- --X-  1 = math coprocessor installed
>     ---- ---- ---- XX--  System memory 00=16k 01=32k 10=48k 11=64k (non
>PS/2)
>     ---- ---- ---- -X--  1 = pointing device installed (PS/2)
>     ---- ---- ---- X---  not used on PS/2
>     ---- ---- --XX ----  initial video mode: 01=CO40 10=CO80 11=MONO
>     ---- ---- XX-- ----  disk drives 00=1 01=2 10=3 11=4 (zero if bit 1=0)
>     ---- ---X ---- ----  1 = no DMA available
>     ---- XXX- ---- ----  number of serial ports installed (000=0 001=1 etc)
>     ---X ---- ---- ----  1 = game port adapter installed
>     --X- ---- ---- ----  1 = internal modem installed (PS/2)
>     --X- ---- ---- ----  1 = serial printer attached (non PS/2)
>     XX-- ---- ---- ----  number of printers installed (00=0 01=1 10=2 11=3)
>
>
>I know a little c/c++ 4th year of college but we only do  algoritms our
>computer science department is more theory  search alogarithms and things of
>that nature not real coding so I am stuck learning any thing on my own
>pretty much, just going to get the paper saying I studied computers to get a
>job.
>
>
>I have played with this even the examples but do not understand it.  I do
>know what bit code is but how do I use this. I need a clear understanding of
>this.
>
>example what do I code to give cprintf("you have %d hard drives",
>numbdrives);

((numbdrives >> 6) & 0x0003) + 1

This shifts the 2 bits, indicating the number of drives, to the first position
and masks out all other bits that might be set. The +1 is needed because 0 =
1, 1 = 2 etc.
--
Bye,
   Gerhard

email: sparhawk AT eunet DOT at
       g DOT gruber AT sis DOT co DOT at

Spelling corrections are appreciated.

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