Text 2587, 42 rader
Skriven 2015-07-05 11:06:10 av mark lewis (1:3634/12.73)
   Kommentar till text 2580 av Ed Vance (14256.windowsa)
Ärende: Evil OS/2 Device Driver
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04 Jul 15 21:36, you wrote to Mike Luther:

 MikeL>> use at least one 'blank line' at the end of the CONFIG.SYS file to
 MikeL>> solve some strange error problems in some systems.

 EV> When a software program is set up to expect something and it isn't
 EV> there, it causes software to BURP!

 MikeL>> As well DOS operations under OS/2 cannot 'normally' handle more
 MikeL>> than a 2GB file partition as far as I know under a lot of DOS
 MikeL>> stuff I still use.

 EV> That would take more partitions than there are file letters on a 250GB
 EV> HDD.

yup! it takes C thru L to do 2Gig partitions on a 40Gig drive... if one goes
that way...

 EV> But I have read in this echo of a work-around but I can't recall what
 EV> it was called right now.

yep... on OS/2 there's a special "driver" that is loaded in the DOS tasks... it
is called 2gbfix.com... it is little more than a TSR... what it does is to
intercept the calls to the drive space checking routines... if they report
negative numbers (because of the signed number rollover), then it alters the
response so that it returns 2gb or less than 2gb so that the DOS program will
see a valid positive number instead of an invalid negative one...

the largest value available for older DOS programs is stored in a longint (aka
long integer)... a longint is a signed integer 32bits in length making it 4
bytes in size... it has the range of -2,147,483,648 to 2,147,483,647, or -2^31
to 2^31-1... when the value reaches the maximum positive value, it rolls over
to the bottom most value and keeps on incrementing as before... once the value
passes 2gb, it is negative and will remain negative for another 2gb of counting
until it reaches zero and goes positive again... there is no unsigned 32bit
storage capability for large values in old DOS programs...

)\/(ark

... Split your coffee? Call a Chemist!
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 * Origin:  (1:3634/12.73)