QB 4.5 and emm386

 BBS: Inland Empire Archive
Date: 10-21-92 (20:35)             Number: 379
From: DAVE CLEARY                  Refer#: NONE
  To: RICK PEDLEY                   Recvd: NO  
Subj: QB 4.5 and emm386              Conf: (2) Quik_Bas
In a message of <17 Oct 92 15:19:14>, Rick Pedley (1:249/140) writes:

 >You're not the first one to discover this.  I can't remember who
 >it was now (maybe Dave Cleary), but someone was talking about it
 >here around a year ago.  Something to do with QB doing extra
 >memory checks on each calculation.  Anyway, it _isn't_ anything
 >you're doing wrong.

It is with floating point operations. QB's FP emulation uses software
interrupts. When doing interrupts with a memory manager,
the processor has to switch from protected to real mode. It
is the same with all interrupts. It is just more noticeable
with the FP ones because they happen very frequently.

Later           Dave

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