🚀 go-pugleaf

In article <373EFB4B.79B169B4@ls3.cs.uni-dortmund.de>,
  kokoll00@marvin.cs.uni-dortmund.de wrote:
> Robert AH Prins wrote:
> >
> > In article <373CA7E2.52A4@lmic.state.mn.us>,
> >   Pete Olson <pete@lmic.state.mn.us> wrote:
> > > Robert AH Prins wrote:
> > > >
> > > > Hi all,
> > > >
> > > > As you may remember, I once posted a message that told you that
the
> > > > builtin assembler in TP6 and BP7 allows the use of AAM & AAD
with an
> > > > operand, ie AAD 16 will result in "D4h 10h" being generated. If
you
> > are
> > > > willing to sacrifice a little compatibility, and are prepared to
> > always
> > > > code AAD 10 & AAM 10, you can use the plain AAD and AAM
instructions
> > to
> > > > encode two more useful two-byte (non-operand!) instructions, and
one
> > > > that seems to come to mind to me is RDTSC, (OF 31). To make the
> > patch,
> > > > open a backup of your compiler in your favourite hex-editor,
search
> > for
> > > > AAD/AAM and then for "D4 0A" (if AAM) or "D5 0A" (if AAM)
closely
> > > > following them and replace these two bytes with your favorite
> > two-byte
> > > > Pentium (P2/P3) opcode bytes.
> > > >
> > > > I tested it on TP6, and it works!! (Which is very, very useful!)
> > > >
> > > > ********** YOU MUST NOT CHANGE THE ACTUAL MNEMONIC! **********
> > >
> > > This seems like an awful lot of work.  Why not just
> > >
> > > asm
> > >    db $0f,$31   {rdtsc}
> > > end;
> >
> > As yet, it is, but this is only a first observation resulting from
my
> > work in progress, disassembling TP6' TPC.EXE (to be followed by
BPC.EXE)
> >
> > Getting it in a state where it can be reassembled, it might allow me
to
> > actually modify the builtin assembler, and/or add specific 386+
> > optimizations to the generated code.
> >
> > NB: Don't tell me I should be using FPC/GNU/P32/V-Pascal/TMT, I use
> > Pascal only for hobby purposes and have no problem in running DOS on
a
> > 350 MHz PII.

> When you don't have any problem in running DOS on a 350 MHz PII (I do
> the same, by the way), then you might want to take a look at some
> screenshots taken from my DOS GUI (actually, something like Windows
> 3.x). Check out the website at
> http://ls3-www.cs.uni-dortmund.de/~koll/DW
> Be careful, the page is about to move to http://www.deskwork.de

They look very impressive!

BTW, in addition to my earlier post, FNENI (Enable interrupts, an
obsolete 8086 instruction) has the same hash-key as RDTSC, so instead of
sacrificing the stand-alone AAM, you can use FNENI. Replace the text,
and change the four bytes following it into "00 01 0F 31". It seamlessly
enables RDTSC.

Robert
--
Robert AH Prins
prinsra@williscorroon.com


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