Abstract: In this paper, parallel interface for microprocessor
trainer was implemented. A programmable parallel–port device such
as the IC 8255A is initialized for simple input or output and for
handshake input or output by choosing kinds of modes. The hardware
connections and the programs can be used to interface
microprocessor trainer and a personal computer by using IC 8255A.
The assembly programs edited on PC-s editor can be downloaded to
the trainer.
Abstract: The deterministic quantum transfer-matrix (QTM)
technique and its mathematical background are presented. This
important tool in computational physics can be applied to a class of
the real physical low-dimensional magnetic systems described by the
Heisenberg hamiltonian which includes the macroscopic molecularbased
spin chains, small size magnetic clusters embedded in some
supramolecules and other interesting compounds. Using QTM, the
spin degrees of freedom are accurately taken into account, yielding
the thermodynamical functions at finite temperatures.
In order to test the application for the susceptibility calculations to
run in the parallel environment, the speed-up and efficiency of
parallelization are analyzed on our platform SGI Origin 3800 with
p = 128 processor units. Using Message Parallel Interface (MPI)
system libraries we find the efficiency of the code of 94% for
p = 128 that makes our application highly scalable.