Siod version 3.5 of MAY-1997.

This and previous versions of SIOD have been ported to small machines
running MS-DOS, CPM, and other operating systems.
Refer to the FAQ and software library sections of the machine
specific news group, mailing lists, and ftp or web sites, searching
for the string SIOD.

The general approach is usually to start out with a kernel
using sample.c and avoiding the highly "unix" conditionalized slibu.c
and then adding OS specific customizations as required.
I use the term "unix" loosely, because slibu.c also takes in VMS
and WIN32 tweeks when the functionality is roughly equivalent.



To get an idea of what size SIOD would take on small
machines such as palm-tops and pda's these figures taken from
the VAX/VMS linker map file are a useful guide.
The VAX being one of the more space efficient 32-bit architectures
from the late 1970's.

The size of the SIOD runtime library is 89,600 bytes on disk.

The size of a runtime object is 12 bytes. Although on a 16-bit machine
this could be reduced to 6 or maybe even 5 bytes while reducing
the basic numeric precision from the 64-bit floating point number
to the less accurate 32-bit representation.

At startup with -n0 (no pre-consed numbers) the system allocates
1142 objects, mostly symbols and built-in procedures.
Note that the memory is allocated from the operating system in larger
chunks, determined by the -h setting.

The default values of these startup flags being set in the siod.c
source file.

The two most important uses of space are (1) string constants,
mainly the names of symbols, procedures, error message and
module version strings, and (2) executable code.

In a very tight machine one could imagine these constant strings
being allocated from a table in a disk file, although given that palm-tops
and pda's don't have disk there would be nothing to gain assuming the
operating system was already smart enough to memory map the objects
efficiently.


String constant breakdown by module, in bytes:

SIOD.C       44
SLIB.C     3671
SLIBA.C    2905
TRACE.C     195
SLIBU.C    1884
MD5.C         0
---------------
total      8699


Executable code size by module, in bytes:

SIOD.C       51
SLIB.C    32890
SLIBA.C   25284
TRACE.C    1527
SLIBU.C   11034
MD5.C      3824
---------------
total     74610