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George Koehler 93e01eb5d1 Teach i80 ncg to use libfp. Enable ack -mcpm -fp. 
Old .o files stop working if they use floating point.  One must
recompile those files.  Old files don't call libfp in the correct way,
and may use symbols that I removed from libem.  I don't keep old
symbols in libem/flp.s, because a program that pulls both libfp and
flp.s would get "multiply defined" errors in the linker.

I teach mach/i80/ncg/table to use libfp by copying or adapting the
patterns from mach/i86/ncg/table.  I did not test all the patterns,
but I did use `ack -mcpm -fp -O4` to compile examples/mandelbrot.c,
then I ran it in the emulator YAZE-AG.  It worked, but it was slow.
2018-04-25 16:09:56 -04:00
..
include Change sbrk() to take an int rather than an intptr_t (following the OpenBSD way 2016-11-23 22:06:24 +01:00
libsys Change sbrk() to take an int rather than an intptr_t (following the OpenBSD way 2016-11-23 22:06:24 +01:00
boot.s Apply fix contributed by George Koehler: 2013-06-02 22:02:15 +01:00
build-pkg.lua Turns out I wasn't building the syscall libraries. Do so. 2016-08-14 11:23:57 +02:00
build-tools.lua Biggish refactor to break cycles; my build rules were full of them. cpm builds, 2016-08-14 01:39:40 +02:00
descr Teach i80 ncg to use libfp. Enable ack -mcpm -fp. 2018-04-25 16:09:56 -04:00
README Documented floating-point status. 2007-04-28 22:34:47 +00:00

README 

# $Source$
# $State$
# $Revision$


The cpm platform
=================

cpm is an i80-based BSP that generates CP/M executables that can be run on any
CP/M-compliant machine.

This port only implements a very limited set of syscalls --- and most of those
are stubs required to make the demo apps link. File descriptors 0, 1 and 2
represent the console. All reads block. There's enough TTY emulation to allow
\n conversion and local echo (but it can't be turned off).

There's a special, if rather minimilist, interface to give applications access
to CP/M. See include/cpm.h for details.

IEEE floating point is not available. Attempts to use floating-point numbers 
will cause the program to terminate.


Example command line
====================

ack -mcpm -O -o cpm.com examples/paranoia.c

The file cpm.com can then be run.

(Although note that Paranoia is very big, and you'll need a CP/M machine with
lots of memory for it to fit. Which it does, just.)


David Given
dg@cowlark.com