On 10/05/2013 03:07 PM, greim wrote:
Hi,
writing a 8086 version of fpc is not so strange as some may think!
There are still some 80186 processors around running in embedded
systems! These architecture is certified for some applications in
industrial and avionik controll.
....
So my wish list:
fpc for 80186, supporting the new extended addressing and writing the
header files for RTOS (see
http://www.beck-ipc.com/en/products/rtos/index.asp) incl. a FPU
emulation !
From what I read from the links you posted, the extended addressing
seems to be just like the regular real mode, except that segments are
spaced not 16, but 256 bytes apart, is that correct? If that's the case,
it should be easy to support - it's just a matter of writing the RTL for
the new OS and using the appropriate linker. FPC for i8086 produces
object files in the standard ROMF file format, they just use the
extension .o, instead of .obj. Note that FPC currently only supports the
tiny, small and medium memory models. Compact, large and huge are
planned, but not started yet. But you can try writing an RTL for RTOS
with the current memory models. In principle, it shouldn't be any harder
than porting the compiler to any new OS, where the CPU is already
supported. And when I implement the compact/large/huge memory models,
the RTOS RTL will have to be adapted to support them. Most likely, the
far heap manager (which doesn't exist yet) will have to be adapted to
support the different spacing between the segments. As for FPU
emulation, it is also on my TODO list :)
Nikolay
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