Additional stuff

Contents:

The doc subdirectory contains a late draft of the ANSI C 1989 spec that glcc targets.
The horizon subdirectory contains the historical gigatron horizon program and a makefile to compile it for rom v4, v5a, or for at67x's experimental rom. You either need glcc in the path, or need to provide argument CC=path-to-glcc to the make command.
The fp subdirectory contains code to exercise the floating point emulation and show how costly it is to call the function printf. You either need glcc in the path, or need to provide argument CC=path-to-glcc to the make command. You can also provide ROM=xxx or MAP=xxx arguments to experiement.
The tst subdirectory contains small programs to test the console emulation, test the standard io library on the console, and test the function _memcpyext that copies bytes across memory banks when a RAM and I/O expansion board is present.