gcc is known to create code that can run on the Tomy Tutor (TMS9995) and I've used it to create a Hello World on the Myarc Geneve 9640 MDOS ( also TMS9995 )   There is no crt.o exactly... As the operating system on the 4A doesn't really have a TTY/keyboard abstraction that anyone uses... (<--- gross generalization for purposes of this context) If targeting a cartridge image you need an entry point function that sets the workspace pointer, then the gcc stack pointer (R10, or aliased as 'sp'
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