DioXygene is a project of a new calculator using a motorola processor. It will have a multitasking operating system and a support of RPL, C and ASM language directly on calc.
ASM68000 is a usefull editor to write ASM code for TI89 calculator. It is a simple IDE written in TCL/TK, so it works with the TCL/TK interpreter. You can found it at the adress www.sun.com/960710/cover/dltcl.html. I hope it will help you in your ASM prog