A powerful 6502 Monitor/Debugger
For use on ATARI 1200XL, 600XL, 800XL, 800XLE, 65XE, 130XE and XEGS
Coming Soon: ULTIMON II a Cartridge based update of the original product, with more functionality, a better look and compatible with OSA, OSB, XL/XE and MyBIOS (the most compatible) Operating Systems.
Burn this chip to a 27128 Eprom and replace the OS chip (this is the old original product as sold in 1985/1986).
This is a completely re-written PDF Reference Manual for the original product (to accompany the ROM).