ATA MON is a system monitor, which shows the registers and the flags of the 6502 processor at the current state, please see a screenshot below. Version 1.0 from J. Rued was long available in the community, but version 1.3 first was found in 2019.
; version 1.3 of ATA MON DXG 5724 still in PRO format
; version 1.0 of ATA MON with DOS 2.0S
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