REMINDER and REMINDERCHECK require at least AmigaDOS 2.x and ReqTools.library6. They were developed and have been tested on Amiga 2000 with GVP G-Force 68030/25MHz, 1 MB Chip and 5 MB Fast running AmigaDOS 2.04. They worked also with the G-Force turned off (i.e. normal Amiga 2000 with 1 MB Chip and no Fast). There is no reason why they shouldn't run on any Amiga with at least 2.x, however.