Mattel Aquarius memory help

[Traindriver69]

Hi all
I have a Mattel Aquarius computer and just got hold of a 16k memory cart but I not sure if it is working I tried loading a game and got a om error message is there anything I can type in to see if the memory is working.
Many thanks in advance

 

[Lawrence Woodman]

The 16k cart provides extra memory from 0x4000 to 0x7FFF. So you could write a simple basic program to exercise each location by poking numbers from 0 to 255 into each location and then peeking at the location to check that the correct number was stored.