Also I noticed at the top of the Workbench Desktop it says: 1628472 graphics mem 0 other mem. How can I tell how much RAM it has?
I guess you have 2MB of memory of which 0.4 MB are used up and 1.6 MB are still available.
If you want to know exactly, open a shell window and enter Avail. Then you'll get a list of how much memory there is for all memory types.
In your case you only have "chip" memory. This is the memory which is available to the custom chips for DMA (hence the name). Because a fixed number of CPU cycles is reserved for DMA, this memory is slow in regard of CPU access. That's why the "other mem" is called "fast" memory. There are no CPU cycles reserved and the CPU can access it with its full speed.
There is also a memory area called "slow" or "bogo" mem. This is where the usual memory expansion of the A500 maps to. This memory is not available to the custom chips but still leaves out the reserved CPU cycles.
Bye,
Thomas