Comes with 1MB of RAM, consisting of four 256K SIMMs.
On a Plus when 1MB SIMMs are installed, the 256KBIT resistor must be clipped to enable recognition of the higher density SIMMs. A 2.5MB configuration has a 1MB SIMM in positions 1 and 2 and a 256K SIMM in position 3 and 4.
Comes with 128K of ROM and a 800K floppy drive.
Serial Port with the phone icon in the Plus does not support synchronous modems. It only supports handshaking on the output, not on the input.