The original Amiga 1000 is the only model to have 256 kB of Amiga Chip RAM, which can be expanded to 512 kB with the addition of a daughterboard under a cover in the centre front of the machine [REF].
The Amiga 1000 features an 86-pin expansion port (electrically identical to the later Amiga 500 expansion port, though the A500's connector is inverted).