On 23 Apr 1997 pubpc1@library.ucla.edu wrote: > > BTW, does anyone know why 9 42256 chips make up a 256K bank in an > XT while only 8 42256 chips make up 256K in an Apple IIe? > The XT uses parity checking. For every 8 bits of memory there is a parity bit. So, 9 chips on the XT gives you the equivalent of 8 chips on the Apple IIe (which doesn't use parity). Paul. pschultz@med.wayne.edu Paul Schultz