Processor 6502C Clock speed 1.79 MHz (NTSC) 1.77 MHz (PAL) RAM 128 KB ( 64 KB Main memory, 64 KB banked ) ROM 24 KB Release year 1985 Production stopped ??? O.S. version(s) XE O.S. Cartridge port(s) 1 Adress space : 16 KB Built-in software Self-Test Basic Revision C Controller port(s) 2 Function keys Reset, option, select, start, help, Parallel Bus Interface No, 'Enhanced Cartridge Port' instead Cosmetics Grey casing, PC-Style key stroke Additional Incorporates a 'Freddy' chip for memory management of the 64 KB banked memory.