My 1st computer = ZX81 - 16KB RAM, 16KB ROM ( 1983 ). I played PACMAN and many other games in ZX81.
Since then I used:
-ZX Spectrum ( Z80, 16K ROM, 48K RAM ) (1985)
-MSX ( Z80, 16KB ROM, 64KB RAM ) ( 1986 )
-Commodore Amiga 500 ( MC68000, 256KB ROM, 1MB RAM ) ( 1989 )
-Commodore Amiga 1200 ( MC68020, 512KB ROM, 2MB RAM ) (1991 )
After that many PC compatible ( 486, pentium, pentiumII, pentiumIII ,etc )
ZX81 and the 300bps K7 tapes are a permanent memory to me.




) AMD dreamt up the Fusion concept, ZX80 had ONE processor taking care of both computing and graphics!!
Half a second computing and half a second drawing a dot on the screen, and so on! Those were the times… 

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