My learning curve:
1979 4kB: Atari 2600 with Basic Programming Cartridge
1983 64kB: Commodore 64
1988 512kB (exp to 1MB) : Commodore Amiga 500
1990 4MB: IBM PS/2
...
<various systems>
...
2001 VMware Workstation 3.0
...
2004 VMware GSX
2006 VMware ESX 3.0
<various physical and virtual systems>
...
2010 MacBook Pro
2017 Raspberry Pi3 with Retropie