For testing old Computers you will need a lot of different power supplys with AC and DC Voltage.

I put them together and we got one to rule them all
Meanwell RT-65B and a 9V AC Power Supply

9V /2100mA
5V / 5,0A
12V / 2,8A
-12V /0,5A

So it works @:

• Atari 8 Bit Computer like 600XL, 800XL, 1200XL, 800XE, 64XE, 130XE
• Atari 8 Bit Computer like Atari 400, 800, Atari 810, Atari 1050
• Commodore C64, C16, C64C
• Commodore Amiga 500,500Plus, 600,1200
• Commodore CD32, Commodore 1541 II
• Neo Geo 5V Unit