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The A4000, or Commodore Amiga 4000, was the successor of the A2000 and A3000 computers. The machine came in two models, the A4000/030 and the A4000/040, with a Motorola 68EC030 or Motorola 68040 CPU, respectively. The A4000/040 was first out, released in October 1992. The A4000/030 was released in April 1993.
The A4000 came in a white desktop box with a separate keyboard. Later there was also a tower version called the A4000T.
Features of the desktop version:
- 2× front accessible 3½ inch drive bays.
- 1× front accessible 5¼ inch drive bay.
- 1× high density 3½ inch floppy disk drive.
- 2× internal 3½ inch drive mountings.
- AGA chipset.
- IDE disk interface.
Interestingly, unlike most other Amigas, early A4000 machines had the CPU mounted in a daughterboard using a special CPU slot. The mainboard had no CPU at all. Later machines had the CPU surface mounted on the mainboard in an effort to reduce costs. These machines were known as the A4000-CR (Cost Reduced) and the surface mounted CPU was a Motorola 68EC030. They also made use of a Lithium Ion backup battery rather than a NiCd. This backup battery is also one of the most common causes of problems in the aging A4000s: it has a tendency to eventually leak. The released fluids are somewhat corrosive and can eventually damage the motherboard.
One compromise of the A4000 was the use of PC-compatible memory. This resulted in memory access approximately 50% slower (given identical clock rates) as compared to the A3000.
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