A2200 (A1000jr)
 connects to: Other
Motherboard - closeup
Motherboard - closeup
Motherboard - closeup
Motherboard - back
Motherboard and riser card
Riser card - back
Riser card- closeup
Board config
Hi Res version, Motherboard
- 3264 x 1840, 2,044K
Hi Res version, Riser card - back
- 3264 x 1840, 1,852K
Hi Res version, Board config
- 3264 x 1840, 1,986K
Hi Res version, Sysinfo
- 3264 x 1840, 2,428K
Hi Res version, Sysinfo
- 3264 x 1840, 2,059K
Hi Res version, Sysinfo
- 3264 x 1840, 2,013K

a Commodore Amiga 2200 motherboard, Rev 1 along with an A2400 daughter (riser) board Rev 0.0. The board runs good enough to boot workbench 3.1. Below are some notes about this unique system (images used with kind permission from www.computerpreservation.com):

  • The A4000 form factor (i.e. case) was based off of this design. This board will fit into an A4000 case and will use an A4000 power supply. Keyboard connector appears the same as an A4000, but was not tested.
  • The ROMs appear to be standard A4000 V3.0 types. Not sure that these are the original ROMs, but seems reasonable given the similarity between the two machines.
  • The riser came in the same lot, but not the same box as the motherboard. Uncertain if it goes with the motherboard. However the A2400 (a 4-slot 2200) designation would seem to indicate that it is the proper one. The riser mechanically fits perfectly in the motherboard. System was tested without the riser installed to reduce the risk of any damage.
  • Battery is still attached and doesn’t appear to have leaked.
  • Board has 1MB of Chip RAM soldered on board with a 72-pin SIMM slot to expand.
  • Board has a 25mhz 68020 and 68882 on-board with an A3000/A4000 style fast-slot for expansion.

A few months after the cancellation of the A1000+ and A3000+ it was decided the company should attempt to salvage the A1000+ technology and build a lower spec ECS-based machine. The project was developed under the codename 'A1000jr', an unofficial title intended to annoy Bill Sydnes.

 In an e-mail exchange, Dave Haynie commented on one of the changes made to the A1000jr design:

"They did the backplanes 2-layer, and when I pointed out that Zorro III didn't run on a 2-layer backplane, they disabled Zorro III mode, so these were Zorro-II only."

After months of development four configurations were produced for the mid-range market. These would fit between the A500 and A3000 in the Commodore product line.

Model CPU Number of Zorro II slots
A2200 68020 2
A2400 4
A3200 68030 2
A3400 4

The finished products were production-worthy, but were never ordered by a sales company within Commodore. In an attempt to recoup the cost of development, Commodore reused the case design for the A4000 a year later, and upgraded the A1000Jr configuration into the A3200.

Page contributors: Amiga history guide, Jan Pedersen, Steen Jessen
Updated: 2/6/2016 . Added: 2/6/2016