A4000 mainboard. rev.C

[wizard66]

Can anybody tell me the diference between a rev.B and a rev.C a4000 mainboard.
I can't find anything on the net.
On www.amiga-hardware.com it states that is rare mainboard but why ?
not many out there? is it younger as a rev B ?
Please can sombody give me any info about that. (sorry for my bad english dutch is my native)

[voxel]

If I remember well A4000 rev c motherboard have the 68030 soldered on it, a lithium battery instead of the leaking ni-cad one and chip memory soldered onboard. It's the very last motherboard ever manufactured by commodore (apart the ultra rare A4000T first run of course) :-)

Amigalement,
Jean-François voxel :-)

[DJBase]

@ voxel

Rev. D was the last version of the A4k board that was released. There exists also an Rev. E but was never finished.

[wizard66]

Originally Posted by voxel

If I remember well A4000 rev c motherboard have the 68030 soldered on it, a lithium battery instead of the leaking ni-cad one and chip memory soldered onboard. It's the very last motherboard ever manufactured by commodore (apart the ultra rare A4000T first run of course) :-)

Amigalement,
Jean-François voxel :-)

No Thats rev.D, lithium battery, i'm not that lucky there is a barrel battery installed.

source www.amiga-hardware.com

----- SNIP ----

Rev D motherboard differ slightly from the other versions and are dubbed "A4000-CR" which stands for "Cost Reduced". It was an attempt to reduce the cost of manufacturing the A4000. Most A4000's were shipped with a separate processor card connected to the CPU fast slot however the A4000-CR had an 030 soldered directly to the motherboard therefore a processor card was not required. It still contained the CPU fast slot however for attaching accelerators. In addition to this Commodore also removed the fifth SIMM slot which is reserved for CHIP ram and soldered the CHIP directly to the motherboard. As all A4000s were supplied with 2MB CHIP by default, the fifth SIMM slot was rather useless because the AGA chipset could not address more than 2MB of CHIP. Commodore had planned to give the A4000 the ability to address up to 8MB of CHIP and indeed a jumper can be found on the motherboard which would have been used for this purpose, but the jumper actually does nothing.

--- SNAP -----

But no info about rev.c it only states (RARE)

Rev 1 (Early prototype, with black case)
Rev B (Most Common)
Rev C (Rare)
Rev D (A4000-CR)

same source

[voxel]

ouch! fortunely I said "if I remember well" ;-)

[wizard66]

Originally Posted by voxel

ouch! fortunely I said "if I remember well" ;-)

No harm done but thanks anyway, sombody else have a clue ?

[Paul]

This thread just reminded me about updating the BBoAH FAQ link
http://hardware.amigafuture.de/