Amiga 4000 motherboard

[Sanxion]

Hi all

In addition to the power supply, what else is required in order for a complete motherboard to function?

[ajk]

Chip RAM, if it's not soldered on-board.

[Sanxion]

I was told:
zorro daughterboard ( or a mediator ) and an acceleratorboard ( a3640, cyberstorm, .... )

Is that not correct?

[spudje]

Daughterboard is not required. I believe an A3000 does need a daughterboard to work but an a4000 does not.

[Jope]

If the main board has no onboard CPU, you will need a CPU card too. The zorro riser is optional in the A4000.

[Signman]

I was just reading 4000 manual and it states that daughterboard needs to be installed to run.

[amigasith]

Originally Posted by Signman

I was just reading 4000 manual and it states that daughterboard needs to be installed to run.

Hmm... I never came across this. I just checked the German version of the A4000D manual and it also says that the daughterboard is "...required for proper operation". But this is definitely not true

When I fixed a battery leak on an A4000D motherboard, I ran a ton of tests without the daughterboard connected and everything just worked perfectly. Many other people reported the same by the way - both here and over on a1k.org. The only big box Amiga that is known not to work when the daughterboard is missing is the A3000.

[ElectroBlaster]

I have two A4000 Rev. B boards here, one is spotless and 100% perfect, the other has been treated badly by the previous owner and needs reworking. I need to test this fully before I do anything else.

I was going to ask the same questions but this post has answered it all for me

[Chucky]

zorroboard is NOT required. is a rev2/B cpuboard is reqquired and chipmem..
(and roms )

if rev D-CR, cpu is on the motherboard. so cpuboard not needed.


End of discussion
(as this is how I test boards I get for recap/repair etc)

[grelbfarlk]

Originally Posted by Chucky

zorroboard is NOT required. is a rev2/B cpuboard is reqquired and chipmem..
(and roms )

if rev D-CR, cpu is on the motherboard. so cpuboard not needed.


End of discussion
(as this is how I test boards I get for recap/repair etc)

Obviously Chucky knows what he is talking about, but just to repeat the point, Zorro busboard does not need to be installed. Buster has to be installed 9 or 11 (maybe 7?). And ROMS! Maybe a list of what can be totally removed would be helpful too. RTC can be removed as well as chip right next to the RTC and battery U177.