Best 1200 revisions?

[Akiko]

Okay my 1200 has just died with black screen of death! My spare has a broken PCMCIA slot so I'm basically screwed until I find another. I have heard in past some revisions have timing issues? What revisions should I be looking for that won't cause issues with my BPPC card. thanks..  :-)

[r-tea]

I had 14D revision and had some problems with BPPC, but to be honest, I didn't do too many attempts to find out which part causes those problems for real.
On the other hand I have heard that 14D is one of the best A1200 revisions. Maybe it's because this one is one of the latest?

[Brian]

All A1200 motherboards had timing issues though some late 1D1's was corrected in factory before being shipped if I'm not mistaking.

Timing fix "hack" for Rev1D4 and Rev2 can be found on AmiNet.

[Matt_H]

1D4 and 2B supposedly have "timing problems" which can cause problems with multiple expansions attached. I haven't heard of any problems with other revisions.

1A and 1B have additional clockport pins, so make sure to connect the correct ones if you use clockport peripherials. The revisions are very uncommon, however.

[FrankBrana]

I have a 1D4 revision, from one "recent" ( in amiga temporal terms ) batch, running with bppc rev0 ( which is known to be the most problematic one ) and I have had zero timming issues or strange lockups, etc.

Anyway, in tha page of ian stedman, is a guide of how to do the timming fixes to the 1200 mobbos, depending of the revision.

Tell he google "amiga ian stedman" and follow the rabbit

[jj]

well I have a 1A not had any problems wth timing issues.  And yes they are rare

[PG]

There is an excellent support page from eyetech explaining the problem with some mainboard revisions:

Mainboard revisions

In addition to that i think that there are different revisions of the chips also.
This is only my speculations but i have had problems when repairing mainboards.
For example a perfectly working Gayle on one mainboard didnt work with another mainboard until i replaced the Alice chip also...

It could also explain why some people have problems and others have no problem with the same revision.
Everything would have been so much easier if they just had fixed the chipset instead of the mainboard workarounds..:-)

[PG]

JJ wrote:
well I have a 1A not had any problems wth timing issues.  And yes they are rare

AAhhh..congratulations... :-)
I have also a 1A mainboard in one of my test computers and  its the absolutelly best revision in my opinion.
Its good to have for testing hardware..:-)

[jj]

never had any real issues, and got a Z4 busboard hanging off it, plus 040/25 603e 175

got my a1200 from currys in uk when they were released. was the sleepwalker pack

was supprised when i towered it that is was 1a

[Akiko]

Ok thanks guys :-) I will try avoid the 1D4 and 2B revisions!
My spare 1B board has this wire coming from the Budgie chip so I presume that it's been fixed. Unfortunatly it's last owner bust the PCMCIA slot :-(

[x56h34]

According to the Eyetech page, 1.D.1 is the revision to get.

[Colani1200]

Those hardware bugs are really an annoying part of AMIGA history. I don't want to know how many people left AMIGA because of having strange problems, lockups and thelike that were simply related to the revision of their hardware. I know at least one person who did so. Nowadays, at least you have the possibility to learn about these bugs (websites, forums etc.) and fix them, but remember how comparably limited possibilities were when AMIGA had its prime time...  :-(