RK8E controller board revisions - Chaos ahead, help needed
ak6dn at mindspring.com
Mon Apr 26 15:03:23 CDT 2010
Check out the PDP-8e ECO log document on bitsavers.org:
Pages 313-315 have details on the M7104-6 modules
On 4/26/2010 12:02 PM, Philipp Hachtmann wrote:
>> The B2, B1, and C are the etch levels of the boards. The 310D means the
>> board was made in 1973 or maybe 1983 during the 10th week. The D is the
>> eco/fco rev of the board.
> Ok, etch level is somewhat clear to me - it's marked in copper. And
> the eco/fco stuff - how to keep track of that? And what stands the D
> really for? A combination of board revision and eco level?
> I'd like to know how to get the right schematic etc.
> In the RK8E schematics for example I read "revision a" for the board.
> Does that refer to the etch revision or the overall version of the
> board including ecos and probably applied fcos?
> Is there some kind of straightforward record of eco and fco levels?
> What about the relationship between factory installed ecos and fcos?
> Are they equivalent?
> To me it's all not that clear...
>> I still have some other thing to go over with you off list, and will
>> try to
>> get to them this week.
>> On Mon, Apr 26, 2010 at 7:51 AM, Philipp Hachtmann <hachti at hachti.de>
>>> Hi folks,
>>> I'm currently dealing with some RK8E Omnibus RK05 controller board
>>> I was unable to assemble even one stable RK8E from the stuff. I
>>> assume a
>>> high failure rate. But I also assume that I have board revision
>>> I've been told that several revisions existed. And that there were
>>> compatibility issues and some kind of paper (which I do not have)
>>> what fits what.
>>> I don't even know if the revisions are PCB revisions like "M7104 B2"
>>> written in the etch or if there are also FCOs or alike that make
>>> boards with
>>> same etch incompatible to other boards.
>>> My personal RK8E passes all tests. It consists of:
>>> M7104 B2
>>> M7105 B1
>>> M7106 C
>>> But I have other boards flying around here as well.
>>> Do stamps like "310 D" on the backside of the boards have any
>>> meaning with
>>> respect to board revision or FCO level?
>>> Another question is how to get different board revisions associated
>>> the right schematics.
>>> I strongly appreciate any piece of enlightenment since I'm currently
>>> getting depressed by that stuff. Even if I have bad boards - it
>>> won't make
>>> sense to try to repair something if the whole is inconsistent in
>>> Many thanks,
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