Date   : Sat, 19 Apr 2008 11:06:49 +0100
From   : mike@... (Mike Tomlinson)
Subject: Reviving a dead BBC+

In article <7302029D805D4B40A0EA72FCEF2114F1@...>, Ken Lowe
<ken.lowe@...> writes

>Sorry for the delay in responding to everyone, and thanks Mike for the offer 
>of a replacement 6512.

NP.  Good to hear you got it going; just out of interest, did you feel
the RAM chips with the back of a finger to see if you could detect any
temperature differences?

>Next in line for replacement was the RAM. The B+ uses 8 off 120ns 4864s 
>(HM4864AP-12). I managed to find some 150ns 4864s (HM4864P-2) but I wasn't 
>sure if these would work.

4164s would have worked too.

>I intend to get hold of another 32K RAM chip and build a small circuit borad 
>that will hold both 32K RAM chips, and a single 32K ROM. This circuit board 
>will then plug into one of the existing ROM sockets, with flying leads to 
>the three external points highlighted above, and a fourth to pick up page 
>0/1 select. This should provide me with a fully expanded 128K B+ with all 
>ROM sockets still available.

Very nice :)  I'd like to see photos of that if possible.

cheers,
M.

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