4.3BSD Quasijarus

[Guy Sotomayor]

On Dec 28, 2008, at 1:07 PM, Dave McGuire wrote:

> On Dec 27, 2008, at 4:29 PM, Johnny Billquist wrote:
>> Nope. The MK-11 memory box for the 11/70 (there are others) have  
>> the same memory bus as the 11/750, but the MK-11 don't support 1MB  
>> boards. Believe me, I know...
>> 256 KB memory boards works fine in both MK-11 and 11/750 though.
>>
>> And if someone *really* have 1MB boards, and an MK-11, and wants to  
>> use them, contact me and I can start explaining what you need to do  
>> to actually get it to work. But it requires both serious hardware  
>> hacking and software fiddling.
>
>  I must admit, I find the idea interesting!  1MB boards do show up  
> from time to time, and my 11/70 could definitely use more memory. :)

The easiest thing to do would be to replicate a PEP-70.  It's fairly  
easy as it would be one hex board with all of the memory.  The only  
modification needed for the 11/70 is 4 power jumpers to slot 19.  Then  
just route short cables from the cache boards to the new board rather  
than to the external memory boxes.  I wouldn't run an 11/70 any other  
way.  :-)