BDV11 (M8012-YA) weirdness

[Crawford]

Folks,

I have a BDV11 that I'm trying to figure out so I can get the latest ROMS on it using Lou's instructions. I read the EK-BDV11-TM-001_Mar78.pdf doc, but I'm missing something.

Challenge one is : where are the "W1-4" and "W9-12" jumpers? I see some zero ohm things above E35, but no markings. I can buzz them out but I thought I'd ask first.

Challenge 2 is: how the heck are the ROM sockets numbered?

I have figured out this:
E60-E55-E51-E47-E43-E39- Top row - These are marked (easy)
E??-E54-E50-E46-E42-E38
E??-E53-E49-E45-E41-E37
E??-E52-E48-E44-E40-E36 - Bottom row (above circuit card connectors)

So, the top (labeled slots) are 4 apart *except* for the leftmost one* which is 5 more than E55. So the leftmost column could be:
E60
E59
E58
E57

Which means there is no E56... which makes no sense.

Please set me straight...

 

[AK6DN]

See: http://bitsavers.trailing-edge.com/pdf/dec/qbus/MP00489_BDV11_Sep77.pdf page 3 for the board layout. E56 is an NE555 DIP-8 just above the D block of backplane pins. Other than that looks like you got the PROM layout correct.

The Wx jumpers you ask about are located just above E35, and on either side of E30, near the top of the board. Their locations are marked on the board layout mentioned above.

 

[Crawford]

Don,

Thanks. Couldn't locate the board info for some reason.

-Crawford

 

[Qbus]

Has anyone ever done anything with the additional storage space that’s available on this board? Not certain if it provides 2K or 16K of additional memory locations or what the story is with having to provide the -5 volt supply but would be fun to have something like DEC Basic in ROM and be able to load that directly, something like the old first generation IBM PC