Re: Shark memory map?

On Sun, Sep 14, 2025 at 02:12:32PM -0400, Mouse wrote:
> I've got a shark.  It works fine.
> 
> But I've got only one, so I'd like to insulate myself against it
> breaking.
> 
> So, I figured, I'd build an emulator while it still works and I thus
> have something to compare against.  But that means I need more detailed
> info.
> 
> I've got EC-R8JLB-TE, the user guide.  It helps some.  I probably can
> figure out a lot by experimenting; I did find a note in the user guide
> (page 4-12) which implies that the ROM exists based at 0x8a000000 but
> there is a PAL in the address path which effectively ORs 0x8a000000
> into the address lines for the sake of early startup, so that would be
> an interesting place to start looking.
> 
> But I thought I'd ask here first to see if anyone can point me at a
> document already written that describes the memory map and such.
> Presumably something of the sort existed once upon a time - DEC could
> hardly have built it without one - but that's not to say that any
> copies made it out to the public, nor for that matter than any copies
> still exist.

Somewhere there's schematics, and source code for the PAL array:

https://web.archive.org/web/20030709053758/http://research.compaq.com/SRC/iag/info/dnaext/dnard/pal

https://web.archive.org/web/20030730062843/http://research.compaq.com/SRC/iag/info/dnaext/hardrev5.html

https://web.archive.org/web/20030626074859/http://www.research.compaq.com/SRC/iag/info/new-hard.html