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HP Forum Archive 19

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voyager R2D2 documents?
Message #1 Posted by uhmgawa on 17 Oct 2010, 3:32 a.m.

While experimenting with older voyagers I've been wondering if after 30 years something approximating an R2D2 data sheet may have surfaced somewhere. The evidence thus far tells me no, however it seems no harm in asking.

I'm aware of the brief data sheets for the individual hp-41c rom, ram, and display devices. And while useful to an extent, they obviously fall short of being an R2D2 reference.

Off-forum replies as well much appreciated.

Thanks!

      
Re: voyager R2D2 documents?
Message #2 Posted by Eric Smith on 18 Oct 2010, 3:51 p.m.,
in response to message #1 by uhmgawa

I had to reverse-engineer how the R2D2 works because I couldn't get any datasheet.

It's not a very complicated device.

            
Re: voyager R2D2 documents?
Message #3 Posted by Martin Pinckney on 18 Oct 2010, 4:15 p.m.,
in response to message #2 by Eric Smith

Couldn't you just ask 3-CPO?

            
Re: voyager R2D2 documents?
Message #4 Posted by uhmgawa on 19 Oct 2010, 11:27 p.m.,
in response to message #2 by Eric Smith

Quote:
I had to reverse-engineer how the R2D2 works because I couldn't get any datasheet.

Understood. But I figured it was worth asking on the remote chance some HP retiree happened on one in the attic. I'm still finding MOS Technology (who?) data sheets in mine.

Quote:
It's not a very complicated device.

From that required by the firmware programming model I'd agree. But this can easily gloss over subtle quirks, register access behavior, etc.. Driving the ISA bus directly via other than a NUT processor was my intention. A few weeks ago I cobbled together an ISA bus sniffer to capture rom images among other interesting data. Fairly trivial given the extremely slow bus speed even with modest bus data interpretation during acquisition. But it would still be useful to have electrical and timing specs for the device, even minimally so similar to the 41c ancient scrolls.

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