On 04/02/2013 11:45 AM, Jules Richardson wrote:
seeing and reading about these Acorn machines. I'm an embedded
systems developer; I work with ARM processors (mostly ARM7) every day and
really like them. It's cool to see and learn about their heritage.
You might like this one - it's a first-generation ARM on an ISA card:
Oh my now that is awesome, isn't it. Great stuff!
I think that the 40-pin IC in the lower-right is a
standard Acorn Tube ULA,
with a bit of glue logic to marry it up to the ISA bus - although it's a
different animal to any of Acorn's other offerings of that era (e.g. it's not
just the ARM eval kit circuit in an ISA form-factor).
The firmware (I had the ROMs out for archiving when I took that photo) is
dated June of '87, which is the same time that the Archimedes was released to
the world; the board was most likely a way of attracting developers to the
platform by making it easy to run ARM code on a PC.
RAM is 4MB, I think, in 32 x 1Mbit parts.
I do have an ARM Evaluation Kit too (the ARM co-processor for the BBC micro),
along with another ARM-based ISA card (this time with a local I/O controller
and expansion connector).
Great stuff! Let me know if you ever want to part with anything early-ARM.
(I sure wouldn't if I were you, but I had to suggest it!)
Dave McGuire, AK4HZ
New Kensington, PA