An Acorn 4000 checks in

On 03/31/2013 02:32 PM, Dave McGuire wrote: You might like this one - it's a first-generation ARM on an ISA card: http://www.patooie.com/temp/armappisa.jpg 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). cheers Jules