The R260 is functionally identical to the A540. The R260 was fitted with 8 Mb of RAM and a 100 Mb SCSI hard disc drive as standard, while the R225 came with 4 Mb of RAM and no hard drive, and was intended as a cheap networked UNIX workstation. Both machines were supplied with ARM3 chips and built-in Ethernet interfaces.
Serial Number 01-UNX26-1000145
CPU Type ARM3
CPU Model VL86C020-PSGCP
CPU Clock 30MHz
Memory controller MEMC1a
Memory 16MB
Video controller VIDC1a
Hard Disc controller SCSI
Thanks to http://acorn.chriswhy.co.uk/ for the information