examples are owned by The National Museum of Computing. A680 Technical Publishing System Prototyped but unreleased, the A680 contained an ARM2 processor, 8 MB RAM, a 70 MB hard drive running from an onboard SCSI controller, and either a 40 MB cartridge tape drive or a single 2 MB floppy drive. Up to four "podule" expansion cards could be fitted, although one slot was occupied by the laser beam printer (LBP) expansion card supporting a directly-driven low-cost laser printer as an alternative to a PostScript printer connected via the serial port. The system was meant to run Frame Technology's FrameMaker under the "Acorn UNIX" operating system. To support 8 MB of RAM, dual memory controller (MEMC) units were employed. No other machine from Acorn Computers included integrated SCSI. However, it is rumoured that overheating from the SCSI controller was one reason for the machine to never be released. R140 Based on the A440/1, the R140 uses the same 8 MHz ARM2 processor and 4 MB RAM, also providing a 60 MB ST506 hard drive, with the option of adding a second hard drive using the same internal controller. A SCSI adaptor was available (priced at £299 plus VAT) for other storage peripherals. Since the hardware is based on the Archimedes series, Acorn's podule expansions could be added, although appropriate drivers would have needed to be written. At the time of initial release in 1989, the cost of the R140 was £3,500 for a standalone workstation without Ethernet connectivity. For the additional cost of the Ethernet expansion (£449 plus VAT), a network-capable workstation could be configured. A floating point expansion card based on the WE32206 could also be added (priced at £599 plus VAT). A discount introduced at the start of 1990 offered the R140 bundled with Ethernet expansion and either a 14-inch colour monitor with PC emulation software or a 19-inch monochrome monitor for £2999 plus VAT. Supplied with RISC OS 2 in ROM, the machine would boot that OS then could either automatically boot RISC iX totally removing RISC OS from memory or continue running RISC OSoptionally being rebooted into RISC iX at any time. An ordinary A440/1 with at least 4 MB RAM and a suitable hard drive could also run RISC iX. R260 Based on the A540, the R260 originally contained a 26 MHz, (later 33 MHz) ARM3 processor, 8 MB RAM (upgradable to 16 MB) SCSI