Editing PERQ (section)

===PERQ 2===
The ''PERQ 2'' (codenamed ''Kristmas'' during development) was announced in 1983.<ref>[http://www.chilton-computing.org.uk/acd/sus/perq_history/part_5/c20.htm PERQ History: Part V: 20. ICL Manufacturing], Chilton Computing, UK.</ref> The PERQ 2 could be distinguished from the PERQ 1 by its wider, ICL-designed cabinet, with a lighter-coloured fascia, vertical floppy disk drive and three-digit diagnostic display.

The PERQ 2 used the same 16k WCS CPU as the PERQ 1A and had a 3-button [[computer mouse|mouse]] in place of the graphics tablet. It was configured with a quieter 8-inch 35 MB [[Micropolis Corporation]] 1201 hard disk, 1 or 2 MB of RAM and had the option of the PERQ 1's portrait monitor or a 19-inch, 1280×1024 landscape orientation monitor.<ref name="sus-vii-34">[http://www.chilton-computing.org.uk/acd/sus/perq_history/part_7/c34.htm PERQ History: Part VII: 34. Hardware], Chilton Computing, UK.</ref>

Due to manufacturing problems with the original 3RCC PERQ 2 (also known as the ''K1''), ICL revised the hardware design, resulting in the ''PERQ 2 T1'' (or ICL 8222).<ref name="sus-vii-34"/>

The later ''PERQ 2 T2'' (ICL 8223) and ''PERQ 2 T4'' models replaced the 8-inch hard disk with a 5¼-inch hard disk, which also allowed for a second disk to be installed internally.

The T4 model (of which only around 10 are thought to have been produced) had an extended 24-bit CPU and [[backplane]] bus, allowing the use of a 4MB RAM board.<ref name="hardware-faq"/><ref name="faq">[http://vonhagen.org/perq-gen-faq.html#I-33 PERQ FAQ, Rev. 7]</ref>

The PERQ 2 retained the PERQ 1's OIO slot, but replaced the IOB with either an EIO (Ethernet I/O) or NIO (Non-Ethernet I/O) boards. These were similar to the IOB, with the addition of a [[non-volatile]] [[real-time clock]], a second RS-232 port, and (on the EIO board) an Ethernet interface.