Commodore has jumpted aboard the bandwagon and produced two IBM-compatible machines. It doesn't claim 100 per cent compatibility, only that the hundreds of programs it has tried ran without any problems. Both machines are built around the 8088 16-bit processor and have 256K RAM expandable to 640K. The PC10, priced at £1,675, comes with two 5.25in disk drives while the PC20 has one 5.25in disk and a 10 Mb hard disk. Priced at only £2,795 this is probably the cheapest hard disk PC compatible machine on the market. The machines should be arriving at Commodore dealers now.