Apple this morning improved its iBook, introducing faster processors across its consumer portable line-up.

The company, which sold 133,000 iBooks in its March quarter, has introduced 900MHz G3 processors into all iBooks, with the exception of the 12.1-inch entry-level model, which houses an 800MHz processor. Pricing for all models is unchanged.

The entry level model also benefits from an ATI Mobility Radeon 7500 graphics card with 32MB RAM. This model previously carried just 16MB of RAM.

Hard-drive sizes have also been tweaked. The entry-level iBook now carries a 30GB drive, rather then the 20GB disc of old. The 12.1-inch Combo drive iBook now has a 40GB drive - an extra 10GB - while the 14.1-inch iBook carries a 40GB drive. The 14.1-inch high-end iBook is equipped with a 60GB drive.

Apple's iBooks ship with iMovie, iTunes and iPhoto, as well as the World Book Encyclopedia, AppleWorks, Mac OS X Chess, OttoMatic, Deimos Rising, FAXstf, PixelNhance and Acrobat Reader.

Features by model are as follows. All prices include VAT:

12.1-inch CD-ROM iBook (£799) 800MHz PowerPC G3; 512K L2 cache (at 800MHz)
128MB SDRAM memory; 30GB Ultra ATA drive; CD-ROM drive; ATI Mobility Radeon 7500; 32MB video memory; 10/100Base-T Ethernet; 56K internal modem; AirPort-ready.

12.1-inch Combo iBook (£1,049) 900MHz PowerPC G3; 512K L2 cache (at 900MHz); 128MB SDRAM memory; 40GB Ultra ATA drive; DVD/CD-RW drive; Mobility Radeon 7500; video memory' 10/100Base-T Ethernet; 56K internal modem; AirPort-ready.

14.1-inch Combo (£1,199) 900MHz PowerPC G3; 512K L2 cache (at 900MHz); 256MB SDRAM memory; 40GB Ultra ATA drive; DVD/CD-RW drive; ATI Mobility Radeon 7500; 32MB video memory; 10/100Base-T Ethernet; 56K internal modem; AirPort-ready.

14.1-inch Combo+ (£1,478; available from Apple Store or as build-to-order configuration from authorized dealers)
900MHz PowerPC G3; 512K L2 cache (at 900MHz); 384MB SDRAM memory; 60GB Ultra ATA drive; DVD/CD-RW drive; ATI Mobility Radeon 7500; 32MB video memory; 10/100Base-T Ethernet; 56K internal modem; AirPort-ready.