EPOX AMD Socket et A Processor based AGP (8X) mainboard Dokumentacja Pobierz pdf (Strona 105)

Computer Architecture and Maintenance (G-Scheme-2014)

Table . Differences Between PC/XT and AT Systems

System Attributes

PC/XT Type 8-Bit 16-, 32-, 64-Bit AT Type

DMA channels 4 (3 usable) 8 (7 usable)

Maximum RAM 1MB 16MB/4GB[1] or more

Floppy controller speed 250Kbps 250, 300, 500, and 1000Kbps

Standard boot drive 360KB or

720KB

1.2M, 1.44MB, and 2.88MB

Keyboard interface Unidirectional Bidirectional

CMOS memory/clock None

standard

MC146818-compatible

Serial-port UART 8250B 16450/16550A or better

Prepared By – Prof. Manoj.kavedia (9860174297 – 9324258878 ) (www.kavediasir.yolasite.com)

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EPOX AMD Socket et A Processor based AGP (8X) mainboard Dokumentacja Strona 105