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PostPosted: Wed Oct 19, 2005 3:58 pm 
8086
8086

Joined: Sat Jan 29, 2005 1:45 pm
Posts: 54
Location: Boston
no i meant on thwe thing Is aid earlier


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PostPosted: Wed Oct 19, 2005 4:22 pm 
King of All Voodoo2 Cards
King of All Voodoo2 Cards
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Joined: Tue Jun 22, 2004 10:41 am
Posts: 9316
The AT specifications? It's all on page 35 of Scott Mueller's Upgrading and repairing PCs.

In case you don't have the book here's what it says:


Table 2.3 Differences Between PC/XT and AT Systems

System Attributes: (8-bit) PC/XT Type

Supported Processors: All x86 or x88
Processor Modes: Real
Software Supported: 16-bit Only
Bus Slot Width: 8-Bit
Slot Type: ISA only
Hardware Interrupts: 8 (6 Usable)
DMA Channels: 4 (3 Usable)
Maximum RAM: 1MB
Floppy Controller Speed: 250Kbps
Standard Boot Drive: 360K or 720K
Keyboard Interface: Unidirectional
CMOS: None Standard
Serial Port UART: 8250B


System Attributes: (16/32/64-Bit) AT Type

Supported Processors: 286 or Higher
Processor Modes: Real/Protected/Virtual Real
Software Supported: 16 or 32-bit
Bus Slot Width: 16/32/64-Bit
Slot Type: ISA, EISA, MCA, PCMCIA, CardBus, ExpressCard, VESA Local Bus, PCI, PCI Express, AGP
Hardware Interrupts: 16 (11 Usable)
DMA Channels: 8 (7 Usable)
Maximum RAM: 16MB/4GB or More
Floppy Controller Speed: 250/300/500/1,000Kbps
Standard Boot Drive: 1.2MB/1.44MB/2.88MB
Keyboard Interface: BiDirectional
CMOS: MC146818 Compatible
Serial Port UART: 16450/16550A or Greater


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