Machine Name : IBM XT
Processor : Intel 8088 at 4.77MHz
Memory : Up to 256k on motherboard, 640K on expansion cards.
Backing Store : Cassette, none.
Floppy Disk, 1x360K 5.25"
Hard disk, 10Mb MFM.
Firmware : BIOS, Cassette Basic.
Screen : Dependant on graphics adapter:
Text 40x25x16, 80x25x16, CGA, 80x25x2 MDA.
Graphics up to 640x200x2 CGA, none MDA.
Other I/O : IBM XT Keyboard.
Standard IBM PC 8 bit expansion bus (8 slots
some already filled). most of the stuff listed
below was optional !
Serial card
Paralell card
External Floppy disk (on back of floppy controler).
Various other boards from third party manufacturers.
IBM's successor to the hugely successfull PC, again based around the Intel 8088 processor. This machine had the advantage of a motherboard that would take 256K of memory (as opposed to the PC's 64K), and had more free expansion slots (8 in total). The basic configuration for the machine was a single disk machine with monochrome graphics. Though the most common seems to have been the colour graphics version with the 10Mb hard disk. My example was manufatctured in 1985, and has been expanded to the full 640K, and has an additional 20Mb hard drive fitted. As witl all my PC type machines this has an ethernet network card fitted. It is interesting to note that this machine still has the original hard disk !
Machine Name : IBM AT
Processor : 80286 at 6MHz (8MHz on later models).
Memory : 512k on motherboard, extra 128K on expansion card.
Backing Store : Cassette none.
Floppy Disk, 1.2Mb 5.25"
Hard disk, 20Mb MFM, optional 40Mb MFM.
Firmware : BIOS, Cassette basic.
Screen : Dependant on graphics adapter:
Text 40x25x16, 80x25x16, CGA, 80x25x2 MDA.
Graphics up to 640x200x2 CGA, none MDA.
Other I/O : IBM AT keyboard.
8 IBM expansion slots (5 of them 16 bit).
Most of the below where optional.
Serial card.
Paralell card.
Varios add on options from third party manufacturers.
The AT was IBM's successor to the XT, though sold concurrently and aimed more at the 'power user' who needed more performance than the XT could offer. The machine was typically used for applications such as computer aided design and as a network fileserver (running anoperating system such as Xenix, a Unix variant). My machine was rescued in pieces from a frined who had cnabalised it, and has now been restored to working order. I have expanded the memory to 4.5Mb using third party expansion cards, and as standard for PC type machines I have added an etherenet network card. >
Back to Phill's Computer Museum.
Disclaimer, all views expressed here are my own and do not represent the views of Demon Internet !