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I > IBM  > PC XT - Model 5160     


IBM
PC XT - Model 5160

The IBM PC XT is the successor of the IBM PC. The XT stands for EXtended Technology and was introduced in early 1983. It has enhanced features: CGA graphic card, hard disk, more memory, and no more tape port (!). But it wasn't very innovative.

There are in fact two versions of the XT motherboard. The first one can accept from 64k to 256k RAM, whereas the later one has support for 640K RAM max, the 101-key keyboard, a 3.5'' FDD and a few other details...

In addiditon to the removal of the cassette port, the XT also had eight 8-bit ISA expansion slots VS the PC's five. The XT's slots were also positioned closer together, the same spacing all PCs still use today. This made old PC's totally worthless because you couldn't buy an XT clone board and drop it into a PC case. Eight slots was a huge boon to the "power user" who had previously found himself having to pick and choose what upgrades to install in the paltry five slots of the PC.

The 5160 was replaced with the PC XT S (20 MB Hard disk, slim size floppy disk unit, 640 KB RAM), then with the PC XT 286.

Richard Warr reports:
This was the machine that launched my career as a software consultant. I spent months programming Supercalc II spreadsheets on a 128k model before we got the go-ahead to upgrade to a massive 256k and run Lotus 1-2-3! Although the original system board was supposed to take only 256k it was possible to overcome this by installing a multiplexer and soldering a couple of jumper cables, allowing use of 256k chips instead of 64k ones. I actually did this to a machine owned by General Electric and got the RAM up to 640k. When you did run out of slots you could buy an expansion unit which looked just the same as the base. As just about every function required a card this was often necessary.

There was a version of this machine called the 3270PC, especially designed to emulate a mainframe terminal. In 1985 I made a decision to buy a couple of these in preference to the new ATs. We'd never need the extra speed offered by a 6MHz machine(!). Fortunately I kept my job.


About expansion abilities, Derek Brewer specifies:
The IBM XT could, with the color monitor, be upgraded to the later EGA graphics card. The system can also, with a controller board upgrade and IBM DOS 3.30, be fitted with a 20-30Mb Hard Disk. The only limitation is when upgrading to EGA the system will only recognize a card with less than 32kb of VRAM.

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I bilt my first computer whith a 8080 famely whith tineybasic on the chip and used a radio shack wire warp gun and goog old BITE magzine now i desing hvac system for seafood plants :))

          
Monday 4th November 2013
Dr-D

sure miss thos days i had a 30 mb rodine hd lol
I put ibm basic on rom,s and then added the letters ibm in the bios so the clones whoud run ibs softwear
miss thoes days

          
Monday 4th November 2013
Dr-D

back then my ibmpc had 640 mem 10 mzh mother board

          
Monday 4th November 2013
Dr-D (usa)

 

NAME  PC XT - Model 5160
MANUFACTURER  IBM
TYPE  Professional Computer
ORIGIN  U.S.A.
YEAR  1983
END OF PRODUCTION  Unknown
BUILT IN LANGUAGE  Microsoft BASIC
KEYBOARD  Full-stroke keyboard with numeric keypad and function keys
84 or 101 keys
CPU  Intel 8088
SPEED  4.77 MHz
CO-PROCESSOR  Socket for a 8087 math co-processor
RAM  From 64k to 640k, depending on models
ROM  64 kb
TEXT MODES  80 x 24 / 40 x 24
GRAPHIC MODES  CGA modes : 320 x 200 / 640 x 200
COLOrsc  16
SOUND  Tone Generator
I/O PORTS  eight internal slots (five 8 bit ISA), RS232c, Centronics
BUILT IN MEDIA  One 5.25'' FDD, 360k (3.5'' on later models)
10Mb or 20Mb hard-disk
OS  MS DOS
POWER SUPPLY  PSU built-in
PERIPHERALS  Numerous IBM and third-parties expansion cards, i.e. the QuadRam 512 KB RAM card
PRICE  $8000 (Complete version with 640 KB RAM, 10 MB HDD, colour display)





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