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O > OLIVETTI  > M24     


Olivetti
M24

This is a highly IBM PC compatible system. It means that it is truely hardware and sotfware compatible with the IBM PC of that time. Back then, all "PC compatible" systems were not exactly 100% compatible... so it was a real marketing argument for the Olivetti M24.
There were two true tests to know if a system was really IBM PC compatible : Lotus 1-2-3 and Microsoft Flight Simulator, and the M-24 was running both with no problem.

But in addition to its good compatibility, the Olivetti M24 was offering more than the IBM PC itself : RS232c and Centronics interface built-in, more complete keyboard, better graphic possibilities (640 x 400) and 7 free expansion slots (instead of 3 for the IBM PC). Even the CPU (8086, real 16-bit) was faster than the 8088 (16-bit with an 8-bit bus) used by the IBM PC.

It runs under MS-DOS 2.11, CP/M 86, UCSD P-System and even PCOS, the Olivetti OS used on the M20.
The 128k RAM can be expanded to 256k or 640k by adding memory directly onboard. It is also possible to connect two optional 10 Mb hard disks (one internal and one external).
The Olivetti M24 was sold with a green or yellow phosphore 12" monochrome monitor, or with a color monitor (more expensive, of course). Two keyboards were available : one absolutly identical to the IBM PC's, and an Olivetti with more keys (102 instead of 83) including 18 functions keys and a complete editing keypad.

In September 85 appears a new model, the M24 SP. It is based on a M24 but its Intel 8086 is running at 10 Mhz, it has 512k RAM (still upgradable to 640k) and a 20Mb hard-disk.

Conclusion : the Olivetti M24 was the first computer to be fully compatible with the IBM PC and to offer more features than original PC, for a cheaper price !

The Olivetti M24 was also sold as the Logabax 1600 in France (Olivetti owned Logabax) and the ATT PC-6300in the USA (Olivetti signed a distribution deal with ATT). As Olivetti was not entirely satisfied with the ATT deal, it also approached Xerox to distribute its computers in the USA.



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In 1996 I received one of these from my high school as they had no use for them. They got them through the Federal govt.''s Computers for schools program. They were previously used by our revenue $ taxation department. It was a pretty good PC, had two 360k floppy drives. U upgraded it with a 20mb MFM hard drive $ controller card as well as a 2400 bps Modem. The HDD had only 10 mb useable as it had some bad sectors. It ram MS-Dos 6.22 very well indeed. Used Word Perfect 5.1 on it $ of course terminal emulation to visit local bulletin board services. Those were the days!

          
Friday 12th July 2013
Patrick Ashbee (Canada)

In the late eighties the Finnish magazine Mikrobitti was benchmarking the IBM compatible machines they tested with a self-written benchmark utility. The 4mhz IBM PC was used as a baseline with a score of 1.00. I notice that in the December 1988 issue the Olivetti M24 is listed as the fastest tested computer up to that point with a score of 2,86! Next entries are Toshiba T1200, Amstrad PPC 640, another Amstrad, Microgem MIC-4, Schneider EuroPC, etc.

          
Saturday 15th September 2012
IL (Finland)

The screen also was available with white phosphor and the monochrome versions were powered through the signal cable - no separate power cable.

One feature, important at the time was that your could remove the top cover in the normal way to $ expansion cards. You could also remove the bottom cover which gave access to the mother, mounted "upside down" and connected to the separate expansion board backplane with a cable that passed through a slot in the metal separating the upper and lower compartments. This meant that motherboard upgrades did not require you to remove the expansion cards. I was never convinced of the utility of this and it was $ped after being used in the M28 (the 80286 successor to the M24).

There was also a socket on the motherboard that accepted an 8250 (if I recall correctly) that allowed synchronous serial connections. I never ever saw it used.

There were two models of keyboard. One conventionally had 10 function keys at the left-hand side. The other had nineteen across the top: used for proprietary applications such as OliWord.

          
Wednesday 23rd May 2012
Nicole (UK)

 

NAME  M24
MANUFACTURER  Olivetti
TYPE  Professional Computer
ORIGIN  Italy
YEAR  1984
BUILT IN LANGUAGE  MS-DOS and GW-Basic delivered on disks
KEYBOARD  Separated full-stroke keyboard, 102 keys, numeric keypad, 18 function keys
A standard IBM keyboard (83 keys) was also proposed
CPU  Intel 8086
SPEED  8 MHz
CO-PROCESSOR  optional 8087 arithmetic co-processor, NEC 6845 video generator
RAM  128 Kb (up to 640 Kb)
VRAM  40 / 80 x 25
ROM  16 Kb
TEXT MODES  40 x 25, 80 x 25
GRAPHIC MODES  320 x 200 with 4 colors / 640 x 200 monochrom / 640 x 400 monochrom
COLOrsc  16
SOUND  Tone Generator
SIZE / WEIGHT  16 x 38 x 37 cm
I/O PORTS  Centronics, RS232c, mouse, keyboard
BUILT IN MEDIA  One or Two 5.25'' disk-drives (360k or 720k), optional 10 Mb hard-disks
OS  MS DOS 2.1, Concurrent CP/M 86, UCSD-P, PCOS
POWER SUPPLY  Built-in PSU, 135w
PERIPHERALS  Hard-disk, IEEE 488, RS 422, RS 232, PC Net boards, IBM 3278 coaxial network board, mouse
PRICE  2 disk-drives system : 3535 (France, 84)
color monitor, 10 Mb hard-disk : 8250 (France, 85)





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