Olivetti M24-SP

Although not the m24-sp the xerox shown in the pictures are the same computer. olivetti licensed the system to at&t and xerox so they could have their name on it. From what I know the xerox I have is the rarer of the 3 systems. Please click on the photos below for a much larger version (most over 300k). The numbers under each photo is the size of the larger version.

General settings

(Number in cell with picture tells which jumper block is shown)

256k memory chips not used. 0
256k memory chips used 0
Coprocessor not installed 0
Coprocessor installed 0
UART type 8250 0
UART type 8530 0
BIOS type 2732 (M24 only) 0
BIOS type 2764 (M24 only) 0
No memory installed in Bank 0 (M24SP only)
Memory installed in Bank 0 (M24SP only)
Floppy drive tracks per inch select 48 (320KB drive)
Floppy drive tracks per inch select 96 (640KB drive)
Floppy drive start up speed select slow 1
Floppy drive start up speed select fast
HDU ROM code select on mainboard
HDU ROM code select on controller
Display controller select standard
Display controller select non standard


128k 0
256k 0
384k 0
512k(all ram on motherboard) 0
512k(some ram on an expansion card + rest on motherboard) 0
640k 0
640k(all ram on the motherboard) 0


B&W /monochrome display 1
cga 40X25 1
CGA 80X25 1

Floppy drives

One Floppy drive 1
Two floppy drives 1




As you can see from this photo the M24-SP is a fairly standard looking computer. What can't be seen is just how odd it really is. One thing in this photo which clues you in that it's no standard pc is the fan clearly visible in the back (off centered to the right).

Olivetti decided not to stick with any kind of standard when building this system and went with a strange dual motherboard design. The upper section contained the isa expansion slots and the lower section contained everything else. Both were connected through the video card which made upgrades impossible.



In this picture you can see the upper motherboard. It contained the 8-bit expansion cards. Two of the slots have an odd 16-bit slot which as far as I know only Olivetti used.

Another thing visible is the power connectors(red/black cables with yellow connectors). Notice how big they are and how they are bolted to the motherboard. That yellow curved thing on the left side of the photo is just a sticker which is pealing off.


Here is the main motherboard. Visible here is the amd 8086-2 processor and the 640k of ram. Also visible are the two block of switches. Even for it's day it had a lot of chips.


If you compare the diagram above with this photo you can see they are the same system.