The machine was named Quattro as it supported up to four users, each user running up to four programs simultaneously.
Internal hardware design was quite similar as the Personal Computer's. An eight connector backplane supporting logic boards. However, the CPU board featured a 16 bit 8086-2 and up to 1 MB of RAM could be installed.
Thre models were available: Model 19 with 256 KB RAM and 2 x 5" 800 KB floppy drive, Model 39 with 512 KB of RAM, one floppy drive and one 10 MB hard disk, Model 49 same as Model 39 but with a 20 MB hard disk.
The Quattro could work with wirtually any video terminal. ICL supplied its own monochrome (6402G) and colour (6404G) graphic versions along with a 102 key keyboard.
It was delivered with Concurrent CP/M Operating System, later called Concurrent DOS, a true multi-tasking, multi-user O.S. which offered a very limited compatibility with MS-DOS.
Sadly, few major software of the time, running on the first IBM PC and clones, were adapted to the specific features of the ICL. This is the main reason why the Quattro didn't meet any success, except near some corporate customers who already used ICL mainframes.
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BUILT IN LANGUAGE
Full stroke 102 key with function and arrow keys and numeric keypad
Socket for 8087 math coprocessor
From 128 KB to 1 MB
80 chars x 25 lines
640 x 400 dots (ICL terminals)
Monochrome or 8 colours
SIZE / WEIGHT
6 x serial RS232 ports, custom serial port, RS422 port, RGB port
BUILT IN MEDIA
1 or 2 x 5.25'' 800 KB floppy drives, 10 or 20 MB hard disk
Concurrent CP/M V.3.1
Built in switching power supply unit
RAM expansion, 2nd 20 MB hard disk, ICL monitors and printers
Model 19: £2195 - Model 39: £4395 - Model 49: £4995 Monochrome terminal: £899 - Colour: £1399