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Acorn Business Computer ABC110

[ABC ]     [Computers ]


The ABC 110 is CP/M system with the BBC Micro Z80 second processor packaged inside the ABC case. It has a 5.¼" floppy disc drive, a 10MB hard disc and a colour screen. The hard disc is connected via an Acorn SCSI card and an Adaptec MFM card.

Manuals and documents

See ABC .

ABC 110 

I bought my ABC 110 in 1986 or 1987 from someone in Glasgow. It was advertised in Micro Computer Mart. I was told that Acorn owed a developer for work done but could not pay so said keep the computer instead. I was living near Cardiff so I had a long drive to collect it. I remember staying overnight in Glasgow and visiting the Burell Museum in the morning before collecting the computer and heading home. I used it for about a year as I ported some software to CP/M. Unfortunately somewhere along the way I lost the original box and polys :-(

Unfortunately my ABC 110 no longer works, there wass a problem with the floppy disc drive and the hard disc so that although it will power up, it will not complete booting the the CP/M C> prompt. I have tried to get it repaired and Steve Bass spent a lot of time getting it all working except he could not recover CP/M from the faulty hard disc..
Here are some pictures:


ABC 110

ABC 110 screen and keyboard.

Acorn Business Computer label  

The Acorn Business Computer label

The Acorn Business Computer label on the screen and keyboard.

ABC110 keyboard

Acorn Business Computer keyboard

 The Acorn Business Computer keyboard had the Reset button and the Tube on/off switch behind the Acorn Business Computer logo on the back of the keyboard.

ABC110 rear

 Acorn Business Computer rear view

 The rear of theABC110 showing, at the bottom, the standard BBC Micro ports (video, RGB, RS423, cassette, analogue in & Econet). The 1MHz bus, keyboard and printer connections are above. There is also a cutout for a BT link (presumably a modem).

ABC110 with top cover removed  

Acorn Business Computer with the top cover removed.

ABC 110 with the cover off showing the Microvitec colour monitor.

ABC110 fully opened up  

Acorn Business Computer fully opened up

 ABC 110 with the monitor tipped forward showing the BBC B+ motherboard. The two wings on either side are lowered to give access to the Z80 card (left) and hard disc controller (right).

ABC110 Z80 card  

ABC110 Z80 processor card (top)

ABC 110 Z80 card from the left hand wing (look from the back). The same card is used in the Acorn Z80 second processor.

ABC110 hard disc controller

 ABC110 hard disc controller

The ABC 110 hard disc controller from the right hand wing (looking from the back). The Acorn board is on the left and the Adaptec board is on the right. The Acorn board connects the the 1MHz bus.

ABC110 power distribution board and floppy dic drice  

ABC110 power distribution board and the disc drives

The ABC 110 power distribution board at the top and the floppy and hard disc attached to the base of the monitor.

ABC110 BBC B+ board  

ABC110 BBC B+ board

The ABC BBC B+ board half hidden by cables. The ROMs are on the lower left, they include View 3.0 and ADT 1.0 as well as the ADFS, DFS and OS/BASIC ROMs.


Serial No,ABC 110 No.52
WIN 447A2105
Motherboard233,00 Issue 1
CPURockwell R6512AP
CPU Clock2MHz
ROM48KB (Maximum 192KB)
Disc ControllerWD1770PH
Disc Filing SystemADFS
Hard disc controllerAcorn Winchest Disc Host Adaptor (227,000 issue 2)
Adaptec ACB400 SCSI
Hard disc10MB
2nd processor board209,000 Issue 2
2nd processor CPUMostek Z80-CPU
2nd processor CPU Clock6MHz
2nd processor Memory64KB
2nd processor OSCP/M 2.2