General information on Norhstar computers see Wikipedia,

My machines

One of my working N* with an  Lear Siegler ADM 5 terminal

One machine with 2 modern floppy drives and the other with a hard disk and one floppy  drive.

Inside of the machine with the hard disk.

S100 bus technologie , backplane and the power supply electronics and the serial and parallel connections .

It runs Northstar Dos 5.2 or CP/M 2.2

Floppys are hard sectored 10 sectors/track

My Original  North Star Documentation:

16K ram board Revision 1
16K ram board Ram-16-Doc
Z80A processor board ZPB-A
Micro disk system MDS-A-D Double density Revision 2
North Star horizon computer system Revision 1
North Star Hard disk operating system
Horizon HD-5 Hard Disk Technical manual
Horizon HD-5 Hard Disk Installation guide
The North Star  monitor version 1Revision 1
System software manual addendum July 1980 Revision 2.1
System software manual Rev 2.1
North Star Pascal Version 1 PAS-DOC Revision 3
North Star Basic Version 6 Version 6-FPB
The North Star Disk Operating System Version 2 Release 3 Revision 5
CP/M Preface
CP/M Operating system manual
Release 4 System software changes June 1978
North Word
Info Manager

Magasines  dedicated to  North Star Horizon

N*GG (Nederland/België) Uitwisselingsbrief 1 t.e.m. 24
The Compass Volume 1 Nummer 1 tot Volume 5 Nummer 6

Software - books and discettes

Micro Mike's Inc   Inventory control
                                Accounts payable
                                General Ledger
                                Program operation
                                baZic Operator's Manual
Osborne & associates   Accounts Receivable
                                        General Ledger
Dynacorp   Flyght Simulator
                    Chess Master
                   Sortit                                         

Software preservation Tools

Information about disk image transferts between a Northstar Horizon and a PC http://www.classiccmp.org/dunfield/img/index.htm

Image files created by Dave Dumfield

N*Dos 5.2DQ NSDOS52Q.NSI

N*CP/M 2.2 N22A_56.NSI 56k ram memory

Lifeboat CP/M 2.2 C223A_24.NSI 24k ram memory

Lifeboat CP/M 1.4 C145_54.NSI 54k ram memory

N*UCSD Pascal PASNS.NSI PASAUX.NSI

Other Internet links

14 technical documents about North Star online

Technical manual ADM-3A  terminal online

Story of the S-100 Bus

Last update 1/10/2008