These are the contents [D1..D5] of CCP/M v3.1, a.k.a. Concurrent PC-DOS, a.k.a
Starlink, for the IBM PC or PCXT. The bad news is it requires installation of 
the StarLink 4 port add-in card, the system checks for its presence on boot-up.
Perhaps modifications could be made to strip that out.  The 4-port card is an
XT plugin card with its own 8088 processor and 64k memory for address space at
0E000:0000h to 0F000:0000-1h, each port uses a 16k workspace for communication
to connected terminals via RS-232 connections re the 4-port card.  Four
terminals plus main XT = 5 user system.  Selectable IRQ, default IRQ 5 maybe?

D1 := 1 of 5 := StarLink Concurrent PC-DOS  For IBM PC or PCXT Boot Diskette.
D2 := 2 of 5 := StarLink Utilities I  For IBM PC or PCXT.
D3 := 3 of 5 := StarLink Utilities II  For IBM PC or PCXT.
D4 := 4 of 5 := StarLink Terminal Install Disk  For IBM PC or PCXT.
D5 := 5 of 5 := StarLink PC-DOS GSX Patch  For DR Draw, DR Graph.

All have copryright date of 1984.  All have s/n 2004-0000-000268

--eof--