| Business | Phone |
| Abacus Data Svc 8700 W Bryn Mawr Ave 800s, Chicago 60631 | (773) 774-2471 |
| Abc Data Entry 743 N La Salle Dr 200, Chicago 60610 | (312) 649-1199 |
| Accu Med 5044 W Irving Park Rd, Chicago 60641 | (773) 777-3935 |
| Advance Keypunch Inc 70 E Lake St, Chicago 60601 | (312) 236-3258 |
| Alpha Data Svc 2750 W Pratt Blvd, Chicago 60645 | (773) 973-5520 |
| Global Research 1150 N State St, Chicago 60610 | (312) 482-9464 |
| Baron Data 3 First National Plz, Chicago 60602 | (312) 855-0445 |
| Gfs & Assoc 2513 W Peterson Ave, Chicago 60659 | (773) 561-3639 |
| C & A Computer Svc 220 S Ashland Ave, Chicago 60607 | (312) 421-1466 |
| Floppy Support 4921 N Lowell Ave, Chicago 60630 | (773) 794-9256 |
| Fiserv Inc 350 N Orleans St, Chicago 60654 | (312) 755-0219 |
| Egghead Discount Software 70 E Lake St, Chicago 60601 | (312) 444-9434 |
| Edge Systems 819 S Wabash Ave 500, Chicago 60605 | (312) 347-0880 |
| Chicago Soft Ltd 6232 N Pulaski Rd 402, Chicago 60646 | (773) 282-4777 |
| Diversified Computer Conslt 407 S Dearborn St, Chicago 60605 | (312) 566-9370 |
| Diamond Technologies Inc 8410 W Bryn Mawr Ave, Chicago 60631 | (773) 631-0546 |
| Com Stock Inc 2 N La Salle St 1807, Chicago 60602 | (312) 641-1528 |
| Data Doc Imaging Inc 8 S Michigan Ave 1202, Chicago 60603 | (312) 641-6083 |
| Datametrics Inc 540 N Michigan Ave, Chicago 60611 | (312) 527-1533 |
| Concept Systems Inc 427 W Aldine Ave, Chicago 60657 | (773) 248-6553 |
| Conspectus Inc 1560 N Sandburg Ter, Chicago 60610 | (312) 915-5900 |