These might be useful as a source of example programs. Most of them rely on graphics, or Cortex hardware, so few are good for my text-only board. Oh well, at least this index will be of interest to Cortex users.

Issues 1, 5 and 8 have not appeared on the internet yet. 

1. Not available yet

2. ETI Cortex Users Group News Letter 2

   • Editorial
   • Terminal emulator program extension
   • Gaming keys routine
   • BASIC sprite designing progran
   • Bell modification
   • Better use of graphics mode
   • Bullet-proofing RAM in software
   • Quad-speed saving and loading
   • Centronics printer spooler
   • Useful routine addresses
   • Lower case generation program
   • Automatic movement of sprites
   • 3D graphing
   • Multicolour mode
   • Monitor tip
   • Character definition program
   • Calendars
   • Cortex article from PCN December 1984

3. ETI Cortex Users Group News Letter 3

   • Cortex Tips
   • Programs
     • Keyboard reading and Scrolling
     • Flashing cursor
     • Adding new commands
     • Shares
     • Multicolour mode
     • Machine code loader
     • Shape
   • Bug Bytes - Your problems and solutions
   • Corrections to newsletter 2
   • Cortex software scene
   • Order Form
   • Markrosoft advert
   • External video board for the Cortex
   • Floppy Disk Controller parts list

4. ETI Cortex Users Group News Letter 4

   • Programs sent in by users
   • Competition and User Info
   • Your problems and solutions - Bug Bytes
   • Programming Tips
   • Software Scene
   • Cortex Hardware
   • Order Form
   • Subscription form and questionnaire

5. Not available yet

6. ETI Cortex Users Group News Letter 6

   • EDITORIAL News, future products, and new software/hardware
   • BUG BYTES Problems in Cortex hardware and programming
   • PROGRAMS
     • CDOS modification
     • 2D plane plotter Automatic
     • List Directory
   • USER INFO Your requests and information exchange
   • FEATURE Adding extra BASIC statements
   • SHORT TIFS Programming and hardware tips
   • MACHINE CODE Part two : Addressing modes
   • USERS ADVERT
   • EXTRA FEATURE Generating magic squares

7. ETI Cortex Users Group News Letter 7

   • EDITORIAL Software and Hardware News
   • BUG BYTES Problems in Cortex hardware/programming
   • PROGRAMS
     • Rotating 3D pyramid
     • CDOS modifications
     • Fractals
     • List Directory
   • USER INFO Your requests and information exchange
   • FEATURE Cassette Interface Modifications
   • SHORT TIPS Programming and hardware suggestions
   • MACHINE CODE Part three: Arithmetic and Logical operations
   • USERS ADVERT

8. Not available yet

9. ETI Cortex Users Group News Letter 9

   • Editorial (The future of the user group)
   • Programs
   • Hardware
   • Short tips
   • Feature (DIR statement)
   • Points to note
   • User adverts

10. ETI Cortex Users Group News Letter 10

    • Editorial note
    • Letters
    • Variable listing program
    • More on Disk Inspect
    • Basic programs in EPROM
    • Extra system ROM
    • Better data separator
    • Short Tips

11. ETI Cortex Users Group News Letter 11

    • Letters
    • Editorial
    • Programme (solving linear equations)
    • More on Disk files
    • Getting onto E.Bus part 2
    • STAR EPROM
    • Hardware modifications
    • Composite video buffer

12. ETI Cortex Users Group News Letter 12

    • Errata / News
    • Programme (PDIR Directory print utility)
    • Centronics printer port mod
    • Keys programme update
    • MDEX utilities information
    • 256K memory mod
    • Small characters in graph programme
    • Parallel plus serial I/O port
    • Keyboard mods
    • R.M. Lee 2-pass assembler update

13. ETI Cortex Users Group News Letter 13

    • Letters
    • Sound generator
    • Programme (Sort directory)
    • Programme (Double density disk inspect)
    • Programme (PCB Plotting)
    • Getting onto E.Bus part 3

14. ETI Cortex Users Group News Letter 14

    • Editorial
    • Programming the V.D.P.
    • Programme (3D bar graph)

15. ETI Cortex Users Group News Letter 15

    • Programme (Missile Command)
    • Programme (Canyon)
    • Programme (Ramdisc format utility)
    • Programme (Diskname utility)
    • Programme (Disk verify utility)
    • Feature MDEX disk operating system
    • Feature using QBASIC part one
    • 9938 VDP interface
    • Extending E. Bus memory
    • Mouse - Keyboard interface

16. ETI Cortex Users Group News Letter 16

    • Letters
    • Editorial
    • Programme (Paint and Dump changes)
    • Double stepping disk drives
    • Control keys programme
    • MDEX information
    • QBASIC part 2
    • Adverts etc.

17. ETI Cortex Users Group News Letter 17

    • Letters
    • Mdex Sequential Pascal
    • More on Canyon and Missile command
    • Adding extra serial ports
    • Qbasic part 3

18. ETI Cortex Users Group News Letter 18

    • Editorial
    • More on Canyon and Missile command
    • MDEX utilities Terminal
    • Monitor Command Extension
    • MDEX to CDOS file transfer
    • Othello
    • Mastermind
    • Compressed screen save

19. ETI Cortex Users Group News Letter 19

    • Editorial
    • Adding the Maplin 9938 VDP card
    • MDEX utilities Mapper setup/screen colours
    • Inside Cortex Basic
    • Merging basic programmes

20. ETI Cortex Users Group News Letter 20

    • Editorial
    • Letters
    • Ascii save and load routines
    • MDEX printer setup
    • Using the WD2797 Disk Controller
    • Maze Game

21. ETI Cortex Users Group News Letter 21

    • Modifying MDEX for 80 Column
    • MDEX disk structure
    • MDEX utilities additions
    • Tape streamer project