COSMAC ELF

Ipso Facto Issue 4

• Outline of a Text Editor
• Economical Hex Display
• A Monitor for ASCII Keyboard and Display
• Memory Mapped I/O
• +/- 12 Volts on Tekatch Bus
• Memory Test Routine
• Other Club Newsletters
• Random Number Generation
• ROM Out of RAM
• Another Keyboard Approach
•  Interrupt Processing on the 1802
• Errata: Tape Test Routine
• TEC-Editor Disassembled
• Some Notes on Connecting an 1861 to a TV

Ipso Facto Issue 5

• Hardware Paper Tape Loader
• Is Your Microcomputer S100 Compatible?
• Logic Tester
• A Single Cycle Circuit for the 1802
• A Fine Resolution Audio Oscillator Program
• Certifying Audio Tape for Digital User
• A Coin Toss Program
• Magnetic Tape Data Recording
• A Simple 25 IC, 2 Transistor Code Practice Oscillator
• Hex-Decimal Conversion and ASCII
• Items For Sale
• A Disassembly of Ed McCormick’s Monitor
• A Note of Caution from Ed McCormick
• The 1802 Music Machine
• An RS-232C Interface
• Errata: Memory Mapped I/O
• Errata: 1802 Interrupt Processing
• TEC-1802 Speed Considerations
• A Low Cost 8 Digit Hex Display
• Using the 8 Digit Hex Display

Ipso Facto Issue 6

• A Software Standard for Kansas City Standard Tapes
• Abstracts from Dr. Dobb’s Journal
• A Game of Life for the 1802
• A CMOS 16x32 Video Display
• Build a 1K Video RAM
• Reply from Netronics Ltd. President
• An Extra Page of ELF Memory
•  Instant Editor
• Interfacing a Baudot Teletype to an 1802
• A Mouse Trap Game for Pixie Graphics
• The 1802 Programmer’s Notebook
• Errata
• An 1802 RAM System
• Combination Lock and Door Chime
• A Different Cassette I/O Routine
• Winning Ticket Draw Program

Ipso Facto Issue 7

• Tapeworm Anyone?
• High-Low Game
• Errata
• Is it a Keyboard?
• Electronic Metronome
• 1802 Opcode Table
• Hangman Program
• Tiny Basic on the VIP System
• 1802 State Indicator
• Copy Memory Routine
• Microcomputer Interfacing
• 1802 Manual Debugger
• An 1802 Disassembler
• A Tiny Basic Square Root Routine

Ipso Facto Issue 8

• Mouse Trap Game
• Binary Quiz Program
• VIP Software Update
• State Display
• Software for CMOS 16x32 Video System
• The Three Keyboard Problem
• Programmer’s Zodiac
• An RCA CDP1802 System
• Software for 1K Video RAM
• Variation on a Theme
• Tiny Basic Square Root Routine Version 2
• Fast Memory Test
• An 1802 DMA Controller
• Program for Fast Memory Test
• Schematic for 1802 DMA Controller
• Memory Page Decoders
• Logic Probe
• Software for the Ipso Facto Standard for KC Tapes
• A/D Notes
• Christmas Computer Music
• Hardware Basics
• Game of Life Update
• ACE Tutorial
• Diagrams for Game of Life Update

Ipso Facto Issue 9

• Some Thoughts on the Call and Return Technique
• COSMAC ELF Reference
• Automatic Program Counter Stepper
• Notes on Netronics Tiny Basic
• Some ELF II Enhancements
• Some Simple 1802 Programs
• Programming the DM8577 (32x8) PROM
• Ping Pong
• ACE Tutorial
• Fix for 1861 Display Jitter
• Radio Shack Keyboard Enhancement
• New Basic for COSMAC 1802 Available
• Netronics Monitor Disassembled
• Partial Display Routines for ELF Systems
• Interesting Computer Articles
• Errata
• Running Ipso Facto Cassette Software on the ELF
• Netronics Giant Board Notes
• Studio II Conversion Kit
• Tic-Tac-Toe with the 1802
• Key In Loader For ELF II Format Files
• Life for an ELF