TS 1000: Hardware Projects

• 1000 One Chip Mod: A Built-in NVM - This battery backed-up RAM is a miniaturization and functional equivalent of the famous “Hunter” board. It was designed by Mr. Wilf Rigter of the Vancouver, BC T/S User Group. I owe many thanks to Mr. Rigter for inspiring me to write this article, and assisting with technical advise during the construction and refinement of this
• 16K - Fitting it "Under the Hood"
• 192K ZX/TS Laptop - Reprint from ZX-Appeal.
• 24K Internal Non-Volatile Memory
• 24K NVM Inside
• 2K to 4K RAM Upgrade - An Introduction to ZX/TS Hardware
• 32K NVM System Revisited
• 32K SRAM for the ZX81
• 40K Non-Volatile Memory
• 64K Byte Memory Expansion for the T/S 1000
• 8K EEPROM Board - Build a non-volatile memory expansion board with the Seeq Technology 8K EEPROM.
• 8K of Very Low Power CMOS RAM In a World Class Computer for Only $0
• A Cheap and Simple EPROM Programmer - This article will show you how to build an EPROM programmer. Those interested in peripherals for the Sinclairs (floppy disk, electronic typewriters, etc.) can design monitors and controllers for those devices. Eventually you can program independent microprocessors for special purposes.
• A Cheap and Simple EPROM Programmer
• A Couple of Simple ZX81/Timex 1000 Modifications - Internal 16K RAM using 62256; composite video buffer.
• A Keyboard Interface for Any Timex Computer - Build a keyboard interface that plugs into the expansion interface of your 1000, 1500 or 2068. Does not require opening computer.
• A Load/Save Switch, Test Tapes, Azimuth Alignment Revisited and Micro Cartridges
• A New Life for Sinclair/Timex Computers
• A Simple Loading Aid - Plans for a small device to monitor signal levels when loading programs.
• A Video Upgrade? - Why upgrade the TS1000 video with a TMS9918 video display processor (VDP?) If you find that your computer does its job, but you would like to see it work a lot faster (in SLOW), if you’re tired of that annoying fast mode flicker, if you have a program longer than 16K of BASIC and want
• Adapting the TI Keyboard to the TS1000
• Adapting the TI Keyboard to the TS1000
• Adapting the ZX81 Rampack to the TS2068 - Adapt the 1016 ram pack, memory mapped to the DOCK bank.
• Add an RS-232 Port to Your ZX81 - Shows how to add a standard communications interface to the ZX81 – an RS-232 serial communications port that will let you access standard printers, modems, and other computers.
• Add serial port to your Sinclair - Project to add a 2050-compatible serial port to the 1000 or 2068.
• Addendum: A Simple EEPROMER - Update to Paul Hunter’s article on Bankswitching for the TS1000 (TS Horizons part 4).
• Adding A Joystick To The Timex-Sinclair 1000 - Adapt an Atari joystick to emulate the arrow keys.
• Adding a Joystick to the ZX81 - First part of an article about wiring a joystick to the computer.
• Adding a Joystick to Your ZX81 - Wire a joystick to map to the arrow keys.
• Adding a Video Monitor to your Sinclair ZX81 - Simple diagram for tapping off the signals going into the RF modulator.
• Adding On To Gladstone - Many memory expansion boards have been offered for ZX81’s and TS1000s. One of the first to break down through the $100 price barrier was the Gladstone 64K RAM pack. It gave you use of RAM memory from locations 8K through 64K. Its only short coming was that you had to ALWAYS use all of the
• Additional Byte-Back Memory Pack Notes - Thanks to John Oliger’s NOT M1 decoding circuit, many new and excellent pieces of software are coming into the market place that make use of machine language routines in the 32K-48K (8000-BFFF hex) region of memory. Some examples of these would include Hot Z-II by Ray Kingsley and Memotext in RAM, Version 3, modified and
• An Illuminating Idea - Hardware and software to switch up to four 5-amp loads at up to 110v.
• Announcing: The IKI (An IBM Keyboard Interface for 1000/2068) - The IKI can be used with the ZX80, ZK81, T/S 1000, T/S 1500, Spectrum and T/S 2068 computers. It is compatible with all interfaces for those computers. The IKI works with any IBM XT-compatible keyboard. The keyboard must have an XT/AT selector switch.
• Another Look at 450ns EPROMS vs the ZX81/TS1000 - Paul Hunter’s comments on using 450ns EPROMs on ZX/TS computers (May83) strike me as true but incomplete. Paul shows how to add a flip-flop to delay the computer by inserting wait states and thus make the computer read slow EPROMS. You can use another chip select scheme to cure access problems without adding circuitry or
• Autotape
• Bank Switching for the TS 1000, Part 1
• Bank Switching for the TS 1000, Part 2 - Describes some of the hardware needed for the project.
• Bank Switching for the TS 1000, Part 3
• Bank Switching for the TS 1000, Part 8 - This is the last instant of this series. Routines to save (and reload) bank data on tape are included in the 2K operating system. These are necessary for back-up and because the memory in most banks is volatile.
• Bank Switching for the ZX81, Part 2 - In this section the various options in the menu of the BSOS (bank switching operating system) will be discussed.
• Beep, beep - Keyboard beeper.
• Beep, Beep - Beep circuit for TS 1000.
• Buffering the Data Bus - Why it’s necessary to buffer the data bus when adding peripherals and how to do it. How the resistors on the data bus are necessary to the video signal generator.
• Bug Alert: One-chip NVM - The “One-chip NVM” in SWN 4:1 shows a minor discrepancy between the schematic (Fig. 3) and the pictorials and instructions.
• Build a 64K Dynamic Memory Board
• Build an Uninterruptible Power Supply - Add a small UPS to the TS1000.
• Build your own EPROM blower without blowing a fortune - Build an 8255-based EPROM programmer, for 2516 and 2532 devices.
• Build Your Own EPROM Programmer and Centronics Printer Interface - Part I - Multi-part article series.
• Build Your Own EPROM Programmer and Centronics Printer Interface - Part II
• Cassette Recorder Interface - Build a small interface unit to improve program loading.
• Cassette Tape Load/Save Monitor
• Centronics Style Port TS-1000
• Cheap Power - Surplus power supplies can double a ZX/TS’s load capabilities.
• Circuit Circus - Excerpted from SWYM Newsletter, Seattle Sinclair Users Group. Sync inverter for QL, load fix for ZX81/TS1000, TOS power supply, modem power.
• Circuit training helps to build good characters - Expansion to allow user-defined characters.
• Clearer Video
• Connect A Composite TTL Monitor to a TS1000/QL - Schematic to connect a TS1000 or QL to a monochrome TTL monitor by extracting HSYNC and VSYNC signals.
• Connect a Monitor to the TS1000 - How to connect a TS1000 directly to a composite monitor.
• Connect a Monitor to the TS1000
• Connect a Monitor to the TS1000
• Connect a Monitor to the TS1000
• Convert your T/S,ZX to Color - Build an add-on to connect a 6847 video display generator (same as in Radio Shack Color Computer) to your TS1000.
• Cooling Your ZX81/TS 1000
• Creating a Four Port Expansion Decoder - Memory-mapped IO for the 1000 computer.
• Cursor Joystick (for the ZX81 & 2068) - Describes how to wire a joystick port for use with a Spectrum ROM.
• Custom Keyboard Tip - Did you hook up one of those TI keyboards to your ZX81/TS1000? Don’t you wish it had all the Sinclair legends on the keys? Well, if you can find an old membrane keyboard (remember those?) you can cut it up and paste the legends onto the keys with silicone glue.
• Dock Bank Memory for Twenty Cents: Convert a TS-1000 Ram Memory for the TS-2068 - How to convert a 64K RAM pack for the TS1000 to map to dock memory on the TS2068.
• Driving a Monitor From the T/S 1000
• Driving a monitor from the TS 1000 - Reprint of an article from an earlier issue. Transistor-based circuit.
• Driving a Monitor From the TS 1000
• Driving a Monitor From the TS 1000
• Driving a Monitor From the TS 1000
• Eprom Burner Program - Program to accompany the EPROM programmer described in Sinc-Link v2 n6.
• EPROM Programmer You Can Build, Part II - Program to use the EPROM programmer with the TS1000/1500 along with details about cartridge format EPROM settings.
• EPROM Reader and Burner Uses - Benefits and procedures for reading and burning EPROMs.
• EPROMS Are Alive and Well ... And Living in Redwood City
• EPROMS Are Alive and Well...
• Error Codes: Revising a Hunter Board to Hold 32k - Correction to “Revising a Hunter Board to Hold 32k” that appeared in T-S Horizons n19.
• Expand Your Timex/Sinclair Operating System - Expansion card with 8K of battery-backed CMOS RAM in the 8-16K range. Part two.
• Expand Your Timex/Sinclair Operating System - Expansion card with 8K of battery-backed CMOS RAM in the 8-16K range. Part one.
• Expanding RAM - Replace the 1K RAM in the ZX81 with a 2K static RAM chip.
• Extended Problem
• Firmware Card - Card to put a 2K or 4K EPROM anywhere in the memory map.
• Fix the ZX-81/TS1000 Loose Jack Problem
• George Erickson's Ultimate Loading Solution: Batteries - UPDATES has devoted considerable space to improving loading speed convenience and dependability. Disk drives, stringy floppies, and fast load-type programs all contribute greatly to these critical factors. George Erickson, a manufacturer’s representative for Canon micro floppy drives, hard disks, and other computer equipment, uses ZX PRO/FILE to maintain his sales data. Since last November, his
• Get a Better Screen - Several circuits for composite monitor signals from the ZX81/TS 1000.
• Getting More From Each Keystroke - Hints on adding a full-size keyboard.
• Getting the LED Out
• Green and Black and Read All Over - Connecting the ZX81 to a monitor.
• Hacker's Haven Presents: ZX-81 (and 2068) MIDI Interface Project, Part 2
• Hacker's Haven Presents: ZX-81 MIDI Interface Project
• Hacker's Notebook: Joysticks
• Hacker's Notebook: TS 1000 Memory Expansion
• Happiness is a Converted T/S 1016 RAM That Works! - Addition to two part article in Time Designs in 1986.
• Hardware Buys & Tips
• Hardware Hints - Offers several solutions for preventing the ZX81 from overheating.
• Hardware Hints
• Hardware Project - This circuit will simplify loading and saving programs by eliminating ground loop noise without the need to pull out the earphone plug during saving and the microphone plug during loading.
• Hardware Tip: Keyboard Conversion - Use a DIP socket to create connectors for a keyboard conversion.
• Home Control on a Budget
• How I Made My Fullsize Keyboard - Describes how to connect a surplus keyboard to a ZX81.
• How to Build an Inexpensive Joystick Interface - Simple circuit and software to interface Atari joysticks to the 1000.
• How to Convert a Surplus WC2050 Modem into an RS-232 Serial Interface for your TS1000/1500/2068
• How to Convert a Surplus WC2050 Modem into an RS232 Serial Interface for your TS1000/1500/2068
• Improving Timex/Sinclair Tape Loading - Reduce troublesome dropouts and noise problems with a Z-Dubber. Schematic and PCB layout for the Z-Dubber is provided.
• Increase Your Memory - Replace the internal RAM chip in a ZX-81 or TS 1000 with 8K static RAM.
• Input/Output: A Big Keyboard - Instructions on interfacing a full-size keyboard to the TS 1000.
• Install A Reset Switch
• Installing a UHF Modulator
• Interface a Joystick to Your TS-1000 or ZX81
• Interfacing a Real Printer to the Timex/Sinclair 1000 - Author uses the CAI/O interface board to connect his upgraded MicroAce to an Okidata Microline 92.
• Interfacing An Electronic Typewriter to a ZX81
• Interfacing Tips and Troubles: Interfacing the Sinclair Computers, Part One - Introduction to interfacing the 1000, 1500, 2068 and a schematic for interfacing.
• Interfacing Tips and Troubles: Interfacing the Sinclair Computers, Part Two - Basic and machine language routines for interfacing. Tri-state interface schematic.
• Interfacing Tips and Troubles: Memory Mapped I/O on the Sinclair ZX81 - Memory-mapped IO on a Timex/Sinclair computer.
• Interfacing with Brother's EP44 Typewriter
• Internal 64K RAM for the TS/ZX - Upgrade to 64K with a 43256 static RAM chip and some memory decoding.
• Introduction to Computer Control - Introduction to using the TS 1000 as the basis for a robot.
• Just for Thought
• Keep Your Cool - Techniques for improving cooling in the ZX81 and its RAM pack.
• Key Board Mania, Part 3
• Keyboard Alternatives - Alternatives to the Sinclair keyboard: overlays, beepers, full keyboards. Plans for wiring your own keyboard and list of keyboard alternative vendors provided.
• Keyboard Conversions for ZX/TS - Overview and how-to attach a full-size keyboard to a ZX81 or TS1000.
• Keyboard Interface for the TS1000 and the 2068
• Keyboard Mania, Part 1
• Keyboard Mania, Part 1
• Keyboard Mania, Part 2
• Keyboard Mania, Part 2
• Keyboard Mania, Part 3
• Keyboard Mania, Part 4
• Keyboard Mania, Part 4
• Keyboard Mania, Part 5
• Keyboard Mania, Part 5
• Keyboard Mania, Part 7
• Keyboard Mania, Parts 6 & 7
• Larken & Hunter - Add a switch to the Hunter 8K memory board so it will work with the Larken DOS ROM, which occupies 12-16K region.
• Letter from Edward Loxtercamp - Offers help to users who want to build his RS-232 interface.
• Load and Save Easier with LED VU Meter
• Machine Code Development System For Your Timex Sinclair 1000 - Turn your Timex Sinclair 1000 or Sinclair ZX81 into a high-speed, machine-code development system.
• Machine Code Development System For Your Timex Sinclair 1000 Part II - Turn your Timex Sinclair 1000 or Sinclair ZX81 into a high-speed, machine-code development system.
• Machine Code Execution Above 32K - Execute machine code with addition of one chip to create new logic signal.
• Machine to Machine Transfers
• Machine to Machine Transfers
• Make Your Own 2068 & TS1000 EPROM Progammer - Here is a project that will let you “burn” (program) EPROMS using your computer. It will handle either the 2764 type (8K bytes) or the 27128 (16K) EPROMs.
• Making the 1000/ZX81 Even Better
• Making the T/S 1000 & ZX-81 Even Better
• Marathon Operating Times for the Timex-Sinclair - Techniques for preventing overheading-related shutdown.
• MAX 1000: Make the Most Popular "Mods" Compatible On Your TS1000 - Collection of upgrades/modifications to the 1000.
• Mem Saver
• Memopak RAM and TS 2040 Printer Compatibility
• MIDI
• Mini-Motherboard
• Mod to Use Hunter RAM with > 32K - Hunter boards require a modification to work on systems with more than 32K RAM.
• Monitor Output for the TS-1000 & 1500 - Schematics for adding monitor connectors to each computer.
• More On-Board Memory For ZX-81/TS-1000 - Options for internal memory upgrades to these computers.
• New Locations for M/C Routines in a 64K RAMpack - Small hardware modification to allow machine code programs to run in the 32-48K RAM space.
• New Locations for M/C Routines in a 64K RAMPack
• New Locations for MC Routines in a 64K RAMpack
• Ni-Cad Charger - Constant current charger for TS 1000.
• On Board Computer
• One Chip Mods - Modify memory-mapped Byte-Back modules to work better with an expanded TS1000.
• One Chip Mods: Recycle that 16K RAM pack - Instructions on how to alter a standard 16K RAM pack to work as 2 8K banks in the 8-16K region of the TS 1000.
• One Chip NVM Correction - Improved schematic for design from July/August 1986 newsletter.
• One-Chip Mods: Built-in NVM - 8K RAM mapped to 8-16K region, internal to the computer. Compatible with Hunter board.
• PET ASCII Output Program for the Timex/Sinclair ZX81 - This article describes a project which may be useful for anyone desiring to use software for the ZX81, TS1000 or TS1500 on a different computer. The program version presented here is designed to convert Sinclair BASIC programs into ASCII text which can be sent from the Sinclair computer to the serial port of a Commodore
• Poor Man's MODEM
• Poor Man's Modem
• Poor Man's Modem
• Port Project #1: Data Communications Between Two Computers - This first project gives you the basis of a very useful application involving I/O ports–communicating between two computers.
• Port Projects: Get the LED-OUT - In any number of monitoring and/or control uses for your ZX/TS, you may find that using a TV set to check on your system is inconvenient or impractical. This would be so, for example, in outdoor or dirty environments or when you simply wish to check the status of one or two system parameters without
• Power Supplies
• Pseudo-ROM
• Quick and Easy Video Output for the ZX81 and TS1000
• RAM Pack Repairs
• RAMKIT: Build your own 64K RAM - Build the RAM module with parts from Gladstone Electronics
• Repeat Key
• Reset Switch for ZX81 and 2068
• Reverse Video
• Reverse Video Monitor Driver - This circuit, using the concept published in Electronics, drives a video monitor and reverses video on demand.
• Revised Schematic of Digi-Dubber
• Revising a Hunter Board to Hold 32K Bank Switchable NVRAM - With HM6264LP-I5 28 pin RAMS at less than $4 each, l have devised a not-too-difficult revision to a Hunter board which will give your ZX81/TS1000 four switchable 8K sections of write-protected NVRAM on the one board.
• ROMPAK - The Rompak cartridge can instantly load programs, such as games or utilities, into memory. The cartridge is memory mapped in the unused 8 to 16k block of memory, and it has an expansion connector out the back, so it can be used with the T/S printer or ram pack.
• RS232 I/O Revisted
• Run TS1000 Machine Code in High Memory - This trick was originally published in Syntax Quarterly, Summer 1983. It will allow you to use the 32-48K RAM area for machine code, if you have the Memotech or JLO 64 K boards (and maybe some others, but not the Byte-Back UM).
• Say What? - Simple speech recognition hardware and program for ZX/TS computers (with at least 16K RAM). The word “simple” should be emphasized. The program is relatively simple to enter and run. It is limited to recognizing only ten simple words (but ten words of your choice!). It is not designed to replace your keyboard , rather it
• Signal Booster - Use an audio transformer to boost tape signal. Reprinted from Sincus News, May/June 1986.
• Signal Booster
• Simple Reset Switch - Instructions and schematic for adding a debounced reset switch.
• Simple Video Inverter for ZX81
• Single-Key Shifted Functions - Describes how to use diodes and integrated circuits to map a single key to a shifted-key function on the ZX81.
• Slave CPU Processing: Applicable to ANY Host Computer - Discusses how to apply techniques described in “Interfacing to S-100/IEEE 696 Microcomputers” by Sol Libes and Mark Garatz to the Timex Sinclair 1000 and 2068.
• So You Wished You Had Bought a TS2000 - How would you like to have a computer with a color video display of fifteen colors, quality sound, high resolution, unlimited character sets, and a dual joystick interface? How would you like a system in which you do not have to worry about expansion? If you have a ZX81 (or ZX80 with the 8K ROM),
• Sound Generator for the ZX 81 - Three tone generator, one noise generator project. Reprinted from Electronics, Dec 1982 – Feb 1983 issue.
• Sound Generator for the ZX81
• Spectrum Hardware Restart - Photocopied from the March 1986 issue of Practical Electronics.
• Spectrum Motherboard - Create an expansion board for your computer.
• SQ-UP - In David Ornstein’s premier issue article (SQ Winter 82 p. 29) Using Extra Keys on Big Keyboard, add a symbol A atop the D1 lead toward the right-hand edge of the page.
• Store BASIC on EPROM with an EPROM Programmer - Construction article for an EPROM programmer for the ZX81/TS 1000.
• Super Data Save - Construction tips and parts list for a load filter and software package for the ZX81/TS1000.
• Super Joystick - Use readily available hardware to create a full-function joystick compatible with the ZX81.
• Surplus Keyboard Improvements for Extra Shifted Keys - The TI 99-4A keyboards, still widely available, are an ideal unit for the ZX81/TS1000 computers. Recent and not so recent articles have shown how the shifted keys on the KB-0 line cam be connected using two diodes. This method can give you four useful and often used shifted keys: EDIT, DELETE, quotation marks, and FUNCTION.
• System Expansion Hardware - System Enclosures and Radio Frequency Interference; an add-on expansion bus.
• T/S 1000 40K Non-Volatile Memory Expansion Project, Part II
• T/S 1000/ZX81 External Keyboard Buffer
• Tactile Feedback for a Dime
• Talk Can Be Cheap - Interface a ZX80/81 or TS1000 to a Texas Instruments Speak & Spell.
• Tape Amplifier for Loading Weak Tapes - Circuit diagram for an op-amp based signal booster.
• Tape Amplifier for Loading Weak Tapes
• Tape Level Indicator - Bar-graph level indicator using LM3914.
• Technical Tips for the Timex - Add a repeat key to the TS1000.
• The "Truly Portable" Sinclair/Timex - Powering a T/S 1000 from Polaroid SX-70 batteries and a simple reset switch circuit.
• The 192K ZX/TS Laptop Project
• The Amazing Digi-Dubber
• The Great RAM Rescue - Remap the internal RAM to the 8K-16K block. For ZX/TS computers with a 16K RAM pack.
• The Great RAM Rescue - Reprint of article from SYNC magazine.
• The Joy of Joysticks: Add This to "Repeat-Key!"
• The Portable Timex - Reprinted from Computers & Electronics, August 1983.
• The Solid State Disk Drive (Part 3) - Four part construction article on building an EPROM/SRAM storage device for the TS 1000.
• The Solid State Disk Drive (Part 4) - Four part construction article on building an EPROM/SRAM storage device for the TS 1000.
• The ZX Breadboarder: A Proportional Joystick Interface
• The ZX Breadboarder: The Digi-Dubber
• The ZX-81/TS1000 Column
• The ZX/TS and 2716 450ns EPROMS - You may run into trouble using 450ns 2716 EPROMs on your ZX/TS.
• The ZX/TS Serial Link
• The ZX/TS True 64K Internal NVM Upgrade
• The ZX81/TS1000 Column - Replacing the VHF modulator.
• TI99 Keyboard - So, you got one of those TI99 keyboards from Radio Shack for $2.95 and still have not wired it up to your 1000 or 2068, right? I was going to write this up a while ago, but I learned that so many different companies made the circuit boards that it would be difficult to give
• Tim's Schematic: ZX81/TS1000 Out-Board Clock Module
• Timex Graphics
• TMS9918A Video Upgrade For The TS1000 - As can be expected with any major hardware upgrade, there are a few conflicts when the Oliger video system is used in conjunction with other equipment. Summarizes the fixes we and others have come up with to date.
• TMS9918A Video Upgrade: Part 1 - The TMS9918A video project consists of two PC boards, a small modification/addition to the main computer board, and a +5, +12, -5 VDC power supply (an expansion board of some type is necessary). Video board “A” contains the TMS9918 VDP chip, 16K video ram and one support chip for I/O interfacing. Board “B” contains the
• TMS9918A Video Upgrade: Part 2 - This second installment involves some explanation of the changes to the operating system and how they have been implemented. By actually placing the contents of the ROM on EPROM, you can change any routine, implement extra commands outside of the 8K ROM and have BASIC control of your new routines. It is only necessary to
• Tone Generator - Generate tones on your ZX/TS by building this circuit and using a machine code routine with it connected.
• Truly Portable Computers - Letter to the editor from a Polaroid employee, suggesting the P100 Polapulse Powerpack as an alternative to SX-70 batteries for making a Timex/Sinclair portable.
• TS 1000 Hardware Mod - Small, single capacitor mod to potentially improve video signal on TVs.
• TS 1000 Keyboard Add-On - Wire a keyboard to your TS 1000.
• TS 1000 Memory Expansion - Mod to support adding a 2nd 16K RAM pack to the TS 1000.
• TS 1000 ROM Swap
• TS 1000 Signal Booster
• TS 1000 Stability Tips
• TS Help and Information: Modifications to Add-on Keyboard - Add one-key shift-lock, delete and function keys to a TI keyboard converted for the 1000.
• TS-1000 Using 3 16K RAMPacks
• TS1000 Keyboard Addition
• TS1000 Monitor Project
• TS1000 Pulse Cleaner
• TS1000 RAM Pack Upgrades
• TS1000 Turbo
• TS1000 Turbo
• TS1000 Turbo
• TS1000 Turbo - Add a switch to add “turbo” mode to the TS1000.
• TS1000 Video Driver
• TS1000 Video Driver Update
• TSMON
• Turbo Switch for the ZX81 - Transcribed from the Winter 1993 issue of ZXir QLive Alive.
• Two Memories in One Space - Simple solution to multiplex the 8k-16k memory space.
• Two Switch Human Interface for the Communicative Impaired - The program will usually display three rows of characters on the screen at any lime: the upper alphabet (UA) row, the lower alphabet (LA) row, and the message row. which will be empty at first. The program allows the user to select letters from the alphabet rows for display in the message row.
• Understanding and Upgrading The TS1016 RAM Pack - This is the second part on upgrading your TS 1016 RAM pack to 64k. Last issue we discussed the ins and outs of dynamic memory and how the Sinclair RAM pack works.
• Upgrading T/S Video - Correction to “Upgrading Timex-Sinclair Video” in the May 1983 issue to address a revision to the ZX81 circuit.
• Upgrading Timex/Sinclair Video - Provides direct video and white-on-black screen characters.
• Upgrading to a "Real" Keyboard: E-Z Key Makes It Easy - Schematic to add a keyboard that plugs into the expansion port. This is the same interface that is used in the E-Z Key 60.
• User Defined Graphics for the TS-1000
• User Defined Graphics for TS-1000, Part II - Program to generate and store your own characters into the custom graphics board as described in the prior month’s issue.
• Using Extra Keys on Big Keyboard - A Simpler Approach - Connections to map a single key to replace two keystrokes.
• USR Key
• Vector Graphics - Hardware and software to drive a vector display.
• Voice Reproduction - Machine language tools to sample and playback voice recordings.
• WRX 16 Hi-Res for the 1000 - For several years, ZX81/TS1000 owners have dreamed of a simple bit-mapped high-resolution system for their machines. The quest began with the appearance of “software-only” high-resolution packages, which offered an improvement over the crude 44×64 block pixels, but left much to be desired regarding precision and ease of use. Several manufacturers came out with hardware add-ons
• Your Timex/Sinclair Can Become a Terminal - Build a 8251 USART interface to connect a Sinclair to a modem.
• Z80 LCD
• ZEX for the ZX81
• ZVOICE - Like many of you, I have been fascinated by the idea of speech synthesis. I even bought a GI SP0256 chip only to have it sit on a shelf, silently gathering dust. After all you need a robot or I/O board to make it work, right? Meantime others were having fun and contributing to the
• ZVoice - Reprint of ZVOICE.
• ZVOICE Part 2 - Listing 4 shows how a text to speech program can be implemented. A text string is scanned one word at a time, with “spaces” as separators. If the word is in the vocabulary, then the word is spoken; if not found, phonetic pronunciation of the word, or the phrase “WORD UNKNOWN” is spoken. New words
• ZX Analogue-to-Digital Converter - Fast eight-bit analog to digital converter project.
• ZX Burglar Alarm
• ZX Burglar Alarm
• ZX Resources - Parallel interface using the Z80 PIO chip.
• ZX Resources: RS232 I/O
• ZX Resources: Transferring Between Computers
• ZX-81 Computer Joystick - Describes how to connect a joystick, includes demonstration program.
• ZX-EPROMer
• ZX/TS Repair Guide - Part II - Tips on repairing the ZX81/TS 1000.
• ZX/TS ROM and RAM Addressing - Investigation into PEEKing and POKEing outside the 16K-32K address range and how to use a 74LS138 to decode RAM in the 16-32K range.
• ZX/TS True 64K Internal NVM Upgrade
• ZX81 & QL Regulator Bug - Suggested solutions to power regulation problems in the ZX81/TS1000 and QL: add capacitors.
• ZX81 Data Acquisition Module - A/D converter for the TS/ZX using the TLC548.
• ZX81 Data Acquisition Module - Part two of series on building a digital-to-analog converter.
• ZX81 Direct Video Output
• ZX81 EPROM Board - Schematic for interfacing an EPROM, static RAM or SEEQ’s 2K EEPROM to the ZX81/TS 1000.
• ZX81 EPROM Board - Board layout, parts list and program listings. Continued from Sinc-Link v6 n1.
• ZX81 Loading Filter/Interface - Op-amp based load filter schematic and construction details.
• ZX81 RAMpack Expander
• ZX81 Resources - 1mb Bank-Switched Memory Board.
• ZX81 Resources: 1mb Bank-Switched Memory Board
• ZX81 Resources: 64K SRAM Memory
• ZX81 Resources: A Tethered Robot
• ZX81 Resources: Analogue to Digital Converter
• ZX81 Resources: Joystick
• ZX81 Resources: Joysticks
• ZX81 ROM Adapter 2764 EPROM to Replace Sinclair ROM - Schematic to connect an EPROM in place of the ROM.
• ZX81 Tape Controller
• ZX81/TSXXXX Out-Board Real-Time Clock
• ZX81/TSXXXX Out-Board Real-Time Clock
• ZXVoice