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Byte-Back Co

Leesville, SC 29070

BYTE-BACK started producing peripherals for the Sinclair computer in 1981.

Their first product, a relay controller, was used by customers to control and automate projects.

The original owner closed the company in the mid-1980s. David Leech, a former employee, purchased the company and continued to sell existing inventory.

In the late 1980s, Leech introduced multifunction controllers for the IBM PC.

Products

Name Description Computers
Analog-Digital Module With the addition of the A-D module, the BB-1 or BB-68 can read analog signals. The A-D is a single channel successive approximation device. It can read an analog signal on 5 different scales: <0 to .25v, 0 to .50v, 0 to 2.75v, 0 to 5.00v and 0 to 10.0v. Timex/Sinclair 1000, Timex/Sinclair 2068
BB-1 Control Module 8 independent relays with LED status indicators and 8 TTL inputs with Schmitt trigger buffers. Single POKE to change/latch each relay. Read all 8 inputs in a single PEEK. More than one BB-1 can be attached to the computer. The BB-1 was used for: Sinclair ZX80, Sinclair ZX81
BB-68 Controller 8 independent relays with LED status indicators and 8 TTL inputs with Schmitt trigger buffers. Single POKE to change/latch each relay. Read all 8 inputs in a single PEEK. More than one BB-1 can be attached to the computer. Timex/Sinclair 2068
Byte Back Keyboard Upgraded keyboard with full-size space bar and two shift keys. Timex/Sinclair 1000
M-16 Memory Module Stackable with Sinclair RAM or other M-16 modules to 48K. Sinclair ZX80, Timex/Sinclair 1000
M-48 Memory Module 48K RAM module. Sinclair ZX81, Timex/Sinclair 1000
M-64 Memory Module Low power, no extra power supply required. Area from 8-16K can be switched out in 2K increments to accommodate memory-mapped peripherals, EPROMs, etc. Timex/Sinclair 1000
MD-1 Modem Includes RS-232 port. Sinclair ZX80, Sinclair ZX81, Timex/Sinclair 1000
MD-2B Modem Works with any amount of memory on the 1000; with 64K will store 60 screens. Terminal software included. Prints to 2040 or any serial printer via built-in RS-232 port. Sinclair ZX81, Timex/Sinclair 1000
MD-68 Modem 300 baud. RS-232 port. Timex/Sinclair 2068
Parallel 1000 Interface to Centronics parallel interface printers. Driver translates Timex/Sinclair code to 80 column ASCII and sends printer via USR calls to simulate LPRINT, LLIST and COPY. Timex/Sinclair 1000
Parallel 2068 Interface to Centronics parallel interface printers. Driver software supports LPRINT and LLIST. High resolution screen copy program supports multiple printers. Timex/Sinclair 2068
Real Time Clock Clock module with battery back up. Logic signal output with LED status indicator can be used to control external devices based on time independent of the computer. DIP switches allow mapping of the module to the 8-10, 10-12, 12-14 or 14-16K areas of memory. Timex/Sinclair 1000, Timex/Sinclair 2068
RS-232 for 2068 Connect serial devices to the TS 2068. Driver software supports LPRINT and LLIST. Timex/Sinclair 2068
RS-232 Module Connect to RS232 printers and terminals. USR calls simulate LPRINT, LLIST and COPY commands. Timex/Sinclair 1000
SpectraTERM 1.30 300 baud terminal program for the 2068, for use with the Byte-Back MD-68 modem. Timex/Sinclair 2068
UM-16 16K RAM Pack “Ultimate memory” RAM pack. Battery backup, reset switch, PROM/ROM socket. Timex/Sinclair 1000
UM-64 64K RAM Pack 64K RAM pack with additional features. 8-16K area selectable in 2K increments. EPROM socket for 2K/4K. Battery backup (6 AA batteries) powers RAM pack and computer for up to 30 minutes. ROM-RAM transfer: copy Timex ROM into the 0-8K area of RAM, flip a switch and operate out of RAM. Switch that only resets 16-32K Timex/Sinclair 1000

Books

Periodicals

Downloads

Name Description Computers
Parallel 1000 Timex/Sinclair 1000
SpectraTERM 1.0 Timex/Sinclair 2068
SpectraTerm 1.30 Timex/Sinclair 2068
ZComm Terminal software for the ZX81/TS1000 for use with the Byte-Back MD2 modem. Timex/Sinclair 1000

Articles

Title Description Computers
A Modem for the Timex 1000 or ZX-81 Review of Byte-Back modem. Timex/Sinclair 1000
Add a Full Size Printer to Your System Overview of printer interface options for the TS1000/ZX81. Sinclair ZX81, Timex/Sinclair 1000
An inexpensive computer and interface for research in the behavioral sciences The Sinclair ZX81 computer and Byte-Back BB-1 control module are very inexpensive devices that can be used to control equipment in a psychology laboratory. A simple program and description for interfacing the system to a Skinner box are presented. MicroAce, Sinclair ZX81
Analog-Digital Converter Use with the BB-1 I/O board. Converts at 2.5v and 5v to 8 bit values (0-255). Sinclair ZX81
Autotape Timex/Sinclair 1000
BB-1 8-Bit Input/Output Module Kit Two Intel 8212 8-bit I/O port chips are the heart of the BB-1. Byte-Back’s module is compatible with both ZX and Timex units and neatly uses memory locations 32764 and 32766 to store input and output information. Timex/Sinclair 1000
Bits & Bytes Timex/Sinclair 2068
Bits and Bytes
Bits and Bytes Timex Sinclair User has issued its first copy of Timex Sinclair Shopper. It is supposed to come out quarterly. In it there is a subscription form for Timex Sinclair News, the new name for Timex Sinclair User. The new owner of Timex Sinclair User worked with TS User and the former Timex Sinclair User became Timex/Sinclair 2068
Bits and Bytes Timex Sinclair User is dead; subscriptions will be filled with issues of K-Power. Timex/Sinclair 2068
Bits and Bytes
Byte Back MD-2 Modem Kit Timex/Sinclair 1000
Byte-Back M-64 Memory Expansion Review of the RAM pack. Timex/Sinclair 1000
Byte-Back Modem Timex/Sinclair 1000
Byte-Back Modem Shipments Delayed Byte-Back will ship no modems for 4-6 weeks.
Byte-Back RS-232 and Tasword Two Timex/Sinclair 2068
Compatibility of Machines Compatibility of hardware with the TS1500 and TS2068. Timex/Sinclair 1000, Timex/Sinclair 1500, Timex/Sinclair 2068
Dear Editor Battery-backed power; errors in printing floating point numbers; using VU-File with Qsave; Sinclair microdrive; overload the TS1000 stack with a simple program; good service from a vendor; thanks to fellow reader; Byte-Back RAM unit.
Experimenting With the Byte Back Modem How to program modem settings with the TS1000. Timex/Sinclair 1000
For Your Support Hardware and software announcements from many vendors. Timex/Sinclair 1000, Timex/Sinclair 2068
For Your Support Product announcements from G. Russell Electronics, Byte-Back, Variety Sales, Chia-Chi Chao, Larken Electronics, Sams, Fred Nachbaur, Lemke Software Development and E. Arthur Brown. Sinclair QL, Sinclair ZX81, Timex/Sinclair 1000, Timex/Sinclair 2068
Highlights of the February Meeting Sue Mahoney reported on public library in Sub Oak, NY, that lends TS-1000 computers. Mike Coughlin led discussion on FORTH. Peter Nichols demonstrated Byte-Back modem. Timex/Sinclair 1000
Highlights of the September Meeting Frank Kaplan from Compusa Corporation demonstrated a prototype of the FDC-101 floppy disk system. Jeff Parker demonstrated the Byte-Back MD1 and MD2 modems.
Key Support Operations Will Stay Announcements of support from SoftSync, Byte-Back, Microsync Services, Thomas B. Woods, Banta Software, Kopak. Timex will honor warranties.
M-16 Memory Module Review of the RAM pack. Timex/Sinclair 1000
MD-1 Direct-Connect Modem and RS-232 Port Review of Byte-Back’s modem. Timex/Sinclair 1000
MD-2 Modem Review of the Byte-Back modem for the TS1000. Timex/Sinclair 1000
Modem and Serial I/O Review of Byte-Back MD-1 modem. Timex/Sinclair 1000
New Products and Services (Syntax v5 n11) Tom Woods sells enhanced Mscript; Byte-Back offers new A/D converter; Tom Bent’s 8K ROM; Powerful Projects with Your Timex/Sinclair; D. Lipinski’s buyer’s guide; Spec-Tax; control your computer with brain waves; green screen monitors.
Product News Catalogs from Silicon Mountain Computers, Byte-Back, JRC Software. Service manuals from Sams Computerfact. RAMEX discontinues support for 2068 and Millenia K disk systems.
Q & A Byte-Back UM-64; One Chip Mods; “Delete” machine code.
Refining ZCOMM Timex/Sinclair 2068
Rumors and More
T-S News Midwest Timex-Sinclair Computerfest coming. Byte-Back still in business. AN-TO Productions carries line of plastic keyboard overlays for the TS2068, for use with Tasword and MScript. English Micro Connection carries Spectrum games. Zebra Systems selling TS1510 cartridge doc and three cartridges. Applied Sinclair: Subroutines and Programs for the Mathematically Inclined available from Richard Booth. Hacksel Electronics Timex/Sinclair 2068
T/S MODEMS Short article about modems available to TS users. Timex/Sinclair 1000, Timex/Sinclair 2068
Telecommunicating With Your Timex Describes accessing various online services with a TS1000 and Byte-Back MD-2 modem. Timex/Sinclair 1000
Telecommunication Notes Resolving issues with the 2050 modem when used with 2040 printer. Byte-Back keeping up with 2068 modem orders. Timex/Sinclair 2068
The Byte-Back MD-68 Modem Timex/Sinclair 2068
Timex Tips Tips for using the Byte-Back Modem with the TS 2068; calling machine code routines; using the OS-64 cartridge. Timex/Sinclair 2068
Tips on Buying Communications Software ZCOMM 16/64K, Byte-Back Modem, Spectra Term mentioned. Timex/Sinclair 1000, Timex/Sinclair 2068
TS-1000 I/O Board How a user interfaced his TS 1000 to his train layout with the Byte-Back BB-1 interface board. Timex/Sinclair 1000
Turning Your Sinclair-Timex into a Smart Terminal Review of Byte-Back MD-1 and MD-2 modems. Timex/Sinclair 1000
UM-64 Memory Module Using bigger memories creates opportunities for greater losses in a crash. Byte-Back’s battery-back-up scheme cuts this risk. You’ll also get the possibility to have your operating system in RAM (all but the characters), compatibility with the TS1500, switch-selectable banks in the 8-16K area, an EPROM socket you can switch-select into 8-16K, and reasonable documentation from Sinclair ZX81, Timex/Sinclair 1000
Using the Byte-Back Modem The Byte-Back modem is a fine device. It works well and actually does more than advertised. The instruction manual, on the other hand, in its attempt to furnish operating instructions, assembly instructions, and engineering data, is a bit sketchy. A description of the non-standard output on the RS232 board is not given nor is there Sinclair ZX80
Vendor Report Byte-Back has nearly cleared up its backlog of 2068 modem orders; Ray Kingsley of Sinware believes that some of you may have purchased bootleg copies of an early version of HOT-Z with a bug in it; allegation of Gladstone copying software. Timex/Sinclair 2068
Vendor Report and Notes Norris Electronics is out of business; Byte-Back memory units might not work with TS2040 printer. Frog Software is distributing May-June issue of Sinclair Computing.
What's In Store: Byte-Back Modem (Timex Sinclair 1000/1500) Timex/Sinclair 1000, Timex/Sinclair 1500

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