David Ornstein

Articles (27)

TitleAuthor(s)PublicationDate
Dear Editor
Letters asking about Canadian suppliers; problems entering programs; interference on TVs; tape recorders.
SyntaxJanuary 1981
Firstloader — From ZX/TS to 2068
Syntax commissioned a custom program, written by David Ornstein, to convert your existing programs for the 2068 or 48K Spectrums....
SyntaxDecember 1983
Letters: More Memory for the ZX80
Correction to article about expanding ZX80 RAM. Notes on getting ZX80 to recognize 48K.
ByteJune 1982
Loading Hexadecimal Listings
This program converts the hex and stores it into a space explicitly for it.
SyntaxJune 1982
New 8K ROM Potpourri
Sinclair’s first 8K ROM had a few bugs; list of changes to the 8K ROM map.
SyntaxNovember 1981
New 8K ROM Routine Addresses
Here are the starting addresses for routines in the corrected 8K ROM. All addresses are hex.
SyntaxJanuary 1982
Note on copyright; REM skips next line
REM statements with copyright notices do constitute legal protection; a blank REM causes the interpreter to skip next line.
SyntaxMarch 1981
Perceptions
SYNCSUM is a method of checking whether you have entered the program correctly. If you are submitting an article, we...
SYNCJuly/August 1981
Perceptions
A ROM Munching Session; Video Sync Signals; Video Modulator Drive Circuitry; Loading.
SYNCSeptember/October 1981
Perceptions
Conversions: 4K ROM to 8K ROM and 8K ROM to 4K ROM
SYNCNovember/December 1981
Perceptions
4K and 8K ROM Command Conversions 4K and 8KROM Command Conversions In the last issue of SYNC (1 :6) I...
SYNCJanuary/February 1982
Perceptions
In this issue I will discuss the ZX80/81’s display system. The ZX80/81 video display is created almost entirely by software....
SYNCMarch/April 1982
Perceptions
The ZX81 Parser and User-Defined Commands; More on the 16K RAM Pack Schematic; Addenda to “The ZX80/81 Video Display System.”
SYNCMay/June 1982
Perceptions
The ZX81 Parser (Part 2). In the last issue I began a discussion of the ZX81’s parser which is a...
SYNCJuly/August 1982
Perceptions
This article is the third in a series discussing the ZX81 Parser. Since the first two articles may have been...
SYNCSeptember/October 1982
Perceptions
In this issue Perceptions will take up I/O (Input/Output) ports. The fundamental issues are discussed, and a sample method for...
SYNCJuly/August 1983
Perceptions
Overview The TS2000 series of computers claims an extensive group of features of hardware and software. The machines feature 24K...
SYNCSeptember/October 1983
Perceptions: Syncsums
Short program to provide checksums to users as they type in programs, to ensure they’ve been entered correctly.
SYNCSpecial Issue 1982
SQ-UP
In David Ornstein’s premier issue article (SQ Winter 82 p. 29) Using Extra Keys on Big Keyboard, add a symbol...
SyntaxNovember 1983
The ZX80 and ZX81 in the USA
Background about Sinclair Research Ltd., its entry into the United States marketplace, and its first two computers.
ZXzineAugust 2015
The ZX80 KeyboardLISTing NewsletterJuly - August 1994
Using Extra Keys on Big Keyboard – A Simpler Approach
Connections to map a single key to replace two keystrokes.
SQ Syntax QuarterlyWinter 1982
Video Modifications for the ZX80
Inverted and direct video.
SYNCMarch/April 1981
Video Modifications for the ZX80LISTing NewsletterJuly - August 1994
Window
A machine language monitor is a utility, provided by most computer systems, which aids in the development of machine language...
SYNCSpecial Issue 1982
Window
A machine language monitor is a utility, provided by most computer systems, which aids in the development of machine language...
SYNCJanuary/February 1982
ZX81 and 16K RAM Schematics
A new company, Heuristics, is the exclusive distributor of ZX81 and 16K RAM pack schematics. They also plan ZX81 hardware...
SyntaxNovember 1981

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