John Bell

Articles (19)

TitleAuthor(s)PublicationDate
16K – Fitting it “Under the Hood”LISTing NewsletterNovember 1987
16K RAM Inside the ZX81
This article is adapted from one written by John Bell which appeared in the November 1987 issue of L.I.S.T. It...
John BellQZXJune 1990
A Broken 2068? Fix It Yourself!
Method for testing for and repairing bad RAM chips.
Time Designs MagazineJuly/August 1988
Big Keyboard 2068
Schematic for interfacing a keyboard to the expansion bus.
LISTing NewsletterNovember 1985
Build Your Own Surge Suppressor
Add MOVs to a power strip and make a surge suppressor.
T-S HorizonsMay/June 1985
Cassette Loading Hints for Timex ComputersLISTing NewsletterJune - August 1989
Cassette Loading Hints for Timex Computers
The most annoying problem I have had with my T/S 1000 is not being able to load programs, If you...
John BellT-S HorizonsDec 1984
Centronics Printer Port – AERCO Style
Schematic for a parallel printer interface using the Zilog Z80-A parallel input/output chip (PIO).
LISTing NewsletterNovember 1985
Gavilan Printer InterfaceLISTing NewsletterJanuary 1986
In Sync #2: User Defined Graphics for the 2068
As I promised last month, here is the listing for the UDG program. Since it is a rather long program,...
John BellT-S HorizonsApril 1985
In Sync: 2068 Line Renumber Routine
Renumbering routine for the 2068.
T-S HorizonsNovember 1984
In Sync: 2068 Screen-Save
When you are writing a Basic program it is often necessary to be able to swtich between two screens of...
T-S HorizonsFebruary/March 1986
In Sync: Effective Graphics on the TS 2068
Program to create a scrolling message ticker.
T-S HorizonsJuly/August 1985
In Sync: Exploring 2068 Video Modes
One of the reasons I bought a 2068 was to use the advanced video modes described in appendix C of...
T-S HorizonsMay/June 1986
In Sync: Linecheck
Linecheck generates checksums for programs, making it easier to ensure they are typed in correctly.
T-S HorizonsFebruary/March 1985
LettersLISTing NewsletterMarch 1991
Letters to LISTLISTing NewsletterMarch 1985
Number to Word
Convert a 7 digit phone number to all possible letter/number combinations.
T-S HorizonsMay/June 1985
Serial Port Driver
Using the 2050 modem board to drive a serial printer.
Time Designs MagazineJanuary/February 1988

Downloadable Files (3)

TitleTypeCompanyDownload
Program ChecksumProgramDownload
Triangle To SquareProgramDownload
Window PrintProgramZebra Systems, Inc.Download
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