RB-ZX ROM Board
Modular interface that maps a ROM to several locations in memory.
Sinclair ZX81
Sinclair ZX81 8K ROM Upgrade manual
Here is the eprom upgrade for your operating system. Version 10 is the current issue. Several revisions have been made to both “fix” and improve the Sinclair BASIC operating system, I’m quite sure that all of the changes will delight you. You will probably forget that it is installed in a few short days. ALL
Sinclair ZX81 8K ROM Upgrade manual Read More »
ZX81/TS1000 Software Rating
Numeric rating of several software titles.
ZX81/TS1000 Software Rating Read More »
Mastering Machine Code on your ZX81
Review of the book.
Mastering Machine Code on your ZX81 Read More »
Restart without Reload
Use the WAIT signal to restart a ZX81/TS1000.
Restart without Reload Read More »
How I Made My Fullsize Keyboard
Describes how to connect a surplus keyboard to a ZX81.
How I Made My Fullsize Keyboard Read More »