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 of the software that would run before will still run, but you must have at least 16K RAM. The machine will initialize with 1 or 2K RAM, because of the partial decoding in the machine. Programs will not run though.