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On August 5th, 2018 Uwe Geiken posted a programming excercise in the Facebook group ‘BASIC on the ZX Spectrum’. The challenge had to do with something called the “Kaprekar’s Constant”. I had never heard of it before this post appeared in the group. Never too old to learn something new…

The post linked to a Wikipedia article about the Kaprekar’s Constant. The article lists the following properties for the constant (6174);

After posting the last article on refurbishing the ZX Spectrum I got a tip from Alex (a.k.a. ZX Wife) via Twitter on what I could try to resolve the issue with the keyboard as soon as the case was completely screwed down. Together with Ian she forms the team behind Mutant Caterpillar.

https://twitter.com/zx_wife/status/1010155645386022914

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All the parts required to finish refurbishing the ZX Spectrum 48K (upgraded from a 16K model) have been delivered, so time to start working on the unit again.

To complete this unit I will be performing the following tasks

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