Merlin's Technical Blog

Every so often, I come across something interesting and would like to be able to share it. Facebook doesn't seem the right platform for this sort of thing, somehow. I am often surprised at the level of interest in my tinkerings. Perhaps you will find something you like!

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Thursday, 24 November 2022

Bitcoin Mining on a Z80

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The Bitcoin cryptocurrency makes extensive use of the SHA-256 hash function. This hash function (in common with many others) takes a block...
Wednesday, 9 November 2022

CP/M File System Checker (fsck)

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CP/M 2.2 is a very interesting historic operating system. Though very small (approximately 3.6 KB), it manages to achieve quite a lot in thi...
Thursday, 3 November 2022

ZARC, the Z80 Anachronistic Retro Computer

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I have hinted at my homebrew Z80 project called ZARC before, for example my post about Greedy Gulch . ZARC is now essentially complete, in a...
Saturday, 22 October 2022

ELF Mini-Terminal Video Fix

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The ELF mini-terminal developed a rather odd fault. The cursor disappeared and reverse video did not work. The CRT alignment test screen lo...
Thursday, 18 August 2022

ELF Mini-Terminal Keyboard Debouncing Fix

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Though the terminal described in a previous post does work, it suffered frequent keyboard bounce. This means that when you press a key, inst...
Monday, 15 August 2022

Sennheiser EW100 G2 Repair

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We use these Lavalier microphone transmitters with the PA in my local church. They are generally well constructed, and I have not had to ope...
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Sunday, 14 August 2022

Telex Model 530 Cordless Headphone

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I look after the PA for my local church. As with most such systems, it includes an inductive loop system. This is fundamentally quite simple...
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