Tag Archives: Circuit

You’re just Multi-faced

A lot has been going on lately so I thought I’d update the blog with some of it. Starting with a small announcement. I secured the domain www.ProjectSPECCY.com It currently re-directs here. I am unsure as yet whether I will … Continue reading

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Refurbishing a 48K Rubber Keyed Sinclair ZX Spectrum – Pt.5 Case Cosmetics

Now the Spectrum’s board was fully refurbed and tested working, it was time to turn my attention to the case, keyboard and fascia. The original fascia looked a little tired and was dented so I had ordered a replacement from … Continue reading

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Refurbishing a 48K Rubber Keyed Sinclair ZX Spectrum – Pt.4 Custom Composite Video Mod

Now I had the Spectrum PCB fully working, I wanted to add a Composite Video modification to round off all the refurbishments. I had already used a neat circuit advised by Andrew Gostling when I repaired a previous machine. Although … Continue reading

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Refurbishing a 48K Rubber Keyed Sinclair ZX Spectrum – Pt.3 Upper RAM Replacement

As I had assertained earlier, the 48K Rubber Key Spectrum I was refurbishing required it’s Upper RAM to be repaired. Since the chips inside of the machine were old, I elected to replace them with a complete Upper RAM Module. … Continue reading

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Diagnosing 48K Spectrum Upper RAM Faults

By way of a break from the refurb posts; I was recently part of a conversation on FaceBook regardig a coulple of 48K Rubber Key Sinclair Spectrums. Both were proved to have faulty Upper RAM problems by issuing the command … Continue reading

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Refurbishing a 48K Rubber Keyed Sinclair ZX Spectrum – Pt.2 Replacing the Regulator

The poor 7805 in any Sinclair Spectrum always works really hard. It was probably the best solution when the machine was designed but things have moved on. Switch-mode technology has improved and reduced in size. Therefore, when refurbishing any Sinclair … Continue reading

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EPROM Info Table

One of the other things I am involved in is graphics. I have had this table knocking about on my hard drive for a while: It’s available from several sources and I find it very useful. Search as I might, … Continue reading

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Spectrum Next Kickstarter Active!

After what seems a very long wait, the Spectrum Next Kickstarter campaign has started. This machine promises to be everything the retro-computing fan would need. A very well ‘speced’ machine (pardon the pun) with active development, a thriving community and … Continue reading

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YouTube Channel

I’ve been setting up equipment to start a ProjectAVR YouTube channel for a while. Almost there now. Just a few more pieces of the jigsaw to put in place. In the mean time, I’ve been learning about video editing and … Continue reading

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KiCad

KiCad is an EDA program, similar to Eagle, Altium and the like. I last tried it some years ago and found it to be very difficult to use, not least because of the inevitable steep learning curve that all CAD … Continue reading

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