ZX Spectrum 128K composite video fixes in 1 document 
Thursday, January 26, 2012, 08:47 PM
I created a document with video fixes and improvements and video cables for all ZX Spectrum 128K models.

Click here for the document.
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Hires Opus Discovery board pictures 
Thursday, December 1, 2011, 12:38 PM
As I had the rare and awesome opportunity to be able to buy 5 or 6 Opus Discovery interfaces this year, and because I couldn't find hires pics of the board on Google, I thought it was time to upload some myself.

Here's a video in which I'm dissassembling a floppydrive from an Opus because I forgot to set the driveselect correctly:

Here they are pics (click for hires):

Some problems I had to repair with these Opus Discovery interfaces were:
- defective rectifier
- defective ROM
- one didn't have a 6116 ram chip, don't know if it is needed, but I ordered one anyway
- one had a defective WD1770 floppy controller; replaced it with a WD1772 from an Atari ST: another model but pincompatible, and that worked great!
- one floppydrive failed, but luckally that Opus had two! Only needed to make a bracket to cover the space
- the soldered wires on the 'flying' LM317's come off easily with some movement: very frustrating when you are repairing an interface...

I encountered these interesting things:
- two had a rom v2.2 (one even had a paper with rom changes, but I didn't scan it, sorry!); the lowest rom version I found was 2.1, probably the default factory-rom
- I had one large filled floppybox with about 40 floppies filled with data; very rare to have owned as all others had only one or two or no floppies at all
- there are some different ways of how the voltage regulators are mounted
- there are some different board versions, haven't checked for numbers

This seems a lot of trouble, but believe me: ZX Spectrums fail a lot more and at a lot of more parts.

All together the Opus Discovery is a very solid system, which still works after so many years!
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Stereo sound enhancement for any 128K ZX Spectrum model available 
Thursday, September 22, 2011, 08:16 PM
I just opened a new topic on World of Spectrum (click here) with info about ordering the new stereo sound enhancement.

It's a complete kit including stereo audio output socket and switch to choose between ABC and ACB sound.
All is explained in this manual (click here).

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Nostalgia in it's best way! 
Saturday, November 27, 2010, 08:11 PM
I was able to harvest these wonderful items from my attic and some recent boughts:

So this is how Clive ment computing!
Nice and fun, but I'm happy I also joined the modern pc community ;)

(unfortunately not all components are working; the interface one and two however, including the Cookie rom, do!!")
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My 8-bit kids 
Sunday, November 14, 2010, 01:25 PM

(Created with BMP2SCR_EXP)
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