Sinclair QL: Part 2 (Troubleshooting Begins)

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Australia The Clueless Engineer
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Published on ● Video Link: https://www.youtube.com/watch?v=MRU7lu0ETGs


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The replacement keyboard membrane and some apparently re-felted Microdrive cartridges have arrived so it's time to look at this fellow again.

I replaced the membrane pretty easily but it still boots to a white (well, grey IMHO) screen ... I had thought maybe I had to press f1 or f2. There is also no activity on the Microdrives that I could see.

Pressing the [RESET] button still elicits a key typing noise, so something seems to be working.

The machine came with the "JM" version of the Sinclair QL ROM which appears to be the penultimate version from Sinclair (followed by "JS"):
https://dilwyn.qlforum.co.uk/qlrom/index.html

I tried installing the Minerva 1.98 (with QLAN I/O fix) by splitting the 48KB ROM into 32KB (for a 27256) and 16KB (for a 27128).
http://tfs.firshman.co.uk/ql/fminerva.htm

I am now greeted with a multicoloured screen of garbage, but the Microdrives also spin up.

So some further troubleshooting is required, including a proper look at the DRAM chips ... yay, possible de-soldering required.



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