The Sinclair QL Forum

Interesting. The data sheet for the NEC drive says it wants 12Volts


It's actually 5V only- I have a few Miracle Systems double drive boxes with two FD1037As each. Internal PSU only puts out +5 and uses two pin connectors to the drives. One of mine had a bad PSU (damaged transformer), so I ended ...

Kind of reminds me of a NEC FD1139T as well, except the NEC doesn't have the stepper motor on the back. (Used linear voice coil, no really.)

Thank you, Martin! I was hoping that someone would be able to add some more context around those snippets of code.


I am currently going through QLib_run_asm trying to add comments

This is what I have for these areas

Involves FOR loops.


I am mostly working on the initialisation stuff at the ...

I've been doing a bit of digging into this, mainly out of curiosity since I recently received a QXL...

There are some "interesting" sequences of code in qlib_run_asm:

Here we seem to be testing bit 30 of a pointer in A3 (I apologize for not understanding the context of this in the least, but that ...

I suspect it doesn't need any of the funky timing for RAS / CAS that the original GAL's use to provide.

But was the trick to relocate the ROM used I wonder? (needed for non Minverva versions of QDOS)


This is the correct answer, no more RAS/CAS timing logic. And yes, the ROM relocation logic is ...

Hi Techfury,

Thanks for the info! I have already ordered the components. And I have two spare WD1772 at hand.
I assume these work just as well as the WD1770?
Instead of the GAL I will try to make it work with an ATF16V8B. Those are still being made and sold.
I might redraw the board so the card ...

Thanks techfury


No problem!

Sorry this took a whole day to sort out, but the long story short is that the hosting provider decided to block outgoing SMTP (even on ports 465/587) to external servers about a week and a half ago, and didn't tell us.

Unfortunately, I spent a whole day going ...

It does seem that email notifications seem a bit broken at the moment, thanks for letting us know. I'll dig into this right now and see what's going on.

It does get fairly warm but it is not too hot to keep your finger on. There's a copper fill underneath the 7805 to help reduce the heat- I've found it does a great job of keeping the warmth confined to that single corner.

As far as power reduction, here's some quick "back of the envelope" math ...

Right here. Self-deprecating humor is allowed.