The Sinclair QL Forum

Hi George and other readers,

I'm currently testing George's Dual floppy drive set I sold him, but as he said already, I can't find anything wrong with it.
Of course I will replace the set, but it would be a good thing to know why there are problems with his QL and Trump card.

I'm testing the Dual ...

It can, but my 'modern' cheap Chinese programmer has troubles with them old 'high-voltage' programmable chips.

It's hard to obtain a good universal programmer: it's either looking for a cheap one that supports the most old and new components, and accept that it has some minor flaws (like with 27xxx ...

Great, thanks!

I read that the Minerva ROM can also be used externally, but the internal ROMs should be removed.
Isn't there any way to disable the internal ROMs by external circuitry on the ROM port?

I have to start investigating the schematics myself of course.
I just can't believe at the ZX ...

29C010 must be usable, but has 4 more pins.
This is not a real problem as the Minerva ROM is already on a pcb, so I will focus on the 29C010.
Time to order some.

I'm new to QL (but not new to Sinclair: http://www.ByteDelight.com ), and digging into QL enhancements and add-ons.

I fixed my QL yesterday with the help of a Minerva ROM I borrowed.
Now I want to clone this ROM, and as I always do, I immediately think of how to make 10 or more for others too.

So ...

Hey guys, this my first post here.
I bought the QL from Rich (had some QL's in the past, but never did something with them) to test some add-on cards I had recently obtained, and because I may produce QL hardware in the future.

But unfortunately it had a small defect.
I think it was caused by a bad ...