The Sinclair QL Forum

those current draws are favourable. Letterbox - just that a keyboard and LCD screen combo may be a good way to do this - as it's one single case to make - no hinges. The letterbox LCD screens are available with HDMI input - but the resolutions are a bit strange - they are usually 400x1280 or 480x192...

Thoughts from the 40th QL Celebration. It was a late decision for me to attend the 40th Anniversary celebration in Dormagen, but I am glad that I did make that decision. Having been in and out QL ownership over most of those years, but strangely always having a couple of Sinclair products in my hous...

I've used 7V without a problem, not sure about 7.5V - It is dropped by one diode forward voltage (about 0.6-0.7 vols), and feeds the circuit that would normally see the 6V from the batteries. Very fresh batteries could provide close to 1.6V each - giving a voltage of 6.4 against the 6.9 you would se...

The Z88 does have it's own rather clever little power supply that can produce a bit of high pitch wine when operating - usually caused by the small ferrite transformer / inductor on the board being a tiny bit loose. Sometimes a small blob of silicon sealant on it can anchor it to the PCB sufficientl...

I think you've done a great job getting the q68's out to so many Derek, it's attracted a good few people back to the QL scene!

I got one of those kits to see what the dev tools were like. It seems there are a good few design constraints on the pins, so what looks like a lot of pins soon gets eaten up with the dev board resources. I've seen the 20k used to define the Yamaha MSX2 chip, but Peter gets a video controller, a mem...

Thanks Martin, I echo your sentiments about the organisation at relatively short notice, and putting faces to many contributors I see posting on this forum. It was an excellent weekend and I even managed to avoid the bad weather. I will post something more complete tomorrow when I am on a computer r...

Excellent news!

I've done this on a couple of machines now, it's a worthwhile modification, but depending how you do it, it could mean cutting tracks. I also replaced the super cap with a larger value one, along with lower power memory devices, this extends the battery replace time and battery life, as the old supe...

I'd err on the higher voltage side - the Sinclair PSU puts out about 6.5V, but 7.0 or 7.5 Volt, but the polarity is important! There is NO protection in the Z88 for reverse polarity - so check the documentation. From memory (and please don't rely on this info) it's the opposite of most common suppli...