The Sinclair QL Forum

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...

a 32K ROM image would usually just have 2 16K images in it - one at the start and one on the 16K boundary

I think the eprom sockets decode out as 32K chunks - so you can get 2 16K ROM images per 27256 Eprom.

Not sure you'd be able to get ICE to work - I am sure I've read somewhere that it expects to be at 0C000 (ROM Socket) in the QL memory map and may not work if located elsewhere.

Is the ROM in a cartridge? If so - that header should be there, but if you are reading the ROM chip outside of the cartridge - it's just possible that the address and or data lines are not in order on the ROM chip but are on the interface itself - if that makes sense.

Most of the "Rommable" toolkits can be put into Eprom - I am not sure what address they appear at in the QL memory map though.