Search found 1322 matches

by Pr0f
Sun May 19, 2024 11:06 pm
Forum: QL Emulation
Topic: A small QL
Replies: 48
Views: 8881

Re: A small QL

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!
by Pr0f
Sun May 19, 2024 6:11 pm
Forum: QL Emulation
Topic: A small QL
Replies: 48
Views: 8881

Re: A small QL

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...
by Pr0f
Sun May 19, 2024 2:22 pm
Forum: General QL Chat
Topic: Anouncement for the 40th Anniversary of the Sinclair QL in Dormagen (Germany)
Replies: 40
Views: 6581

Re: Anouncement for the 40th Anniversary of the Sinclair QL in Dormagen (Germany)

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...
by Pr0f
Sat May 18, 2024 7:49 am
Forum: Hardware
Topic: CPLD replacement for ZX8301
Replies: 237
Views: 57942

Re: CPLD replacement for ZX8301

Excellent news!
by Pr0f
Thu May 16, 2024 11:30 am
Forum: The Off-Topic Section
Topic: Z88 power supply
Replies: 11
Views: 315

Re: Z88 power supply

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...
by Pr0f
Wed May 15, 2024 1:57 pm
Forum: The Off-Topic Section
Topic: Z88 power supply
Replies: 11
Views: 315

Re: Z88 power supply

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...
by Pr0f
Sun May 12, 2024 9:28 pm
Forum: Hardware
Topic: CST Ram Plus eproms - CST QDisc v4 issue
Replies: 20
Views: 1072

Re: CST Ram Plus eproms - CST QDisc v4 issue

a 32K ROM image would usually just have 2 16K images in it - one at the start and one on the 16K boundary
by Pr0f
Fri May 03, 2024 6:23 pm
Forum: Hardware
Topic: CST Ram Plus eproms - CST QDisc v4 issue
Replies: 20
Views: 1072

Re: CST Ram Plus eproms - CST QDisc v4 issue

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.
by Pr0f
Thu May 02, 2024 6:43 pm
Forum: Software & Programming
Topic: Plug-in ROM without $4AFB0001 Header
Replies: 14
Views: 734

Re: Plug-in ROM without $4AFB0001 Header

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.
by Pr0f
Wed May 01, 2024 5:34 pm
Forum: Hardware
Topic: CST Ram Plus eproms - CST QDisc v4 issue
Replies: 20
Views: 1072

Re: CST Ram Plus eproms - CST QDisc v4 issue

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.