Search found 2501 matches

by Dave
Mon Sep 14, 2020 10:20 pm
Forum: General QL Chat
Topic: Faster CPU plug in extensions, How?
Replies: 27
Views: 1174

Re: Faster CPU plug in extensions, How?

This is a lot more complex than it sounds. I've played a lot with replacement CPUs in the QL, with mixed success. Here's what I can tell you. Using a CPU of a different architecture is 100% doable at 7.5MHz However, I think OP is thinking about 68K processors. Nope :lol: It was an interesting read ...
by Dave
Mon Sep 14, 2020 10:06 pm
Forum: Hardware
Topic: Target for major new QL hardware
Replies: 46
Views: 3594

Re: Target for major new QL hardware

A slightly larger FPGA - to enable a separate bus for video memory so large screen sizes do not slow the entire machine Already routed and tested as part of the Qzero. Whether slightly larger or several 100% larger just a matter of target price. [/quote] The Qzero has hobbled graphics, though, whic...
by Dave
Mon Sep 14, 2020 7:22 pm
Forum: Hardware
Topic: Target for major new QL hardware
Replies: 46
Views: 3594

Re: Target for major new QL hardware

I think everything 'major' has been done. Every 68K from '000 to '060 has been used. Extended video exists. The Q68 is present and correct - it just needs to come down in price. So for me the next step is a Q68 II. Simple (I can here Peter laughing from here!) changes like: A slightly larger FPGA - ...
by Dave
Mon Sep 14, 2020 7:04 pm
Forum: General QL Chat
Topic: Faster CPU plug in extensions, How?
Replies: 27
Views: 1174

Re: Faster CPU plug in extensions, How?

This is a lot more complex than it sounds. I've played a lot with replacement CPUs in the QL, with mixed success. Here's what I can tell you. Using a CPU of a different architecture is 100% doable at 7.5MHz, if you're into the idea of writing your own OS that uses all the QL's pre-defined IO address...
by Dave
Sun Sep 06, 2020 2:10 am
Forum: Hardware
Topic: Open source Floppy controller and Eprom programmer
Replies: 9
Views: 1010

Re: Open source Floppy controller and Eprom programmer

Can you publish all the Sandy hardware designs under the appropriate licence. Doing this will make all the hard work that Sandy did, not be lost. I only bought certain rights. The Futura design, the QXT-640 and anything licensed from SPEM are not covered. Nor is any standalone software, including a...
by Dave
Sat Sep 05, 2020 10:13 pm
Forum: Hardware
Topic: Open source Floppy controller and Eprom programmer
Replies: 9
Views: 1010

Re: Open source Floppy controller and Eprom programmer

I hereby give permission, in perpetuity, for the SuperQBoard schematics and layout to be released under the GPL V2 and/or V3 license. I obtained the rights to the hardware, but not whole driver, in 2004, from Tony Ianiri. Those parts of the driver code I did have rights to were not produced by Sandy...
by Dave
Sun Aug 16, 2020 8:20 pm
Forum: Hardware
Topic: Issue Tx boards discussions
Replies: 61
Views: 8085

Re: Issue Tx boards discussions

Two rows have parallel connection, because of different connectors have 2.54 or 5.08 mm between rows. Modern connectors - 5.08mm, but old QL connector - 2.54. This was exactly my experience too. I had to put a second row of contacts in for the same reason. How come the DRAM didn't change from 64Kx1...
by Dave
Sat Aug 15, 2020 11:18 pm
Forum: Hardware
Topic: QL-SD
Replies: 62
Views: 5776

Re: QL-SD

It's so exciting to drop in and see so many exciting developments. Between Peter, you and Tetroid, everything is covered.
by Dave
Fri Aug 14, 2020 7:09 pm
Forum: Hardware
Topic: QL-SD
Replies: 62
Views: 5776

Re: QL-SD

Ooooh. Someone slipped a 512K flash chip on there. Sneaky!
by Dave
Tue Aug 11, 2020 4:48 pm
Forum: Hardware
Topic: Power supply
Replies: 9
Views: 783

Re: Power supply

In the QL, the AC feed is immediately rectified into DC. This derives +12V and -12V. The DC feed is immediately regulated to 5V for running the system. There's nothing in the QL that relies on the AC frequency. A QL will happily work on AC from about 38 Hz up to around 225-260Hz without problems. Ch...