Search found 1075 matches

by Peter
Wed Sep 16, 2020 10:19 am
Forum: The Off-Topic Section
Topic: ZX Spectrum Next Kickstarter 2 just launched
Replies: 34
Views: 2356

Re: ZX Spectrum Next Kickstarter 2 just launched

From what I've read on the Speccy next forums, they won't be getting any significant economies of scale at these relatively small volumes. I would say medium, not small. And huge in QL scales. If I guessed correctly, it could be a manufaturing run of about 5000 machines, which is 200 times more tha...
by Peter
Tue Sep 15, 2020 2:16 pm
Forum: Hardware
Topic: Target for major new QL hardware
Replies: 46
Views: 3496

Re: Target for major new QL hardware

Pr0f wrote:I would probably start with an existing PS/2 keyboard and see if the micro in it could work with the QL matrix as it already does the job of scanning keys.

Especially if you have the sourcecode, that sounds like a good idea. Or get in touch with those QLers who already worked on similar projects.
by Peter
Tue Sep 15, 2020 11:06 am
Forum: Hardware
Topic: Target for major new QL hardware
Replies: 46
Views: 3496

Re: Target for major new QL hardware

Pr0f wrote:What's actually required for the Q68 to use the QL keyboard?

Just a little PCB with a microcontroller as you anticipated. I heard of QL matrix to PS/2 projects, but no sign of completion for about two years...
by Peter
Tue Sep 15, 2020 10:32 am
Forum: General QL Chat
Topic: Faster CPU plug in extensions, How?
Replies: 27
Views: 1118

Re: Faster CPU plug in extensions, How?

Converting the QL emulator to a "Bare Metal" emulator is another totally difference problem. Which I mean, the C code must be re-written in ARM assembly code, which I do not see many people in the RPi world interested in ARM assembler. It could still be in C, but once you go "bare me...
by Peter
Tue Sep 15, 2020 10:01 am
Forum: Hardware
Topic: Target for major new QL hardware
Replies: 46
Views: 3496

Re: Target for major new QL hardware

Derek_Stewart wrote:I do not think that soldering 24 pins is any extra work load and the cost of the connector is miminal.

You are right, it was my mistake not to recommend soldering it from the start.
by Peter
Tue Sep 15, 2020 10:00 am
Forum: Hardware
Topic: Target for major new QL hardware
Replies: 46
Views: 3496

Re: Target for major new QL hardware

At 2cm to the depth and 3 cm width, put the PS/2 on the back (where the dongle will be less bothersome) and move the expansion port to the left edge and duplicate it and I give you my solemn word I'll release two expansions for the Q68 II within a month. A floppy interface using the DP8473, and an ...
by Peter
Tue Sep 15, 2020 8:55 am
Forum: Hardware
Topic: Target for major new QL hardware
Replies: 46
Views: 3496

Re: Target for major new QL hardware

I heard lots of talk of Q68 expansions, but nothing has ever come to fruition. Do they exist or is just or is this just waffle... I know of some that exist but are private hobby projects. I have to be self-critical here as I was too lazy to document the Q68 extension bus timings yet. Also I made th...
by Peter
Tue Sep 15, 2020 8:30 am
Forum: General QL Chat
Topic: Faster CPU plug in extensions, How?
Replies: 27
Views: 1118

Re: Faster CPU plug in extensions, How?

I hear what you are saying from your experience but I don't understand how an 800 MHz cpu can't keep up with an 8 MHz and not sure what MMIO has to do with it? There might be a problem with the number of IO lines on the RPi but a speed problem. Firstly, the RPi GPIO, SPI etc. are unproportionally s...
by Peter
Mon Sep 14, 2020 11:37 pm
Forum: Hardware
Topic: Target for major new QL hardware
Replies: 46
Views: 3496

Re: Target for major new QL hardware

So, you said the Q68 was made small because you dislike wasted board space. Yes and I don't even consider it very small. And now you're saying the Q Zero doesn't have a feature because it would take too much board space. :P Absolutely. The Qzero is a miniaturized tinkering board, unlike the Q68 whi...
by Peter
Mon Sep 14, 2020 10:25 pm
Forum: Hardware
Topic: Target for major new QL hardware
Replies: 46
Views: 3496

Re: Target for major new QL hardware

The Qzero has hobbled graphics, though, which reduces the benefit. Give it full Q68 graphics and that becomes much more compelling. Via HDMI it has full Q68 graphics. I only reduced DAC width for VGA. To save space without need to handsolder 0204 resistors. One of the very few issues with daily use...